VulnerabilityPublished 22 Apr 2026Updated 5 Nov 2026

CVE-2026-31480: Linux kernel · tracing: Fix potential deadlock in cpu hotplug with osnoise

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in f278b8ebf7eba2a1699cfc7bf30dd3ef898d60d7 : update Linux kernel when convenient.

Data as of 5 Nov 2026, 22:21 UTC

Severity

Medium

Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-05.

Patch

Available – fixed in f278b8ebf7eba2a1699cfc7bf30dd3ef898d60d7, ef41a85a55022e27cdaebf22a6676910b66f65aa, cf929c21eeed5bd39873fb14bfdfff963fa6f1da +4

Exploitation evidence

Disclosed: evidence found.
CVE published 22 Apr 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 5 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 ≥ bce29ac9ce0bb0b0b146b687ab978378c21e9078, < f278b8ebf7eba2a1699cfc7bf30dd3ef898d60d7	Fixed in f278b8ebf7eba2a1699cfc7bf30dd3ef898d60d7
LinuxLinux	Affected ≥ bce29ac9ce0bb0b0b146b687ab978378c21e9078, < ef41a85a55022e27cdaebf22a6676910b66f65aa	Fixed in ef41a85a55022e27cdaebf22a6676910b66f65aa
LinuxLinux	Affected ≥ bce29ac9ce0bb0b0b146b687ab978378c21e9078, < cf929c21eeed5bd39873fb14bfdfff963fa6f1da	Fixed in cf929c21eeed5bd39873fb14bfdfff963fa6f1da
LinuxLinux	Affected ≥ bce29ac9ce0bb0b0b146b687ab978378c21e9078, < 03474a01c199de17a8e2d39b51df6beb9c76e831	Fixed in 03474a01c199de17a8e2d39b51df6beb9c76e831
LinuxLinux	Affected ≥ bce29ac9ce0bb0b0b146b687ab978378c21e9078, < 7aa095ce7d224308cb6979956f0de8607df93d4f	Fixed in 7aa095ce7d224308cb6979956f0de8607df93d4f
LinuxLinux	Affected ≥ bce29ac9ce0bb0b0b146b687ab978378c21e9078, < 7a41d4633cd2c15eb5ed31e8f3b16910e50a8c9f	Fixed in 7a41d4633cd2c15eb5ed31e8f3b16910e50a8c9f

AI-suggested

A fix is available and has been applied in the Linux kernel. Users running version 5.14 should update to a fixed kernel version containing the patch identified by the listed commit hashes. No additional mitigation is required beyond applying the official fix.

Description

CVE-2026-31480 is a vulnerability in the Linux kernel version 5.14 involving a potential deadlock during CPU hotplug operations when using osnoise. The issue arises from an improper locking order between cpus_read_lock() and mutex_lock(&interface_lock), which can cause a deadlock scenario. The vulnerability has been fixed by swapping the order of these locks.

Impact

The impact is a potential deadlock in the Linux kernel during CPU hotplug operations with osnoise enabled, which could cause system hangs or unresponsiveness. There is no indication of privilege escalation or data corruption. No known exploits in the wild have been reported.

Summary

This vulnerability in Linux kernel 5.14 involves a potential deadlock triggered during CPU hotplug sequences involving osnoise. The deadlock occurs due to the locking order of cpus_read_lock() and mutex_lock(&interface_lock) being incorrect, leading to a situation where multiple tasks wait indefinitely. The fix involves swapping the order of these locks to prevent the deadlock condition.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 5 Nov 2026, 22:21 UTC

Technical details

References

Community reviews

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