CWE-362
Allowed-with-ReviewConcurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Abstraction: Class · Status: Draft
The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.
2903 vulnerabilities reference this CWE, most recent first.
GHSA-2X8C-95VH-GFV4
Vulnerability from github – Published: 2024-07-01 15:32 – Updated: 2026-05-12 12:31A signal handler race condition was found in OpenSSH's server (sshd), where a client does not authenticate within LoginGraceTime seconds (120 by default, 600 in old OpenSSH versions), then sshd's SIGALRM handler is called asynchronously. However, this signal handler calls various functions that are not async-signal-safe, for example, syslog().
{
"affected": [],
"aliases": [
"CVE-2024-6387"
],
"database_specific": {
"cwe_ids": [
"CWE-362",
"CWE-364"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-07-01T13:15:06Z",
"severity": "HIGH"
},
"details": "A signal handler race condition was found in OpenSSH\u0027s server (sshd), where a client does not authenticate within LoginGraceTime seconds (120 by default, 600 in old OpenSSH versions), then sshd\u0027s SIGALRM handler is called asynchronously. However, this signal handler calls various functions that are not async-signal-safe, for example, syslog().",
"id": "GHSA-2x8c-95vh-gfv4",
"modified": "2026-05-12T12:31:59Z",
"published": "2024-07-01T15:32:33Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-6387"
},
{
"type": "WEB",
"url": "https://github.com/rapier1/hpn-ssh/issues/87"
},
{
"type": "WEB",
"url": "https://github.com/oracle/oracle-linux/issues/149"
},
{
"type": "WEB",
"url": "https://github.com/microsoft/azurelinux/issues/9555"
},
{
"type": "WEB",
"url": "https://github.com/PowerShell/Win32-OpenSSH/issues/2249"
},
{
"type": "WEB",
"url": "https://github.com/Azure/AKS/issues/4379"
},
{
"type": "WEB",
"url": "https://github.com/AlmaLinux/updates/issues/629"
},
{
"type": "WEB",
"url": "https://github.com/openela-main/openssh/commit/e1f438970e5a337a17070a637c1b9e19697cad09"
},
{
"type": "WEB",
"url": "https://packetstorm.news/files/id/190587"
},
{
"type": "WEB",
"url": "https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2024-0010"
},
{
"type": "WEB",
"url": "https://santandersecurityresearch.github.io/blog/sshing_the_masses.html"
},
{
"type": "WEB",
"url": "https://security-tracker.debian.org/tracker/CVE-2024-6387"
},
{
"type": "WEB",
"url": "https://security.netapp.com/advisory/ntap-20240701-0001"
},
{
"type": "WEB",
"url": "https://sig-security.rocky.page/issues/CVE-2024-6387"
},
{
"type": "WEB",
"url": "https://stackdiary.com/openssh-race-condition-in-sshd-allows-remote-code-execution"
},
{
"type": "WEB",
"url": "https://support.apple.com/kb/HT214118"
},
{
"type": "WEB",
"url": "https://support.apple.com/kb/HT214119"
},
{
"type": "WEB",
"url": "https://support.apple.com/kb/HT214120"
},
{
"type": "WEB",
"url": "https://ubuntu.com/security/CVE-2024-6387"
},
{
"type": "WEB",
"url": "https://ubuntu.com/security/notices/USN-6859-1"
},
{
"type": "WEB",
"url": "https://www.akamai.com/blog/security-research/2024-openssh-vulnerability-regression-what-to-know-and-do"
},
{
"type": "WEB",
"url": "https://www.arista.com/en/support/advisories-notices/security-advisory/19904-security-advisory-0100"
},
{
"type": "WEB",
"url": "https://www.exploit-db.com/exploits/52269"
},
{
"type": "WEB",
"url": "https://www.freebsd.org/security/advisories/FreeBSD-SA-24:04.openssh.asc"
},
{
"type": "WEB",
"url": "https://www.openssh.com/txt/release-9.8"
},
{
"type": "WEB",
"url": "https://www.qualys.com/2024/07/01/cve-2024-6387/regresshion.txt"
},
{
"type": "WEB",
"url": "https://www.splunk.com/en_us/blog/security/cve-2024-6387-regresshion-vulnerability.html"
},
{
"type": "WEB",
"url": "https://www.suse.com/security/cve/CVE-2024-6387.html"
},
{
"type": "WEB",
"url": "https://www.theregister.com/2024/07/01/regresshion_openssh"
},
{
"type": "WEB",
"url": "https://www.vicarius.io/vsociety/posts/regresshion-an-openssh-regression-error-cve-2024-6387"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2024:4312"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2024:4340"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2024:4389"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2024:4469"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2024:4474"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2024:4479"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2024:4484"
},
{
"type": "WEB",
"url": "https://access.redhat.com/security/cve/CVE-2024-6387"
},
{
"type": "WEB",
"url": "https://archlinux.org/news/the-sshd-service-needs-to-be-restarted-after-upgrading-to-openssh-98p1"
},
{
"type": "WEB",
"url": "https://arstechnica.com/security/2024/07/regresshion-vulnerability-in-openssh-gives-attackers-root-on-linux"
},
{
"type": "WEB",
"url": "https://blog.qualys.com/vulnerabilities-threat-research/2024/07/01/regresshion-remote-unauthenticated-code-execution-vulnerability-in-openssh-server"
},
{
"type": "WEB",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2294604"
},
{
"type": "WEB",
"url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
},
{
"type": "WEB",
"url": "https://cert-portal.siemens.com/productcert/html/ssa-446545.html"
},
{
"type": "WEB",
"url": "https://explore.alas.aws.amazon.com/CVE-2024-6387.html"
},
{
"type": "WEB",
"url": "https://forum.vmssoftware.com/viewtopic.php?f=8\u0026t=9132"
},
{
"type": "WEB",
"url": "https://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2024-002.txt.asc"
},
{
"type": "WEB",
"url": "https://github.com/PowerShell/Win32-OpenSSH/discussions/2248"
},
{
"type": "WEB",
"url": "https://github.com/zgzhang/cve-2024-6387-poc"
},
{
"type": "WEB",
"url": "https://lists.almalinux.org/archives/list/announce@lists.almalinux.org/thread/23BF5BMGFVEVUI2WNVAGMLKT557EU7VY"
},
{
"type": "WEB",
"url": "https://lists.mindrot.org/pipermail/openssh-unix-announce/2024-July/000158.html"
},
{
"type": "WEB",
"url": "https://lists.mindrot.org/pipermail/openssh-unix-dev/2024-July/041431.html"
},
{
"type": "WEB",
"url": "https://news.ycombinator.com/item?id=40843778"
},
{
"type": "WEB",
"url": "http://seclists.org/fulldisclosure/2024/Jul/18"
},
{
"type": "WEB",
"url": "http://seclists.org/fulldisclosure/2024/Jul/19"
},
{
"type": "WEB",
"url": "http://seclists.org/fulldisclosure/2024/Jul/20"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2024/07/01/12"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2024/07/01/13"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2024/07/02/1"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2024/07/03/1"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2024/07/03/11"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2024/07/03/2"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2024/07/03/3"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2024/07/03/4"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2024/07/03/5"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2024/07/04/1"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2024/07/04/2"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2024/07/08/2"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2024/07/08/3"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2024/07/09/2"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2024/07/09/5"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2024/07/10/1"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2024/07/10/2"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2024/07/10/3"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2024/07/10/4"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2024/07/10/6"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2024/07/11/1"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2024/07/11/3"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2024/07/23/4"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2024/07/23/6"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2024/07/28/2"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2024/07/28/3"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-2XVJ-J3QH-X8C3
Vulnerability from github – Published: 2018-07-31 18:13 – Updated: 2023-08-25 21:42The private_address_check ruby gem before 0.5.0 is vulnerable to a time-of-check time-of-use (TOCTOU) race condition due to the address the socket uses not being checked. DNS entries with a TTL of 0 can trigger this case where the initial resolution is a public address but the subsequent resolution is a private address.
{
"affected": [
{
"package": {
"ecosystem": "RubyGems",
"name": "private_address_check"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.5.0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2018-3759"
],
"database_specific": {
"cwe_ids": [
"CWE-362"
],
"github_reviewed": true,
"github_reviewed_at": "2020-06-16T20:53:26Z",
"nvd_published_at": null,
"severity": "HIGH"
},
"details": "The private_address_check ruby gem before 0.5.0 is vulnerable to a time-of-check time-of-use (TOCTOU) race condition due to the address the socket uses not being checked. DNS entries with a TTL of 0 can trigger this case where the initial resolution is a public address but the subsequent resolution is a private address.",
"id": "GHSA-2xvj-j3qh-x8c3",
"modified": "2023-08-25T21:42:19Z",
"published": "2018-07-31T18:13:05Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2018-3759"
},
{
"type": "WEB",
"url": "https://github.com/jtdowney/private_address_check/commit/4068228187db87fea7577f7020099399772bb147"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-2xvj-j3qh-x8c3"
},
{
"type": "PACKAGE",
"url": "https://github.com/jtdowney/private_address_check"
},
{
"type": "WEB",
"url": "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/private_address_check/CVE-2018-3759.yml"
}
],
"schema_version": "1.4.0",
"severity": [],
"summary": "private_address_check contains race condition"
}
GHSA-324C-R2G2-547C
Vulnerability from github – Published: 2025-07-08 18:31 – Updated: 2025-07-08 18:31Concurrent execution using shared resource with improper synchronization ('race condition') in Workspace Broker allows an authorized attacker to elevate privileges locally.
{
"affected": [],
"aliases": [
"CVE-2025-49665"
],
"database_specific": {
"cwe_ids": [
"CWE-362"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-07-08T17:15:49Z",
"severity": "HIGH"
},
"details": "Concurrent execution using shared resource with improper synchronization (\u0027race condition\u0027) in Workspace Broker allows an authorized attacker to elevate privileges locally.",
"id": "GHSA-324c-r2g2-547c",
"modified": "2025-07-08T18:31:46Z",
"published": "2025-07-08T18:31:46Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-49665"
},
{
"type": "WEB",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-49665"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-326H-W5X2-4VRM
Vulnerability from github – Published: 2025-09-22 21:30 – Updated: 2025-09-22 21:30A vulnerability has been found in Smartstore up to 6.2.0. The affected element is an unknown function of the file /checkout/confirm/ of the component Gift Voucher Handler. The manipulation leads to race condition. The attack may be initiated remotely. The attack's complexity is rated as high. The exploitability is described as difficult. The vendor was contacted early about this disclosure but did not respond in any way.
{
"affected": [],
"aliases": [
"CVE-2025-10778"
],
"database_specific": {
"cwe_ids": [
"CWE-362"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-09-22T03:15:56Z",
"severity": "LOW"
},
"details": "A vulnerability has been found in Smartstore up to 6.2.0. The affected element is an unknown function of the file /checkout/confirm/ of the component Gift Voucher Handler. The manipulation leads to race condition. The attack may be initiated remotely. The attack\u0027s complexity is rated as high. The exploitability is described as difficult. The vendor was contacted early about this disclosure but did not respond in any way.",
"id": "GHSA-326h-w5x2-4vrm",
"modified": "2025-09-22T21:30:20Z",
"published": "2025-09-22T21:30:20Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-10778"
},
{
"type": "WEB",
"url": "https://vuldb.com/?ctiid.325134"
},
{
"type": "WEB",
"url": "https://vuldb.com/?id.325134"
},
{
"type": "WEB",
"url": "https://vuldb.com/?submit.640785"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"type": "CVSS_V4"
}
]
}
GHSA-32H2-5PXQ-28CX
Vulnerability from github – Published: 2022-05-13 01:26 – Updated: 2022-05-13 01:26Race condition in the sandbox launcher implementation in Google Chrome before 11.0.696.57 on Linux allows remote attackers to cause a denial of service or possibly have unspecified other impact via unknown vectors.
{
"affected": [],
"aliases": [
"CVE-2011-1444"
],
"database_specific": {
"cwe_ids": [
"CWE-362"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2011-05-03T22:55:00Z",
"severity": "MODERATE"
},
"details": "Race condition in the sandbox launcher implementation in Google Chrome before 11.0.696.57 on Linux allows remote attackers to cause a denial of service or possibly have unspecified other impact via unknown vectors.",
"id": "GHSA-32h2-5pxq-28cx",
"modified": "2022-05-13T01:26:13Z",
"published": "2022-05-13T01:26:13Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2011-1444"
},
{
"type": "WEB",
"url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/67151"
},
{
"type": "WEB",
"url": "https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A14372"
},
{
"type": "WEB",
"url": "http://code.google.com/p/chromium/issues/detail?id=76542"
},
{
"type": "WEB",
"url": "http://googlechromereleases.blogspot.com/2011/04/chrome-stable-update.html"
},
{
"type": "WEB",
"url": "http://www.debian.org/security/2011/dsa-2245"
}
],
"schema_version": "1.4.0",
"severity": []
}
GHSA-32M9-JM89-HM8P
Vulnerability from github – Published: 2026-06-09 18:30 – Updated: 2026-06-09 18:30Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
{
"affected": [],
"aliases": [
"CVE-2026-45596"
],
"database_specific": {
"cwe_ids": [
"CWE-362"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-06-09T17:17:27Z",
"severity": "HIGH"
},
"details": "Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.",
"id": "GHSA-32m9-jm89-hm8p",
"modified": "2026-06-09T18:30:51Z",
"published": "2026-06-09T18:30:51Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45596"
},
{
"type": "WEB",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45596"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-32MX-364X-QGQ2
Vulnerability from github – Published: 2022-10-12 12:00 – Updated: 2025-01-03 00:31Windows Point-to-Point Tunneling Protocol Remote Code Execution Vulnerability. This CVE ID is unique from CVE-2022-22035, CVE-2022-24504, CVE-2022-30198, CVE-2022-33634, CVE-2022-38047, CVE-2022-41081.
{
"affected": [],
"aliases": [
"CVE-2022-38000"
],
"database_specific": {
"cwe_ids": [
"CWE-362"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2022-10-11T19:15:00Z",
"severity": "HIGH"
},
"details": "Windows Point-to-Point Tunneling Protocol Remote Code Execution Vulnerability. This CVE ID is unique from CVE-2022-22035, CVE-2022-24504, CVE-2022-30198, CVE-2022-33634, CVE-2022-38047, CVE-2022-41081.",
"id": "GHSA-32mx-364x-qgq2",
"modified": "2025-01-03T00:31:07Z",
"published": "2022-10-12T12:00:28Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-38000"
},
{
"type": "WEB",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-38000"
},
{
"type": "WEB",
"url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2022-38000"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-32PG-5795-JH5M
Vulnerability from github – Published: 2022-05-02 06:13 – Updated: 2022-05-02 06:13Race condition in the installation package in Apple iTunes before 9.1 on Windows allows local users to gain privileges by replacing an unspecified file with a Trojan horse.
{
"affected": [],
"aliases": [
"CVE-2010-0532"
],
"database_specific": {
"cwe_ids": [
"CWE-362"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2010-03-31T18:30:00Z",
"severity": "MODERATE"
},
"details": "Race condition in the installation package in Apple iTunes before 9.1 on Windows allows local users to gain privileges by replacing an unspecified file with a Trojan horse.",
"id": "GHSA-32pg-5795-jh5m",
"modified": "2022-05-02T06:13:29Z",
"published": "2022-05-02T06:13:29Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2010-0532"
},
{
"type": "WEB",
"url": "https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7110"
},
{
"type": "WEB",
"url": "http://lists.apple.com/archives/security-announce/2010//Mar/msg00003.html"
},
{
"type": "WEB",
"url": "http://secunia.com/advisories/39135"
},
{
"type": "WEB",
"url": "http://support.apple.com/kb/HT4105"
}
],
"schema_version": "1.4.0",
"severity": []
}
GHSA-32PV-2J2R-JJWX
Vulnerability from github – Published: 2026-07-14 18:32 – Updated: 2026-07-14 18:32Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Network File System allows an unauthorized attacker to execute code over a network.
{
"affected": [],
"aliases": [
"CVE-2026-56649"
],
"database_specific": {
"cwe_ids": [
"CWE-362"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-07-14T18:18:31Z",
"severity": "MODERATE"
},
"details": "Concurrent execution using shared resource with improper synchronization (\u0027race condition\u0027) in Windows Network File System allows an unauthorized attacker to execute code over a network.",
"id": "GHSA-32pv-2j2r-jjwx",
"modified": "2026-07-14T18:32:38Z",
"published": "2026-07-14T18:32:38Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56649"
},
{
"type": "WEB",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56649"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-32QQ-4Q5R-H4XR
Vulnerability from github – Published: 2022-03-11 00:02 – Updated: 2022-03-18 00:01Linux PV device frontends vulnerable to attacks by backends T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Several Linux PV device frontends are using the grant table interfaces for removing access rights of the backends in ways being subject to race conditions, resulting in potential data leaks, data corruption by malicious backends, and denial of service triggered by malicious backends: blkfront, netfront, scsifront and the gntalloc driver are testing whether a grant reference is still in use. If this is not the case, they assume that a following removal of the granted access will always succeed, which is not true in case the backend has mapped the granted page between those two operations. As a result the backend can keep access to the memory page of the guest no matter how the page will be used after the frontend I/O has finished. The xenbus driver has a similar problem, as it doesn't check the success of removing the granted access of a shared ring buffer. blkfront: CVE-2022-23036 netfront: CVE-2022-23037 scsifront: CVE-2022-23038 gntalloc: CVE-2022-23039 xenbus: CVE-2022-23040 blkfront, netfront, scsifront, usbfront, dmabuf, xenbus, 9p, kbdfront, and pvcalls are using a functionality to delay freeing a grant reference until it is no longer in use, but the freeing of the related data page is not synchronized with dropping the granted access. As a result the backend can keep access to the memory page even after it has been freed and then re-used for a different purpose. CVE-2022-23041 netfront will fail a BUG_ON() assertion if it fails to revoke access in the rx path. This will result in a Denial of Service (DoS) situation of the guest which can be triggered by the backend. CVE-2022-23042
{
"affected": [],
"aliases": [
"CVE-2022-23036"
],
"database_specific": {
"cwe_ids": [
"CWE-362"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2022-03-10T20:15:00Z",
"severity": "HIGH"
},
"details": "Linux PV device frontends vulnerable to attacks by backends T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Several Linux PV device frontends are using the grant table interfaces for removing access rights of the backends in ways being subject to race conditions, resulting in potential data leaks, data corruption by malicious backends, and denial of service triggered by malicious backends: blkfront, netfront, scsifront and the gntalloc driver are testing whether a grant reference is still in use. If this is not the case, they assume that a following removal of the granted access will always succeed, which is not true in case the backend has mapped the granted page between those two operations. As a result the backend can keep access to the memory page of the guest no matter how the page will be used after the frontend I/O has finished. The xenbus driver has a similar problem, as it doesn\u0027t check the success of removing the granted access of a shared ring buffer. blkfront: CVE-2022-23036 netfront: CVE-2022-23037 scsifront: CVE-2022-23038 gntalloc: CVE-2022-23039 xenbus: CVE-2022-23040 blkfront, netfront, scsifront, usbfront, dmabuf, xenbus, 9p, kbdfront, and pvcalls are using a functionality to delay freeing a grant reference until it is no longer in use, but the freeing of the related data page is not synchronized with dropping the granted access. As a result the backend can keep access to the memory page even after it has been freed and then re-used for a different purpose. CVE-2022-23041 netfront will fail a BUG_ON() assertion if it fails to revoke access in the rx path. This will result in a Denial of Service (DoS) situation of the guest which can be triggered by the backend. CVE-2022-23042",
"id": "GHSA-32qq-4q5r-h4xr",
"modified": "2022-03-18T00:01:19Z",
"published": "2022-03-11T00:02:02Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-23036"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2022/07/msg00000.html"
},
{
"type": "WEB",
"url": "https://xenbits.xenproject.org/xsa/advisory-396.txt"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
Mitigation
In languages that support it, use synchronization primitives. Only wrap these around critical code to minimize the impact on performance.
Mitigation
Use thread-safe capabilities such as the data access abstraction in Spring.
Mitigation
- Minimize the usage of shared resources in order to remove as much complexity as possible from the control flow and to reduce the likelihood of unexpected conditions occurring.
- Additionally, this will minimize the amount of synchronization necessary and may even help to reduce the likelihood of a denial of service where an attacker may be able to repeatedly trigger a critical section (CWE-400).
Mitigation
When using multithreading and operating on shared variables, only use thread-safe functions.
Mitigation
Use atomic operations on shared variables. Be wary of innocent-looking constructs such as "x++". This may appear atomic at the code layer, but it is actually non-atomic at the instruction layer, since it involves a read, followed by a computation, followed by a write.
Mitigation
Use a mutex if available, but be sure to avoid related weaknesses such as CWE-412.
Mitigation
Avoid double-checked locking (CWE-609) and other implementation errors that arise when trying to avoid the overhead of synchronization.
Mitigation
Disable interrupts or signals over critical parts of the code, but also make sure that the code does not go into a large or infinite loop.
Mitigation
Use the volatile type modifier for critical variables to avoid unexpected compiler optimization or reordering. This does not necessarily solve the synchronization problem, but it can help.
Mitigation MIT-17
Strategy: Environment Hardening
Run your code using the lowest privileges that are required to accomplish the necessary tasks [REF-76]. If possible, create isolated accounts with limited privileges that are only used for a single task. That way, a successful attack will not immediately give the attacker access to the rest of the software or its environment. For example, database applications rarely need to run as the database administrator, especially in day-to-day operations.
CAPEC-26: Leveraging Race Conditions
The adversary targets a race condition occurring when multiple processes access and manipulate the same resource concurrently, and the outcome of the execution depends on the particular order in which the access takes place. The adversary can leverage a race condition by "running the race", modifying the resource and modifying the normal execution flow. For instance, a race condition can occur while accessing a file: the adversary can trick the system by replacing the original file with their version and cause the system to read the malicious file.
CAPEC-29: Leveraging Time-of-Check and Time-of-Use (TOCTOU) Race Conditions
This attack targets a race condition occurring between the time of check (state) for a resource and the time of use of a resource. A typical example is file access. The adversary can leverage a file access race condition by "running the race", meaning that they would modify the resource between the first time the target program accesses the file and the time the target program uses the file. During that period of time, the adversary could replace or modify the file, causing the application to behave unexpectedly.