CVE-2026-99245: Linux kernel · KEYS: Fix key_reject_and_link() race with keyring restriction
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 5 Nov 2026, 00:01 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
Thin evidence
One scorer or none- EPSS
- 0.2% chance of exploitation in 30 days – higher than 13% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 3 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 4 Nov 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.10linuxpkg:deb/ubuntu/linux?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-oraclepkg:deb/ubuntu/linux-oracle?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A fix has been implemented in the Linux kernel by moving the restrict_link check under the keyring semaphore lock. Users should apply the updated kernel versions that include this fix to mitigate the vulnerability.
Description
A race condition vulnerability in the Linux kernel's key management subsystem was fixed by moving a keyring restriction check under a semaphore lock to prevent concurrent modification issues.
References
- ubuntu.com/security/CVE-2026-99245 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-99245 (opens in a new tab)
- git.kernel.org/stable/c/72f367417a6aee56821d0b0114cfd2b080008b63 (opens in a new tab)
- git.kernel.org/stable/c/19dfc37c9deefa69dc805d01d35d1f2fd7902e33 (opens in a new tab)
- git.kernel.org/stable/c/23a9163cc40b4996ba1e20533b1210a1a0bee416 (opens in a new tab)
- git.kernel.org/stable/c/c7956ec99ad0e173720d95de9fa788bb077809f2 (opens in a new tab)
- git.kernel.org/stable/c/01835d3a3709be508ae5209f806640336c48e395 (opens in a new tab)
- git.kernel.org/stable/c/5787887eba0f0979a8c86d03a8e891395d5c24ad (opens in a new tab)
- git.kernel.org/stable/c/2c3d907dd15f4e30d4c35b9f7a7a5078de6a1b1f (opens in a new tab)
- git.kernel.org/stable/c/6fc0c818b1cac66003e937c8a0d3bfb23fd3f130 (opens in a new tab)