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Vulnerabilities

Vulnerability · CVE-2026-23121

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, 2026 · catalog updated Oct 19, 2026 · Linux Linux

Last checked Nov 5, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-23121. EPSS is 0.11%. Act only if a listed version of Linux Linux is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
None0.0
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.11%
Remediation
Version ranges on file
Affected products
vendor Linux Linux 1b2b03f8e514e4f68e293846ba511a948b80243c <fc8ba17fd3337bd8b1913c30b95df0fee00d8fb7

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:

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Linux Linux 1b2b03f8e514e4f68e293846ba511a948b80243c <fc8ba17fd3337bd8b1913c30b95df0fee00d8fb71b2b03f8e514e4f68e293846ba511a948b80243c <fc8ba17fd3337bd8b1913c30b95df0fee00d8fb7

How to fix CVE-2026-23121

  • Upgrade

    CVE-2026-23121 lists a fix boundary at fc8ba17fd3337bd8b1913c30b95df0fee00d8fb7. Compare the installed build with that boundary before you change production.

  • Version check

    Seen in 1b2b03f8e514e4f68e293846ba511a948b80243c <fc8ba17fd3337bd8b1913c30b95df0fee00d8fb7

  • Advisory

    Open the cve_org record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-23121. EPSS is 0.11%. Act only if a listed version of Linux Linux is installed.

Which versions are affected?

Compare what you have installed with Linux Linux 1b2b03f8e514e4f68e293846ba511a948b80243c <fc8ba17fd3337bd8b1913c30b95df0fee00d8fb7 1b2b03f8e514e4f68e293846ba511a948b80243c <fc8ba17fd3337bd8b1913c30b95df0fee00d8fb7. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.11%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Feb 14, 2026 · EUVD

    Detected

    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_io

  2. Oct 19, 2026 · EUVD

    Updated

    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_io

Sources

  • CVE.orgVulnerability recordCVE-2026-23121

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-23121

    30-day exploitation probability 0.11%

    first.org
  • EUVDVulnerability recordEUVD-2026-5915

    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 0

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 5, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 5, 2026
  • CVE.orgNov 4, 2026
  • EUVDNov 2, 2026