Vulnerability-Lookup

BDU:2026-06106 (CVE-2025-39726)

Vulnerability from fstec – Published: 2026-04-29 – Updated: 2026-04-29 – View on bdu.fstec.ru Fixed

Title

Уязвимость функций ism_cmd() и ism_probe() в модуле drivers/s390/net/ism_drv.c драйвера сети на платформе S390 ядра операционной системы Linux, позволяющая нарушителю вызвать отказ в обслуживании

Summary

Уязвимость функций ism_cmd() и ism_probe() в модуле drivers/s390/net/ism_drv.c драйвера сети на платформе S390 ядра операционной системы Linux связана с ошибками управления состоянием. Эксплуатация уязвимости может позволить нарушителю вызвать отказ в обслуживании

Severity

3.8 (Low) CVSS 2.0


                      
                        AV:L/AC:H/Au:S/C:N/I:N/A:C

4.7 (Medium) CVSS 3.1


                      
                        CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Class

Code vulnerability

Status

Confirmed by the vendor

Exploitation

Timing and state manipulation

Incidents

Being clarified

Remediation

Software update

CWE

CWE-362 - Одновременное выполнение с использованием общего ресурса с неправильной синхронизацией («Ситуация гонки»)
CWE-371 - Проблемы управления состоянием

Aliases

CVE-2025-39726

References

13 references

URL
https://git.kernel.org/stable/c/faf44487dfc80817f178dc8de7a0b73f960d019b
https://git.kernel.org/stable/c/1194ad0d44d66b273a02a3a22882dc863a68d764
https://git.kernel.org/stable/c/fafaa4982bedb5532f5952000f714a3e63023f40
https://www.cve.org/CVERecord?id=CVE-2025-39726
https://git.kernel.org/linus/897e8601b9cff1d054cdd53047f568b0e1995726
https://ubuntu.com/security/notices/USN-7879-1
https://ubuntu.com/security/notices/USN-7879-2
https://ubuntu.com/security/notices/USN-7880-1
https://ubuntu.com/security/notices/USN-7879-3
https://kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6.101
https://kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.12.41
https://kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.15.9
https://access.redhat.com/security/cve/cve-2025-39726

Impacted products

5 products from 5 vendors

Vendors

Red Hat, Inc., Canonical Ltd., Сообщество свободного программного обеспечения, АО «СберТех»

Products

Red Hat Enterprise Linux, Ubuntu, Debian GNU/Linux, Linux, Platform V SberLinux OS Server (запись в едином реестре российских программ №18785)

Versions

8 (Red Hat Enterprise Linux), 9 (Red Hat Enterprise Linux), 24.04 LTS (Ubuntu), 13 (Debian GNU/Linux), от 4.19 до 6.6.100 включительно (Linux), от 6.7 до 6.12.40 включительно (Linux), от 6.13 до 6.15.8 включительно (Linux), до 9.2.0-fstec (Platform V SberLinux OS Server)

Product types

Operating system

Platforms

Red Hat, Inc. Red Hat Enterprise Linux 8, Inc. Red Hat Enterprise Linux 9, Canonical Ltd. Ubuntu 24.04 LTS, Сообщество свободного программного обеспечения Debian GNU/Linux 13, Сообщество свободного программного обеспечения Linux от 4.19 до 6.6.100 включительно, Сообщество свободного программного обеспечения Linux от 6.7 до 6.12.40 включительно, Сообщество свободного программного обеспечения Linux от 6.13 до 6.15.8 включительно, АО «СберТех» Platform V SberLinux OS Server до 9.2.0-fstec (запись в едином реестре российских программ №18785)

Mitigations

В условиях отсутствия обновлений безопасности от производителя рекомендуется придерживаться "Рекомендаций по безопасной настройке операционных систем LINUX", изложенных в методическом документе ФСТЭК России, утверждённом 25 декабря 2022 года. Использование рекомендаций: Для Linux: https://git.kernel.org/stable/c/faf44487dfc80817f178dc8de7a0b73f960d019b https://git.kernel.org/stable/c/1194ad0d44d66b273a02a3a22882dc863a68d764 https://git.kernel.org/stable/c/fafaa4982bedb5532f5952000f714a3e63023f40 https://git.kernel.org/linus/897e8601b9cff1d054cdd53047f568b0e1995726 https://kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6.101 https://kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.12.41 https://kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.15.9 Для программных продуктов Red Hat Inc.: https://access.redhat.com/security/cve/cve-2025-39726 Для Debian GNU/Linux: https://security-tracker.debian.org/tracker/CVE-2025-39726 Для Ubuntu: https://ubuntu.com/security/notices/USN-7879-1 https://ubuntu.com/security/notices/USN-7879-2 https://ubuntu.com/security/notices/USN-7880-1 https://ubuntu.com/security/notices/USN-7879-3 Для Platform V SberLinux OS Server: Обновление операционной системы до версии 9.2.0-fstec или выше

JSON

To clipboard

{
  "CVSS 2.0": "AV:L/AC:H/Au:S/C:N/I:N/A:C",
  "CVSS 3.0": "AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "CVSS 4.0": null,
  "remediation_\u0418\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440": null,
  "remediation_\u041d\u0430\u0438\u043c\u0435\u043d\u043e\u0432\u0430\u043d\u0438\u0435": null,
  "\u0412\u0435\u043d\u0434\u043e\u0440 \u041f\u041e": "Red Hat, Inc., Canonical Ltd., \u0421\u043e\u043e\u0431\u0449\u0435\u0441\u0442\u0432\u043e \u0441\u0432\u043e\u0431\u043e\u0434\u043d\u043e\u0433\u043e \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e\u0433\u043e \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044f, \u0410\u041e \u00ab\u0421\u0431\u0435\u0440\u0422\u0435\u0445\u00bb",
  "\u0412\u0435\u0440\u0441\u0438\u044f \u041f\u041e": "8 (Red Hat Enterprise Linux), 9 (Red Hat Enterprise Linux), 24.04 LTS (Ubuntu), 13 (Debian GNU/Linux), \u043e\u0442 4.19 \u0434\u043e 6.6.100 \u0432\u043a\u043b\u044e\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u043e (Linux), \u043e\u0442 6.7 \u0434\u043e 6.12.40 \u0432\u043a\u043b\u044e\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u043e (Linux), \u043e\u0442 6.13 \u0434\u043e 6.15.8 \u0432\u043a\u043b\u044e\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u043e (Linux), \u0434\u043e 9.2.0-fstec (Platform V SberLinux OS Server)",
  "\u0412\u043e\u0437\u043c\u043e\u0436\u043d\u044b\u0435 \u043c\u0435\u0440\u044b \u043f\u043e \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u044e": "\u0412 \u0443\u0441\u043b\u043e\u0432\u0438\u044f\u0445 \u043e\u0442\u0441\u0443\u0442\u0441\u0442\u0432\u0438\u044f \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0439 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 \u043e\u0442 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044f \u0440\u0435\u043a\u043e\u043c\u0435\u043d\u0434\u0443\u0435\u0442\u0441\u044f \u043f\u0440\u0438\u0434\u0435\u0440\u0436\u0438\u0432\u0430\u0442\u044c\u0441\u044f \"\u0420\u0435\u043a\u043e\u043c\u0435\u043d\u0434\u0430\u0446\u0438\u0439 \u043f\u043e \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0439 \u043d\u0430\u0441\u0442\u0440\u043e\u0439\u043a\u0435 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u043e\u043d\u043d\u044b\u0445 \u0441\u0438\u0441\u0442\u0435\u043c LINUX\", \u0438\u0437\u043b\u043e\u0436\u0435\u043d\u043d\u044b\u0445 \u0432 \u043c\u0435\u0442\u043e\u0434\u0438\u0447\u0435\u0441\u043a\u043e\u043c \u0434\u043e\u043a\u0443\u043c\u0435\u043d\u0442\u0435 \u0424\u0421\u0422\u042d\u041a \u0420\u043e\u0441\u0441\u0438\u0438, \u0443\u0442\u0432\u0435\u0440\u0436\u0434\u0451\u043d\u043d\u043e\u043c 25 \u0434\u0435\u043a\u0430\u0431\u0440\u044f 2022 \u0433\u043e\u0434\u0430.\n\n\n\n\u0418\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u0440\u0435\u043a\u043e\u043c\u0435\u043d\u0434\u0430\u0446\u0438\u0439:\n\n\u0414\u043b\u044f Linux:\nhttps://git.kernel.org/stable/c/faf44487dfc80817f178dc8de7a0b73f960d019b\nhttps://git.kernel.org/stable/c/1194ad0d44d66b273a02a3a22882dc863a68d764\nhttps://git.kernel.org/stable/c/fafaa4982bedb5532f5952000f714a3e63023f40\nhttps://git.kernel.org/linus/897e8601b9cff1d054cdd53047f568b0e1995726\nhttps://kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6.101\nhttps://kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.12.41\nhttps://kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.15.9\n\n\u0414\u043b\u044f \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u044b\u0445 \u043f\u0440\u043e\u0434\u0443\u043a\u0442\u043e\u0432 Red Hat Inc.:\nhttps://access.redhat.com/security/cve/cve-2025-39726\n\n\u0414\u043b\u044f Debian GNU/Linux:\nhttps://security-tracker.debian.org/tracker/CVE-2025-39726\n\n\u0414\u043b\u044f Ubuntu:\nhttps://ubuntu.com/security/notices/USN-7879-1\nhttps://ubuntu.com/security/notices/USN-7879-2\nhttps://ubuntu.com/security/notices/USN-7880-1\nhttps://ubuntu.com/security/notices/USN-7879-3\n\n\u0414\u043b\u044f Platform V SberLinux OS Server:\n\u041e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0435 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u043e\u043d\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0434\u043e \u0432\u0435\u0440\u0441\u0438\u0438 9.2.0-fstec \u0438\u043b\u0438 \u0432\u044b\u0448\u0435",
  "\u0414\u0430\u0442\u0430 \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0438\u044f": "24.07.2025",
  "\u0414\u0430\u0442\u0430 \u043f\u043e\u0441\u043b\u0435\u0434\u043d\u0435\u0433\u043e \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f": "29.04.2026",
  "\u0414\u0430\u0442\u0430 \u043f\u0443\u0431\u043b\u0438\u043a\u0430\u0446\u0438\u0438": "29.04.2026",
  "\u0418\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440": "BDU:2026-06106",
  "\u0418\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440\u044b \u0434\u0440\u0443\u0433\u0438\u0445 \u0441\u0438\u0441\u0442\u0435\u043c \u043e\u043f\u0438\u0441\u0430\u043d\u0438\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "CVE-2025-39726",
  "\u0418\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f \u043e\u0431 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0438": "\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430",
  "\u041a\u043b\u0430\u0441\u0441 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043a\u043e\u0434\u0430",
  "\u041d\u0430\u0437\u0432\u0430\u043d\u0438\u0435 \u041f\u041e": "Red Hat Enterprise Linux, Ubuntu, Debian GNU/Linux, Linux, Platform V SberLinux OS Server (\u0437\u0430\u043f\u0438\u0441\u044c \u0432 \u0435\u0434\u0438\u043d\u043e\u043c \u0440\u0435\u0435\u0441\u0442\u0440\u0435 \u0440\u043e\u0441\u0441\u0438\u0439\u0441\u043a\u0438\u0445 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c \u211618785)",
  "\u041d\u0430\u0438\u043c\u0435\u043d\u043e\u0432\u0430\u043d\u0438\u0435 \u041e\u0421 \u0438 \u0442\u0438\u043f \u0430\u043f\u043f\u0430\u0440\u0430\u0442\u043d\u043e\u0439 \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u044b": "Red Hat, Inc. Red Hat Enterprise Linux 8 , Red Hat, Inc. Red Hat Enterprise Linux 9 , Canonical Ltd. Ubuntu 24.04 LTS , \u0421\u043e\u043e\u0431\u0449\u0435\u0441\u0442\u0432\u043e \u0441\u0432\u043e\u0431\u043e\u0434\u043d\u043e\u0433\u043e \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e\u0433\u043e \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044f Debian GNU/Linux 13 , \u0421\u043e\u043e\u0431\u0449\u0435\u0441\u0442\u0432\u043e \u0441\u0432\u043e\u0431\u043e\u0434\u043d\u043e\u0433\u043e \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e\u0433\u043e \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044f Linux \u043e\u0442 4.19 \u0434\u043e 6.6.100 \u0432\u043a\u043b\u044e\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u043e , \u0421\u043e\u043e\u0431\u0449\u0435\u0441\u0442\u0432\u043e \u0441\u0432\u043e\u0431\u043e\u0434\u043d\u043e\u0433\u043e \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e\u0433\u043e \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044f Linux \u043e\u0442 6.7 \u0434\u043e 6.12.40 \u0432\u043a\u043b\u044e\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u043e , \u0421\u043e\u043e\u0431\u0449\u0435\u0441\u0442\u0432\u043e \u0441\u0432\u043e\u0431\u043e\u0434\u043d\u043e\u0433\u043e \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e\u0433\u043e \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044f Linux \u043e\u0442 6.13 \u0434\u043e 6.15.8 \u0432\u043a\u043b\u044e\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u043e , \u0410\u041e \u00ab\u0421\u0431\u0435\u0440\u0422\u0435\u0445\u00bb Platform V SberLinux OS Server \u0434\u043e 9.2.0-fstec  (\u0437\u0430\u043f\u0438\u0441\u044c \u0432 \u0435\u0434\u0438\u043d\u043e\u043c \u0440\u0435\u0435\u0441\u0442\u0440\u0435 \u0440\u043e\u0441\u0441\u0438\u0439\u0441\u043a\u0438\u0445 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c \u211618785)",
  "\u041d\u0430\u0438\u043c\u0435\u043d\u043e\u0432\u0430\u043d\u0438\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0444\u0443\u043d\u043a\u0446\u0438\u0439 ism_cmd() \u0438 ism_probe() \u0432 \u043c\u043e\u0434\u0443\u043b\u0435 drivers/s390/net/ism_drv.c \u0434\u0440\u0430\u0439\u0432\u0435\u0440\u0430 \u0441\u0435\u0442\u0438 \u043d\u0430 \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u0435 S390 \u044f\u0434\u0440\u0430 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u043e\u043d\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b Linux, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043d\u0430\u0440\u0443\u0448\u0438\u0442\u0435\u043b\u044e \u0432\u044b\u0437\u0432\u0430\u0442\u044c \u043e\u0442\u043a\u0430\u0437 \u0432 \u043e\u0431\u0441\u043b\u0443\u0436\u0438\u0432\u0430\u043d\u0438\u0438",
  "\u041d\u0430\u043b\u0438\u0447\u0438\u0435 \u044d\u043a\u0441\u043f\u043b\u043e\u0439\u0442\u0430": "\u0414\u0430\u043d\u043d\u044b\u0435 \u0443\u0442\u043e\u0447\u043d\u044f\u044e\u0442\u0441\u044f",
  "\u041e\u043f\u0438\u0441\u0430\u043d\u0438\u0435 \u043e\u0448\u0438\u0431\u043a\u0438 CWE": "\u041e\u0434\u043d\u043e\u0432\u0440\u0435\u043c\u0435\u043d\u043d\u043e\u0435 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u0441 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435\u043c \u043e\u0431\u0449\u0435\u0433\u043e \u0440\u0435\u0441\u0443\u0440\u0441\u0430 \u0441 \u043d\u0435\u043f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u043e\u0439 \u0441\u0438\u043d\u0445\u0440\u043e\u043d\u0438\u0437\u0430\u0446\u0438\u0435\u0439 (\u00ab\u0421\u0438\u0442\u0443\u0430\u0446\u0438\u044f \u0433\u043e\u043d\u043a\u0438\u00bb) (CWE-362), \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u0441\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0435\u043c (CWE-371)",
  "\u041e\u043f\u0438\u0441\u0430\u043d\u0438\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0444\u0443\u043d\u043a\u0446\u0438\u0439 ism_cmd() \u0438 ism_probe() \u0432 \u043c\u043e\u0434\u0443\u043b\u0435 drivers/s390/net/ism_drv.c \u0434\u0440\u0430\u0439\u0432\u0435\u0440\u0430 \u0441\u0435\u0442\u0438 \u043d\u0430 \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u0435 S390 \u044f\u0434\u0440\u0430 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u043e\u043d\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b Linux \u0441\u0432\u044f\u0437\u0430\u043d\u0430 \u0441 \u043e\u0448\u0438\u0431\u043a\u0430\u043c\u0438 \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u0441\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0435\u043c. \u042d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043c\u043e\u0436\u0435\u0442 \u043f\u043e\u0437\u0432\u043e\u043b\u0438\u0442\u044c \u043d\u0430\u0440\u0443\u0448\u0438\u0442\u0435\u043b\u044e \u0432\u044b\u0437\u0432\u0430\u0442\u044c \u043e\u0442\u043a\u0430\u0437 \u0432 \u043e\u0431\u0441\u043b\u0443\u0436\u0438\u0432\u0430\u043d\u0438\u0438",
  "\u041f\u043e\u0441\u043b\u0435\u0434\u0441\u0442\u0432\u0438\u044f \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": null,
  "\u041f\u0440\u043e\u0447\u0430\u044f \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f": null,
  "\u0421\u0432\u044f\u0437\u044c \u0441 \u0438\u043d\u0446\u0438\u0434\u0435\u043d\u0442\u0430\u043c\u0438 \u0418\u0411": "\u0414\u0430\u043d\u043d\u044b\u0435 \u0443\u0442\u043e\u0447\u043d\u044f\u044e\u0442\u0441\u044f",
  "\u0421\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u0430",
  "\u0421\u043f\u043e\u0441\u043e\u0431 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u044f": "\u041e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0435 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e\u0433\u043e \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044f",
  "\u0421\u043f\u043e\u0441\u043e\u0431 \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438": "\u041c\u0430\u043d\u0438\u043f\u0443\u043b\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u0441\u0440\u043e\u043a\u0430\u043c\u0438 \u0438 \u0441\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0435\u043c",
  "\u0421\u0441\u044b\u043b\u043a\u0438 \u043d\u0430 \u0438\u0441\u0442\u043e\u0447\u043d\u0438\u043a\u0438": "https://git.kernel.org/stable/c/faf44487dfc80817f178dc8de7a0b73f960d019b\nhttps://git.kernel.org/stable/c/1194ad0d44d66b273a02a3a22882dc863a68d764\nhttps://git.kernel.org/stable/c/fafaa4982bedb5532f5952000f714a3e63023f40\nhttps://www.cve.org/CVERecord?id=CVE-2025-39726\nhttps://git.kernel.org/linus/897e8601b9cff1d054cdd53047f568b0e1995726\nhttps://ubuntu.com/security/notices/USN-7879-1\nhttps://ubuntu.com/security/notices/USN-7879-2\nhttps://ubuntu.com/security/notices/USN-7880-1\nhttps://ubuntu.com/security/notices/USN-7879-3\nhttps://kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6.101\nhttps://kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.12.41\nhttps://kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.15.9\nhttps://access.redhat.com/security/cve/cve-2025-39726",
  "\u0421\u0442\u0430\u0442\u0443\u0441 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u041f\u043e\u0434\u0442\u0432\u0435\u0440\u0436\u0434\u0435\u043d\u0430 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u0435\u043c",
  "\u0422\u0438\u043f \u041f\u041e": "\u041e\u043f\u0435\u0440\u0430\u0446\u0438\u043e\u043d\u043d\u0430\u044f \u0441\u0438\u0441\u0442\u0435\u043c\u0430",
  "\u0422\u0438\u043f \u043e\u0448\u0438\u0431\u043a\u0438 CWE": "CWE-362, CWE-371",
  "\u0423\u0440\u043e\u0432\u0435\u043d\u044c \u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u041d\u0438\u0437\u043a\u0438\u0439 \u0443\u0440\u043e\u0432\u0435\u043d\u044c \u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 (\u0431\u0430\u0437\u043e\u0432\u0430\u044f \u043e\u0446\u0435\u043d\u043a\u0430 CVSS 2.0 \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 3,8)\n\u0421\u0440\u0435\u0434\u043d\u0438\u0439 \u0443\u0440\u043e\u0432\u0435\u043d\u044c \u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 (\u0431\u0430\u0437\u043e\u0432\u0430\u044f \u043e\u0446\u0435\u043d\u043a\u0430 CVSS 3.1 \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 4,7)"
}

CVE-2025-39726 (GCVE-0-2025-39726)

Vulnerability from cvelistv5 – Published: 2025-09-05 17:27 – Updated: 2026-08-05 12:04

Title

s390/ism: fix concurrency management in ism_cmd()

Summary

In the Linux kernel, the following vulnerability has been resolved: s390/ism: fix concurrency management in ism_cmd() The s390x ISM device data sheet clearly states that only one request-response sequence is allowable per ISM function at any point in time. Unfortunately as of today the s390/ism driver in Linux does not honor that requirement. This patch aims to rectify that. This problem was discovered based on Aliaksei's bug report which states that for certain workloads the ISM functions end up entering error state (with PEC 2 as seen from the logs) after a while and as a consequence connections handled by the respective function break, and for future connection requests the ISM device is not considered -- given it is in a dysfunctional state. During further debugging PEC 3A was observed as well. A kernel message like [ 1211.244319] zpci: 061a:00:00.0: Event 0x2 reports an error for PCI function 0x61a is a reliable indicator of the stated function entering error state with PEC 2. Let me also point out that a kernel message like [ 1211.244325] zpci: 061a:00:00.0: The ism driver bound to the device does not support error recovery is a reliable indicator that the ISM function won't be auto-recovered because the ISM driver currently lacks support for it. On a technical level, without this synchronization, commands (inputs to the FW) may be partially or fully overwritten (corrupted) by another CPU trying to issue commands on the same function. There is hard evidence that this can lead to DMB token values being used as DMB IOVAs, leading to PEC 2 PCI events indicating invalid DMA. But this is only one of the failure modes imaginable. In theory even completely losing one command and executing another one twice and then trying to interpret the outputs as if the command we intended to execute was actually executed and not the other one is also possible. Frankly, I don't feel confident about providing an exhaustive list of possible consequences.

Severity

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/faf44487dfc80817f…
https://git.kernel.org/stable/c/1194ad0d44d66b273…
https://git.kernel.org/stable/c/fafaa4982bedb5532…
https://git.kernel.org/stable/c/897e8601b9cff1d05…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 684b89bc39ce4f204b1a2b180f39f2eb36a6b695 , < faf44487dfc80817f178dc8de7a0b73f960d019b (git) Affected: 684b89bc39ce4f204b1a2b180f39f2eb36a6b695 , < 1194ad0d44d66b273a02a3a22882dc863a68d764 (git) Affected: 684b89bc39ce4f204b1a2b180f39f2eb36a6b695 , < fafaa4982bedb5532f5952000f714a3e63023f40 (git) Affected: 684b89bc39ce4f204b1a2b180f39f2eb36a6b695 , < 897e8601b9cff1d054cdd53047f568b0e1995726 (git)
Linux	Linux	Affected: 4.19 Unaffected: 0 , < 4.19 (semver) Unaffected: 6.6.101 , ≤ 6.6.* (semver) Unaffected: 6.12.41 , ≤ 6.12.* (semver) Unaffected: 6.15.9 , ≤ 6.15.* (semver) Unaffected: 6.16 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/s390/net/ism_drv.c",
            "include/linux/ism.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "faf44487dfc80817f178dc8de7a0b73f960d019b",
              "status": "affected",
              "version": "684b89bc39ce4f204b1a2b180f39f2eb36a6b695",
              "versionType": "git"
            },
            {
              "lessThan": "1194ad0d44d66b273a02a3a22882dc863a68d764",
              "status": "affected",
              "version": "684b89bc39ce4f204b1a2b180f39f2eb36a6b695",
              "versionType": "git"
            },
            {
              "lessThan": "fafaa4982bedb5532f5952000f714a3e63023f40",
              "status": "affected",
              "version": "684b89bc39ce4f204b1a2b180f39f2eb36a6b695",
              "versionType": "git"
            },
            {
              "lessThan": "897e8601b9cff1d054cdd53047f568b0e1995726",
              "status": "affected",
              "version": "684b89bc39ce4f204b1a2b180f39f2eb36a6b695",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/s390/net/ism_drv.c",
            "include/linux/ism.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.19"
            },
            {
              "lessThan": "4.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.101",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.41",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.15.*",
              "status": "unaffected",
              "version": "6.15.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.16",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.101",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.41",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.15.9",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/ism: fix concurrency management in ism_cmd()\n\nThe s390x ISM device data sheet clearly states that only one\nrequest-response sequence is allowable per ISM function at any point in\ntime.  Unfortunately as of today the s390/ism driver in Linux does not\nhonor that requirement. This patch aims to rectify that.\n\nThis problem was discovered based on Aliaksei\u0027s bug report which states\nthat for certain workloads the ISM functions end up entering error state\n(with PEC 2 as seen from the logs) after a while and as a consequence\nconnections handled by the respective function break, and for future\nconnection requests the ISM device is not considered -- given it is in a\ndysfunctional state. During further debugging PEC 3A was observed as\nwell.\n\nA kernel message like\n[ 1211.244319] zpci: 061a:00:00.0: Event 0x2 reports an error for PCI function 0x61a\nis a reliable indicator of the stated function entering error state\nwith PEC 2. Let me also point out that a kernel message like\n[ 1211.244325] zpci: 061a:00:00.0: The ism driver bound to the device does not support error recovery\nis a reliable indicator that the ISM function won\u0027t be auto-recovered\nbecause the ISM driver currently lacks support for it.\n\nOn a technical level, without this synchronization, commands (inputs to\nthe FW) may be partially or fully overwritten (corrupted) by another CPU\ntrying to issue commands on the same function. There is hard evidence that\nthis can lead to DMB token values being used as DMB IOVAs, leading to\nPEC 2 PCI events indicating invalid DMA. But this is only one of the\nfailure modes imaginable. In theory even completely losing one command\nand executing another one twice and then trying to interpret the outputs\nas if the command we intended to execute was actually executed and not\nthe other one is also possible.  Frankly, I don\u0027t feel confident about\nproviding an exhaustive list of possible consequences."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - Every path into `ism_cmd()` is driven by the SMC protocol stack \u2014 a remote TCP peer connecting to an SMC-enabled listener causes `smc_listen_work` to issue ISM QUERY_RGID/ADD_VLAN_ID/REG_DMB commands using values from the peer\u0027s CLC Proposal, and closing the connection issues SIGNAL_IEQ/UNREG_DMB/DEL_VLAN_ID from the unserialized lgr-free work. The attacker never needs local access.\nAC:L - The attacker controls both sides of the race by churning concurrent SMC-D connection setups and teardowns, which execute `ism_cmd()` in parallel on different CPUs (setup under `smc_*_lgr_pending`, teardown under no serialization at all). The commit confirms ordinary workloads already hit this \"after a while,\" so deliberate hammering is reliable.\nPR:N - The SMC CLC handshake has no authentication and `af_smc.c` contains no capability checks, so `smc_ism_cantalk()` reaches `ism_cmd()` with peer-supplied GID/CHID before any credential is ever presented. Locally the equivalent path needs only an unprivileged AF_SMC socket or `TCP_ULP=smc`.\nUI:N - Triggering requires only that the attacker open and close connections; no action by any local user or administrator is needed. The victim host merely has to have an ISM device and SMC-D in use, which is configuration, not interaction.\nS:U - The corrupted commands and misrouted DMB registrations affect resources managed by the same kernel/ISM-function security authority, and bad DMA is contained by the zPCI translation hardware. No hypervisor, LPAR, or IOMMU boundary is escaped.\nC:H - A response read back for the wrong command makes `ism_register_dmb()` store another command\u0027s `dmb_tok`, and that token is advertised to the remote peer in the CLC message, so the local socket ends up reading a different connection\u0027s DMB contents \u2014 cross-connection, cross-user, cross-LPAR payload disclosure. Corrupted `REG_DMB.rgid` similarly exposes a buffer to an unintended remote GID.\nI:H - With a misassigned DMB token the remote peer\u0027s ISM move writes application data directly into a different connection\u0027s receive buffer, and a corrupted `UNREG_DMB.dmb_tok` unregisters the wrong DMB in firmware while the driver\u0027s view diverges. The maintainer states commands may be partially overwritten or executed twice with outputs misinterpreted, and declines to bound the consequences.\nA:H - Command corruption puts the ISM PCI function into error state (PEC 2/3A), breaking every SMC-D connection on it, and the ISM driver implements no error recovery so the device is permanently excluded from future connections until manual intervention. This is a persistent denial of service affecting all users of the adapter."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:04:53.432Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/faf44487dfc80817f178dc8de7a0b73f960d019b"
        },
        {
          "url": "https://git.kernel.org/stable/c/1194ad0d44d66b273a02a3a22882dc863a68d764"
        },
        {
          "url": "https://git.kernel.org/stable/c/fafaa4982bedb5532f5952000f714a3e63023f40"
        },
        {
          "url": "https://git.kernel.org/stable/c/897e8601b9cff1d054cdd53047f568b0e1995726"
        }
      ],
      "title": "s390/ism: fix concurrency management in ism_cmd()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39726",
    "datePublished": "2025-09-05T17:27:19.818Z",
    "dateReserved": "2025-04-16T07:20:57.117Z",
    "dateUpdated": "2026-08-05T12:04:53.432Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

BDU:2026-06106 (CVE-2025-39726)

CVE-2025-39726 (GCVE-0-2025-39726)

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