CVE-2026-99245
KEYS: Fix key_reject_and_link() race with keyring restriction
What happened?
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().
Affected software and versions
| Software | Version information | Fixed version |
|---|---|---|
| LinuxLinux | affected: 5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c to < c7956ec99ad0e173720d95de9fa788bb077809f2; affected: 5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c to < 2c3d907dd15f4e30d4c35b9f7a7a5078de6a1b1f; affected: 5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c to < 72f367417a6aee56821d0b0114cfd2b080008b63; affected: 5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c to < 19dfc37c9deefa69dc805d01d35d1f2fd7902e33; affected: 5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c to < 5787887eba0f0979a8c86d03a8e891395d5c24ad; affected: 5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c to < 01835d3a3709be508ae5209f806640336c48e395; affected: 5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c to < 6fc0c818b1cac66003e937c8a0d3bfb23fd3f130; affected: 5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c to < 23a9163cc40b4996ba1e20533b1210a1a0bee416; affected: 5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c to < 0b157166e612b70f98a332b6c7be7eac6f8e9593 | See vendor advisory |
| LinuxLinux | affected: 4.7; unaffected: 0 to < 4.7; unaffected: 5.10.273 to ≤ 5.10.*; unaffected: 5.15.224 to ≤ 5.15.*; unaffected: 6.1.191 to ≤ 6.1.*; unaffected: 6.6.161 to ≤ 6.6.*; unaffected: 6.12.115 to ≤ 6.12.*; unaffected: 6.18.60 to ≤ 6.18.*; unaffected: 7.2.14 to ≤ 7.2.*; unaffected: 7.3.1 to ≤ 7.3.*; unaffected: 7.4-rc1 to ≤ * | See vendor advisory |
Version information comes from the source record and can include unaffected products and exceptions. Distribution packages may contain backported fixes: an older upstream version alone does not prove a server is affected.
Is it being exploited?
This CVE was not listed in the CISA catalogue at our last retrieval. This does not establish that exploitation is absent.
How to respond
- Confirm the product, installed package version, and any configuration requirements in the vendor advisory.
- Follow the vendor’s remediation or workaround guidance in the references below. Structured fixed-version data is unavailable here; the publisher’s description may include a fix or workaround.
- Restart affected services if required, then verify the running version. Known exploitation may warrant investigation as well as patching.
Sources and remediation references
- https://www.cve.org/CVERecord?id=CVE-2026-99245
- https://git.kernel.org/stable/c/c7956ec99ad0e173720d95de9fa788bb077809f2
- https://git.kernel.org/stable/c/2c3d907dd15f4e30d4c35b9f7a7a5078de6a1b1f
- https://git.kernel.org/stable/c/72f367417a6aee56821d0b0114cfd2b080008b63
- https://git.kernel.org/stable/c/19dfc37c9deefa69dc805d01d35d1f2fd7902e33
- https://git.kernel.org/stable/c/5787887eba0f0979a8c86d03a8e891395d5c24ad
- https://git.kernel.org/stable/c/01835d3a3709be508ae5209f806640336c48e395
- https://git.kernel.org/stable/c/6fc0c818b1cac66003e937c8a0d3bfb23fd3f130
- https://git.kernel.org/stable/c/23a9163cc40b4996ba1e20533b1210a1a0bee416
- https://git.kernel.org/stable/c/0b157166e612b70f98a332b6c7be7eac6f8e9593