VulnerabilityPublished 3 Nov 2026

CVE-2026-99249: Linux kernel · pid_namespace: make zap_pid_ns_processes() freezable

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in e8dafad7de9ede813af2d48cc04b7c88fef16682 : update Linux kernel when convenient.

Data as of 3 Nov 2026, 11:43 UTC

Severity

Medium

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

Thin evidence

One scorer or none

Patch: Available – fixed in e8dafad7de9ede813af2d48cc04b7c88fef16682, 81933038f5e273d17ed22792f906889393b204c5, 064a6761d6f6ac55d090d3eaca649577ee736713 +3

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 ≥ 3eb07c8c8adb6f0572baba844ba2d9e501654316, < e8dafad7de9ede813af2d48cc04b7c88fef16682	Fixed in e8dafad7de9ede813af2d48cc04b7c88fef16682
LinuxLinux	Affected ≥ 3eb07c8c8adb6f0572baba844ba2d9e501654316, < 81933038f5e273d17ed22792f906889393b204c5	Fixed in 81933038f5e273d17ed22792f906889393b204c5
LinuxLinux	Affected ≥ 3eb07c8c8adb6f0572baba844ba2d9e501654316, < 064a6761d6f6ac55d090d3eaca649577ee736713	Fixed in 064a6761d6f6ac55d090d3eaca649577ee736713
LinuxLinux	Affected ≥ 3eb07c8c8adb6f0572baba844ba2d9e501654316, < 7deb5770840339fe88755bf27b92f74edc26ee87	Fixed in 7deb5770840339fe88755bf27b92f74edc26ee87
LinuxLinux	Affected ≥ 3eb07c8c8adb6f0572baba844ba2d9e501654316, < 4b47107f1a80c809c80093e872bcaccdbae13db4	Fixed in 4b47107f1a80c809c80093e872bcaccdbae13db4
LinuxLinux	Affected ≥ 3eb07c8c8adb6f0572baba844ba2d9e501654316, < 2e10b8a74f55b5aae33db105d3e2d3ae759c865a	Fixed in 2e10b8a74f55b5aae33db105d3e2d3ae759c865a

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A fix is available and has been applied in multiple Linux kernel commits. Users and administrators should update their Linux kernel to a version that includes these fixes. No additional mitigation actions are required beyond applying the official patch.

Description

CVE-2026-99249 is a Linux kernel vulnerability involving the pid namespace subsystem. The function zap_pid_ns_processes() was not freezable, causing indefinite waits when the init process of a pid namespace exits if traced zombies were not reaped by an external tracer. This prevented user space processes from freezing properly, leading to failures in suspend attempts. The issue was notably triggered by Chromium-based browsers using crashpad for crash dumps. The vulnerability has been fixed in several Linux kernel commits.

Impact

The vulnerability causes failures in freezing user space processes, which can prevent system suspend operations from completing successfully. This can lead to system instability or inability to suspend/resume properly. The issue affects environments where pid namespaces are used and traced zombies are not reaped, such as Chromium-based browsers using crashpad for crash dumps. There is no indication of privilege escalation or code execution impact. No known exploits in the wild have been reported.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 3 Nov 2026, 11:43 UTC

Technical details

References

Community reviews

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