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6 vulnerabilities by The NetBSD Foundation
CVE-2026-57843 (GCVE-0-2026-57843)
Vulnerability from nvd – Published: 2026-09-11 13:50 – Updated: 2026-09-18 17:23 X_Open Source
VLAI
EPSS
VEX
Title
NetBSD mm_open() PK_KMEM Flag Kernel Pointer Information Disclosure
Summary
NetBSD contains an information disclosure vulnerability in mm_open() within sys/dev/mm.c that allows unprivileged local users to obtain real kernel virtual addresses by opening world-accessible devices such as /dev/null or /dev/zero, which incorrectly receive the PK_KMEM process flag. Attackers can exploit this misconfigured flag to bypass the CANSEE_KPTR obfuscation mechanism and read kernel virtual addresses for sensitive kernel structures including struct proc, kauth_cred, filedesc, and vmspace via sysctl KERN_PROC queries.
Severity
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-18 17:12 UTC
CWE
- CWE-732 - Incorrect Permission Assignment for Critical Resource
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://gnats.netbsd.org/60373 | vendor-advisorypatch |
| https://www.vulncheck.com/advisories/netbsd-mm-op… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The NetBSD Foundation | NetBSD |
Affected:
9.0 , < 9.5
(custom)
Affected: 10.0 , ≤ 10.1 (custom) |
Date Public
2026-06-26 00:00
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CVE-2026-57842 (GCVE-0-2026-57842)
Vulnerability from nvd – Published: 2026-09-11 13:48 – Updated: 2026-09-11 14:56 X_Open Source
VLAI
EPSS
VEX
Title
NetBSD COMPAT_NETBSD32 Double Free / Use-After-Free via recvmsg() msg_iovlen
Summary
NetBSD contains a use-after-free and double-free vulnerability in msg_recv_copyin() within the COMPAT_NETBSD32 compatibility layer due to a missing return statement before the cleanup label on the success path. Any local user able to execute a 32-bit binary on a 64-bit NetBSD system can trigger a kernel panic or memory corruption by calling recvmsg() with msg_iovlen between 9 and IOV_MAX, causing the kernel to access a freed iovec buffer and subsequently free the same allocation a second time.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-11 14:56 UTC
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://gnats.netbsd.org/60373 | vendor-advisorypatch |
| https://www.vulncheck.com/advisories/netbsd-compa… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The NetBSD Foundation | NetBSD |
Affected:
8.0 , ≤ 8.3
(custom)
Affected: 9.0 , < 9.5 (custom) Affected: 10.0 , ≤ 10.1 (custom) |
Date Public
2026-06-26 00:00
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CVE-2026-53996 (GCVE-0-2026-53996)
Vulnerability from nvd – Published: 2026-08-12 12:42 – Updated: 2026-08-14 16:50
VLAI
EPSS
VEX
Title
NetBSD hdaudio(4) Driver Privilege Bypass Use-After-Free via HDAUDIO_FGRP_SETCONFIG ioctl
Summary
NetBSD's hdaudio(4) driver in sys/dev/hdaudio/hdaudio.c contains a missing access control vulnerability that allows unprivileged local attackers to invoke the HDAUDIO_FGRP_SETCONFIG ioctl without elevated permissions by exploiting the absence of an access check on /dev/hdaudioN device nodes. Attackers can repeatedly issue HDAUDIO_FGRP_SETCONFIG from one thread while keeping DMA and IRQs live from a second thread to trigger a use-after-free race condition in hdafg_detach() between stream_stop() and stream_disestablish(), where a latched DMA interrupt dereferences a freed callback pointer, resulting in outcomes ranging from audio-subsystem denial of service and kernel panic to potential local kernel privilege escalation.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-12 15:24 UTC
CWE
- CWE-862 - Missing Authorization
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://gist.github.com/n4sm/c9683ca728ecfada6c72… | technical-description |
| https://gnats.netbsd.org/60492 | issue-tracking |
| https://cvsweb.NetBSD.org/bsdweb.cgi/src/sys/dev/… | patch |
| https://www.vulncheck.com/advisories/netbsd-hdaud… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The NetBSD Foundation | NetBSD |
Affected:
0 , ≤ 11
(custom)
cpe:2.3:o:netbsd:netbsd:*:*:*:*:*:*:*:* |
Date Public
2026-08-12 00:00
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CVE-2026-57843 (GCVE-0-2026-57843)
Vulnerability from cvelistv5 – Published: 2026-09-11 13:50 – Updated: 2026-09-18 17:23 X_Open Source
VLAI
EPSS
VEX
Title
NetBSD mm_open() PK_KMEM Flag Kernel Pointer Information Disclosure
Summary
NetBSD contains an information disclosure vulnerability in mm_open() within sys/dev/mm.c that allows unprivileged local users to obtain real kernel virtual addresses by opening world-accessible devices such as /dev/null or /dev/zero, which incorrectly receive the PK_KMEM process flag. Attackers can exploit this misconfigured flag to bypass the CANSEE_KPTR obfuscation mechanism and read kernel virtual addresses for sensitive kernel structures including struct proc, kauth_cred, filedesc, and vmspace via sysctl KERN_PROC queries.
Severity
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-18 17:12 UTC
CWE
- CWE-732 - Incorrect Permission Assignment for Critical Resource
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://gnats.netbsd.org/60373 | vendor-advisorypatch |
| https://www.vulncheck.com/advisories/netbsd-mm-op… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The NetBSD Foundation | NetBSD |
Affected:
9.0 , < 9.5
(custom)
Affected: 10.0 , ≤ 10.1 (custom) |
Date Public
2026-06-26 00:00
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CVE-2026-57842 (GCVE-0-2026-57842)
Vulnerability from cvelistv5 – Published: 2026-09-11 13:48 – Updated: 2026-09-11 14:56 X_Open Source
VLAI
EPSS
VEX
Title
NetBSD COMPAT_NETBSD32 Double Free / Use-After-Free via recvmsg() msg_iovlen
Summary
NetBSD contains a use-after-free and double-free vulnerability in msg_recv_copyin() within the COMPAT_NETBSD32 compatibility layer due to a missing return statement before the cleanup label on the success path. Any local user able to execute a 32-bit binary on a 64-bit NetBSD system can trigger a kernel panic or memory corruption by calling recvmsg() with msg_iovlen between 9 and IOV_MAX, causing the kernel to access a freed iovec buffer and subsequently free the same allocation a second time.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-11 14:56 UTC
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://gnats.netbsd.org/60373 | vendor-advisorypatch |
| https://www.vulncheck.com/advisories/netbsd-compa… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The NetBSD Foundation | NetBSD |
Affected:
8.0 , ≤ 8.3
(custom)
Affected: 9.0 , < 9.5 (custom) Affected: 10.0 , ≤ 10.1 (custom) |
Date Public
2026-06-26 00:00
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CVE-2026-53996 (GCVE-0-2026-53996)
Vulnerability from cvelistv5 – Published: 2026-08-12 12:42 – Updated: 2026-08-14 16:50
VLAI
EPSS
VEX
Title
NetBSD hdaudio(4) Driver Privilege Bypass Use-After-Free via HDAUDIO_FGRP_SETCONFIG ioctl
Summary
NetBSD's hdaudio(4) driver in sys/dev/hdaudio/hdaudio.c contains a missing access control vulnerability that allows unprivileged local attackers to invoke the HDAUDIO_FGRP_SETCONFIG ioctl without elevated permissions by exploiting the absence of an access check on /dev/hdaudioN device nodes. Attackers can repeatedly issue HDAUDIO_FGRP_SETCONFIG from one thread while keeping DMA and IRQs live from a second thread to trigger a use-after-free race condition in hdafg_detach() between stream_stop() and stream_disestablish(), where a latched DMA interrupt dereferences a freed callback pointer, resulting in outcomes ranging from audio-subsystem denial of service and kernel panic to potential local kernel privilege escalation.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-12 15:24 UTC
CWE
- CWE-862 - Missing Authorization
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://gist.github.com/n4sm/c9683ca728ecfada6c72… | technical-description |
| https://gnats.netbsd.org/60492 | issue-tracking |
| https://cvsweb.NetBSD.org/bsdweb.cgi/src/sys/dev/… | patch |
| https://www.vulncheck.com/advisories/netbsd-hdaud… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The NetBSD Foundation | NetBSD |
Affected:
0 , ≤ 11
(custom)
cpe:2.3:o:netbsd:netbsd:*:*:*:*:*:*:*:* |
Date Public
2026-08-12 00:00
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