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CVE-2026-23121

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: mISDN: annotate data-race around dev->work dev->work can re read locklessly in mISDN_read() and mISDN_poll().

Published Feb 14, 2026EPSS 0.14%

Overview

CVE-2026-23121 is a medium-severity vulnerability. It was published on February 14, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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

mISDN: annotate data-race around dev->work

dev->work can re read locklessly in mISDN_read()

and mISDN_poll(). Add READ_ONCE()/WRITE_ONCE() annotations.

BUG: KCSAN: data-race in mISDN_ioctl / mISDN_read

write to 0xffff88812d848280 of 4 bytes by task 10864 on cpu 1:

misdn_add_timer drivers/isdn/mISDN/timerdev.c:175 [inline]

mISDN_ioctl+0x2fb/0x550 drivers/isdn/mISDN/timerdev.c:233

vfs_ioctl fs/ioctl.c:51 [inline]

__do_sys_ioctl fs/ioctl.c:597 [inline]

__se_sys_ioctl+0xce/0x140 fs/ioctl.c:583

__x64_sys_ioctl+0x43/0x50 fs/ioctl.c:583

x64_sys_call+0x14b0/0x3000 arch/x86/include/generated/asm/syscalls_64.h:17

do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]

do_syscall_64+0xd8/0x2c0 arch/x86/entry/syscall_64.c:94

entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88812d848280 of 4 bytes by task 10857 on cpu 0:

mISDN_read+0x1f2/0x470 drivers/isdn/mISDN/timerdev.c:112

do_loop_readv_writev f

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/13f3b3b87068898056db4c79ee67052fbde11d43Refgit.kernel.org/stable/c/7ac345a93af31358e18e9606eb7b354691bf6757Refgit.kernel.org/stable/c/8175dbf174d487afab81e936a862a8d9b8a1ccb6Refgit.kernel.org/stable/c/aa6e33cd74ca4965f2bbcb025e0b672fb0168a69Refgit.kernel.org/stable/c/accc3f8266d2a49881dbcf78c459477f4efa0ff3Refgit.kernel.org/stable/c/d5d99cb9e0839093cd53aa3b28176fce2f820ca0Refgit.kernel.org/stable/c/fc8ba17fd3337bd8b1913c30b95df0fee00d8fb7

How CyberStrike helps

Frequently asked questions

What is CVE-2026-23121?

CVE-2026-23121 is a medium-severity vulnerability. It was published on February 14, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-23121?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-23121?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-23121?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-23121 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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