VulnerabilityPublished 2 Nov 2026

CVE-2026-99220: Linux kernel · asymmetric_keys: reject trust keys without IDs

Source GCVE Database

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Authoritative record:CVE-2026-99220· High

Not known to be exploited · fixed in 889a2293a95f6c2880bf73b67f9b0af23251a128 : patch Linux kernel soon.

Data as of 2 Nov 2026, 19:30 UTC

Severity

High

Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none

Patch: Available – fixed in 889a2293a95f6c2880bf73b67f9b0af23251a128, 57e54b6939c6539d90a81c7e57531901d5991651, 33a078f04e264eb71aa9f209cb334e4010123818 +3

Exploitation evidence

Disclosed: evidence found.
CVE published 2 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 2 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.

ghsa-3f74-mwpq-qqxv

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 3c58b2362ba828ee2970c66c6a6fd7b04fde4413, < 889a2293a95f6c2880bf73b67f9b0af23251a128	Fixed in 889a2293a95f6c2880bf73b67f9b0af23251a128
LinuxLinux	Affected ≥ 3c58b2362ba828ee2970c66c6a6fd7b04fde4413, < 57e54b6939c6539d90a81c7e57531901d5991651	Fixed in 57e54b6939c6539d90a81c7e57531901d5991651
LinuxLinux	Affected ≥ 3c58b2362ba828ee2970c66c6a6fd7b04fde4413, < 33a078f04e264eb71aa9f209cb334e4010123818	Fixed in 33a078f04e264eb71aa9f209cb334e4010123818
LinuxLinux	Affected ≥ 3c58b2362ba828ee2970c66c6a6fd7b04fde4413, < 7f0728ba89624e25df2bb80ff59bbfb545060935	Fixed in 7f0728ba89624e25df2bb80ff59bbfb545060935
LinuxLinux	Affected ≥ 3c58b2362ba828ee2970c66c6a6fd7b04fde4413, < 2a40bdd4409567de4c2a141ac66439dc238af752	Fixed in 2a40bdd4409567de4c2a141ac66439dc238af752
LinuxLinux	Affected ≥ 3c58b2362ba828ee2970c66c6a6fd7b04fde4413, < 1aa0c7aa4c2554a5b6d74ae1924508ca4718234b	Fixed in 1aa0c7aa4c2554a5b6d74ae1924508ca4718234b

AI-suggested

A fix is available that rejects asymmetric restriction keys without key IDs, preventing the NULL pointer dereference. Users should apply the official kernel update that includes this patch. No other mitigation is indicated.

Description

A vulnerability in the Linux kernel's asymmetric_keys subsystem allows unprivileged users to trigger a NULL pointer dereference, causing a kernel panic. This occurs because the PKCS#8 parser leaves the asym_key_ids payload empty, and the kernel code dereferences this slot unconditionally when processing PKCS#8 keys with key_or_keyring restrictions. The flaw has been resolved by rejecting asymmetric restriction keys without key IDs, as PKCS#8 private keys cannot validly identify trust anchors.

References

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