VulnerabilityPublished 3 Nov 2026

CVE-2026-99245: Linux kernel · KEYS: Fix key_reject_and_link() race with keyring restriction

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in c7956ec99ad0e173720d95de9fa788bb077809f2 : update Linux kernel when convenient.

Data as of 3 Nov 2026, 11:28 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

Thin evidence

One scorer or none

Patch: Available – fixed in c7956ec99ad0e173720d95de9fa788bb077809f2, 5787887eba0f0979a8c86d03a8e891395d5c24ad, 01835d3a3709be508ae5209f806640336c48e395 +5

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 3 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c, < c7956ec99ad0e173720d95de9fa788bb077809f2	Fixed in c7956ec99ad0e173720d95de9fa788bb077809f2
LinuxLinux	Affected ≥ 5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c, < 5787887eba0f0979a8c86d03a8e891395d5c24ad	Fixed in 5787887eba0f0979a8c86d03a8e891395d5c24ad
LinuxLinux	Affected ≥ 5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c, < 01835d3a3709be508ae5209f806640336c48e395	Fixed in 01835d3a3709be508ae5209f806640336c48e395
LinuxLinux	Affected ≥ 5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c, < 72f367417a6aee56821d0b0114cfd2b080008b63	Fixed in 72f367417a6aee56821d0b0114cfd2b080008b63
LinuxLinux	Affected ≥ 5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c, < 23a9163cc40b4996ba1e20533b1210a1a0bee416	Fixed in 23a9163cc40b4996ba1e20533b1210a1a0bee416
LinuxLinux	Affected ≥ 5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c, < 19dfc37c9deefa69dc805d01d35d1f2fd7902e33	Fixed in 19dfc37c9deefa69dc805d01d35d1f2fd7902e33

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().

References

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