Race condition in Linux kernel keyring restriction check
Key facts
- Attack vector
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- Privileges required
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- User interaction
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- Attack complexity
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- Impact type
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- Confidentiality · integrity · availability
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- Fix status
- Partial Red Hat: 6 without a fix
No CVSS vector from any source. Fix status from CNA and Red Hat.
Summary
The Linux kernel is affected from 4.7 in its KEYS subsystem. In key_reject_and_link(), the restrict_link check runs before the keyring semaphore is taken, so it can race with a concurrent keyring_restrict() that installs the restriction. The fix moves the check under the semaphore, matching the pattern used in __key_create_or_update().
Written with Claude Haiku 5.5 from the sources below · 2026-11-04
Description from the CNA
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().
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 4.7 and later | 5.10.273, 5.15.224, 6.1.191, 6.6.161, 6.12.115, 6.18.60, 7.2.14, 7.3.1, 7.4-rc1 | Patch available | CNA |
- Linux VendorLinux Affected 4.7 and later Fixed in 5.10.273, 5.15.224, 6.1.191, 6.6.161, 6.12.115, 6.18.60, 7.2.14, 7.3.1, 7.4-rc1 Patch available CNA
Remediation
Fixed Linux kernel releases are 5.10.273, 5.15.224, 6.1.191, 6.6.161, 6.12.115, 6.18.60, 7.2.14, 7.3.1 and 7.4-rc1. Red Hat lists Red Hat Enterprise Linux 6 as affected with no fix planned, and Red Hat Enterprise Linux 8, 9 and 10 and Red Hat OpenShift Container Platform 4 and 5 as affected with plan none available.
Written with Claude Haiku 5.5 from the sources below · 2026-11-04
- Fix · CNA Linux (Linux) Fixed in 5.10.273, 5.15.224, 6.1.191, 6.6.161, 6.12.115, 6.18.60, 7.2.14, 7.3.1, 7.4-rc1
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 5 | Affected | No fix yet: Fix deferred |
Not affected: 1 product
- Red Hat Enterprise Linux 7
Timeline
- 2026-11-03 Threatist record created from CVE-2026-99245
- 2026-11-03 Alias added: GHSA-g5g7-wfj6-x845
- 2026-11-03 Fix available: Linux/Linux@0b157166e612b70f98a332b6c7be7eac6f8e9593, Linux/[email protected] · CNA
- 2026-11-03 1 new reference · CNA
- 2026-11-04 Affected versions changed · Red Hat
- 2026-11-04 CVSS score added · Red Hat
References
Other 9
- 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
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Sources
- CVE-2026-99245 · CVE Program
- CVE-2026-99245 · NVD
- FIRST EPSS
- GHSA-g5g7-wfj6-x845 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-99245 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences