VulnerabilityPublished 25 Jul 2026Updated 6 Nov 2026

CVE-2026-64370: Linux kernel · posix-cpu-timers: Fix pid refcount leak in do_cpu_nanosleep() error path

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in eb4cec29a78334d09bcfb41c0660cdd62ba05843 : update Linux kernel when convenient.

Data as of 6 Nov 2026, 17:04 UTC

Severity

Unrated

Rated by Threat Radar · 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, 2026-11-06.

Patch

Available – fixed in eb4cec29a78334d09bcfb41c0660cdd62ba05843, e5ffc638faf5dc7d9dc85c9a95e10bf97442e0c0, d605d00085adc3fddf67de01dc2a44aebf1a3fb5 +5

Exploitation evidence

Disclosed: evidence found.
CVE published 25 Jul 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 6 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 ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < eb4cec29a78334d09bcfb41c0660cdd62ba05843	Fixed in eb4cec29a78334d09bcfb41c0660cdd62ba05843
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < e5ffc638faf5dc7d9dc85c9a95e10bf97442e0c0	Fixed in e5ffc638faf5dc7d9dc85c9a95e10bf97442e0c0
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < d605d00085adc3fddf67de01dc2a44aebf1a3fb5	Fixed in d605d00085adc3fddf67de01dc2a44aebf1a3fb5
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < afed3cdc1cca133f804fcf57ff228974f424b23a	Fixed in afed3cdc1cca133f804fcf57ff228974f424b23a
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 7776f9226e99eb49d97492b0b445027cfcb189da	Fixed in 7776f9226e99eb49d97492b0b445027cfcb189da
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 87bd2ad568e15b90d5f7d4bcd70342d05dad649c	Fixed in 87bd2ad568e15b90d5f7d4bcd70342d05dad649c

Description

In the Linux kernel, the following vulnerability has been resolved: posix-cpu-timers: Fix pid refcount leak in do_cpu_nanosleep() error path In do_cpu_nanosleep(), posix_cpu_timer_create() takes a pid reference via get_pid() and stores it in timer.it.cpu.pid. If the subsequent posix_cpu_timer_set() call fails, the function returns immediately without calling posix_cpu_timer_del() to release the pid reference, causing a leak. Fix it by calling posix_cpu_timer_del() before the unlock-and-return on the error path, consistent with the other exit paths in the same function.

References

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