CVE-2023-53824 - Vulnerability Details

- netlink: annotate lockless accesses to nlk->max_recvmsg_len

Description

In the Linux kernel, the following vulnerability has been resolved:

netlink: annotate lockless accesses to nlk->max_recvmsg_len

syzbot reported a data-race in data-race in netlink_recvmsg() [1]

Indeed, netlink_recvmsg() can be run concurrently,
and netlink_dump() also needs protection.

[1]
BUG: KCSAN: data-race in netlink_recvmsg / netlink_recvmsg

read to 0xffff888141840b38 of 8 bytes by task 23057 on cpu 0:
netlink_recvmsg+0xea/0x730 net/netlink/af_netlink.c:1988
sock_recvmsg_nosec net/socket.c:1017 [inline]
sock_recvmsg net/socket.c:1038 [inline]
__sys_recvfrom+0x1ee/0x2e0 net/socket.c:2194
__do_sys_recvfrom net/socket.c:2212 [inline]
__se_sys_recvfrom net/socket.c:2208 [inline]
__x64_sys_recvfrom+0x78/0x90 net/socket.c:2208
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd

write to 0xffff888141840b38 of 8 bytes by task 23037 on cpu 1:
netlink_recvmsg+0x114/0x730 net/netlink/af_netlink.c:1989
sock_recvmsg_nosec net/socket.c:1017 [inline]
sock_recvmsg net/socket.c:1038 [inline]
____sys_recvmsg+0x156/0x310 net/socket.c:2720
___sys_recvmsg net/socket.c:2762 [inline]
do_recvmmsg+0x2e5/0x710 net/socket.c:2856
__sys_recvmmsg net/socket.c:2935 [inline]
__do_sys_recvmmsg net/socket.c:2958 [inline]
__se_sys_recvmmsg net/socket.c:2951 [inline]
__x64_sys_recvmmsg+0xe2/0x160 net/socket.c:2951
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x0000000000000000 -> 0x0000000000001000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 23037 Comm: syz-executor.2 Not tainted 6.3.0-rc4-syzkaller-00195-g5a57b48fdfcb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023

Published: 2025-12-09

Score: 7.0 High

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`9063e21fb026c4966fc93261c18322214f9835eb`	affected	< 05c9e3fc93b02d18c3ab258d43350a6d44b40bbd
`9063e21fb026c4966fc93261c18322214f9835eb`	affected	< 7cff4103be7c402ecc3e7bf8f95a64089e3c91b8
`9063e21fb026c4966fc93261c18322214f9835eb`	affected	< e3bcf2a77060bea4d8d09cb09d92c7056f07df5a
`9063e21fb026c4966fc93261c18322214f9835eb`	affected	< fc4ba13013ddaea8b11b88fd52b35449e2d9cf85
`9063e21fb026c4966fc93261c18322214f9835eb`	affected	< a1865f2e7d10dde00d35a2122b38d2e469ae67ed

Linux

affected

Version	Status	Constraints
`3.15`	affected	—
`0`	unaffected	< 3.15
`5.10.218`	unaffected	≤ 5.10.*
`5.15.160`	unaffected	≤ 5.15.*
`6.1.24`	unaffected	≤ 6.1.*
`6.2.11`	unaffected	≤ 6.2.*
`6.3`	unaffected	≤ *

No data.

No data available yet.

Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

No CVSS v4.0

Attack Vector Local

Attack Complexity High

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00022.

Key SSVC decision points have not yet been added.

References

Link	Providers
https://git.kernel.org/stable/c/05c9e3fc93b02d18c3ab258d43350a6d44b40bbd
https://git.kernel.org/stable/c/7cff4103be7c402ecc3e7bf8f95a64089e3c91b8
https://git.kernel.org/stable/c/a1865f2e7d10dde00d35a2122b38d2e469ae67ed
https://git.kernel.org/stable/c/e3bcf2a77060bea4d8d09cb09d92c7056f07df5a
https://git.kernel.org/stable/c/fc4ba13013ddaea8b11b88fd52b35449e2d9cf85
https://lore.kernel.org/linux-cve-announce/2025120951-CVE-2023-53824-229c@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2023-53824
https://www.cve.org/CVERecord?id=CVE-2023-53824

History

Wed, 10 Dec 2025 00:15:00 +0000

Type	Values Removed	Values Added
References		https://lore.kernel.org/linux-cve-announce/2025120951-CVE-2023-53824-229c@gregkh/T https://nvd.nist.gov/vuln/detail/CVE-2023-53824 https://www.cve.org/CVERecord?id=CVE-2023-53824
Metrics	threat_severity `None`	cvssV3_1 `{'score': 7.0, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}` threat_severity `Important`

Tue, 09 Dec 2025 02:00:00 +0000

Type	Values Removed	Values Added
Description		In the Linux kernel, the following vulnerability has been resolved: netlink: annotate lockless accesses to nlk->max_recvmsg_len syzbot reported a data-race in data-race in netlink_recvmsg() [1] Indeed, netlink_recvmsg() can be run concurrently, and netlink_dump() also needs protection. [1] BUG: KCSAN: data-race in netlink_recvmsg / netlink_recvmsg read to 0xffff888141840b38 of 8 bytes by task 23057 on cpu 0: netlink_recvmsg+0xea/0x730 net/netlink/af_netlink.c:1988 sock_recvmsg_nosec net/socket.c:1017 [inline] sock_recvmsg net/socket.c:1038 [inline] __sys_recvfrom+0x1ee/0x2e0 net/socket.c:2194 __do_sys_recvfrom net/socket.c:2212 [inline] __se_sys_recvfrom net/socket.c:2208 [inline] __x64_sys_recvfrom+0x78/0x90 net/socket.c:2208 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd write to 0xffff888141840b38 of 8 bytes by task 23037 on cpu 1: netlink_recvmsg+0x114/0x730 net/netlink/af_netlink.c:1989 sock_recvmsg_nosec net/socket.c:1017 [inline] sock_recvmsg net/socket.c:1038 [inline] ____sys_recvmsg+0x156/0x310 net/socket.c:2720 ___sys_recvmsg net/socket.c:2762 [inline] do_recvmmsg+0x2e5/0x710 net/socket.c:2856 __sys_recvmmsg net/socket.c:2935 [inline] __do_sys_recvmmsg net/socket.c:2958 [inline] __se_sys_recvmmsg net/socket.c:2951 [inline] __x64_sys_recvmmsg+0xe2/0x160 net/socket.c:2951 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd value changed: 0x0000000000000000 -> 0x0000000000001000 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 23037 Comm: syz-executor.2 Not tainted 6.3.0-rc4-syzkaller-00195-g5a57b48fdfcb #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Title		netlink: annotate lockless accesses to nlk->max_recvmsg_len
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/05c9e3fc93b02d18c3ab258d43350a6d44b40bbd https://git.kernel.org/stable/c/7cff4103be7c402ecc3e7bf8f95a64089e3c91b8 https://git.kernel.org/stable/c/a1865f2e7d10dde00d35a2122b38d2e469ae67ed https://git.kernel.org/stable/c/e3bcf2a77060bea4d8d09cb09d92c7056f07df5a https://git.kernel.org/stable/c/fc4ba13013ddaea8b11b88fd52b35449e2d9cf85

Subscriptions

Linux Linux Kernel

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2025-12-09T01:29:37.432Z

Updated: 2026-05-11T19:52:14.602Z

Reserved: 2025-12-09T01:27:17.824Z

Link: CVE-2023-53824

Vulnrichment

No data.

NVD

Status : Deferred

Published: 2025-12-09T16:17:21.227

Modified: 2026-04-15T00:35:42.020

Link: CVE-2023-53824

Redhat

Severity : Important

Publid Date: 2025-12-09T00:00:00Z

Links: CVE-2023-53824 - Bugzilla

OpenCVE Enrichment

No data.

Weaknesses

No weakness.

Tracking

Attack Vector Local

Attack Complexity High

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

Subscriptions

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