Vulnerability in Linux

[ Description ]Official description

In the Linux kernel, the following vulnerability has been resolved: KEYS: Fix key_reject_and_link() race with keyring restriction The restrict_link check in key_reject_and_link() is done before taking the keyring semaphore, racing with a concurrent keyring_restrict() that installs the restriction while holding the semaphore in write mode. Move the check to after __key_link_lock(), so it is done under the semaphore, matching the pattern used in __key_create_or_update().

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund2 Nov 2026WID-SEC-2026-4302

  Linux Kernel: Multiple vulnerabilities allow an unspecified attack Translated from German

  Risk mediumCVE-2026-99237CVE-2026-99264CVE-2026-99220+50 more CVEs

[ References ]References

• git.kernel.org/stable/c/01835d3a3709be508ae5209f806640336c48e395
• git.kernel.org/stable/c/0b157166e612b70f98a332b6c7be7eac6f8e9593
• git.kernel.org/stable/c/19dfc37c9deefa69dc805d01d35d1f2fd7902e33
• git.kernel.org/stable/c/23a9163cc40b4996ba1e20533b1210a1a0bee416
• git.kernel.org/stable/c/2c3d907dd15f4e30d4c35b9f7a7a5078de6a1b1f
• git.kernel.org/stable/c/5787887eba0f0979a8c86d03a8e891395d5c24ad
• git.kernel.org/stable/c/6fc0c818b1cac66003e937c8a0d3bfb23fd3f130
• git.kernel.org/stable/c/72f367417a6aee56821d0b0114cfd2b080008b63
• git.kernel.org/stable/c/c7956ec99ad0e173720d95de9fa788bb077809f2