VulnerabilityPublished 19 Aug 2025Updated 5 Nov 2026

CVE-2025-38565: Linux kernel · perf/core: Exit early on perf_mmap() fail

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in f41e9eba77bf97626e04296dc5677d02816d2432 : update Linux kernel when convenient.

Data as of 5 Nov 2026, 21:34 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, 2026-11-05.

Patch

Available – fixed in f41e9eba77bf97626e04296dc5677d02816d2432, de85e72598d89880a02170a1cbc27b35a7d978a9, 92043120a2e992800580855498ab8507e1b22db9 +6

Exploitation evidence

Disclosed: evidence found.
CVE published 19 Aug 2025
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 ≥ 1e0fb9ec679c9273a641f1d6f3d25ea47baef2bb, < f41e9eba77bf97626e04296dc5677d02816d2432	Fixed in f41e9eba77bf97626e04296dc5677d02816d2432
LinuxLinux	Affected ≥ 1e0fb9ec679c9273a641f1d6f3d25ea47baef2bb, < de85e72598d89880a02170a1cbc27b35a7d978a9	Fixed in de85e72598d89880a02170a1cbc27b35a7d978a9
LinuxLinux	Affected ≥ 1e0fb9ec679c9273a641f1d6f3d25ea47baef2bb, < 92043120a2e992800580855498ab8507e1b22db9	Fixed in 92043120a2e992800580855498ab8507e1b22db9
LinuxLinux	Affected ≥ 1e0fb9ec679c9273a641f1d6f3d25ea47baef2bb, < 07091aade394f690e7b655578140ef84d0e8d7b0	Fixed in 07091aade394f690e7b655578140ef84d0e8d7b0
LinuxLinux	Affected ≥ 1e0fb9ec679c9273a641f1d6f3d25ea47baef2bb, < 163b0d1a209fe0df5476c1df2330ca12b55abf92	Fixed in 163b0d1a209fe0df5476c1df2330ca12b55abf92
LinuxLinux	Affected ≥ 1e0fb9ec679c9273a641f1d6f3d25ea47baef2bb, < 27d44145bd576bbef9bf6165bcd78128ec3e6cbd	Fixed in 27d44145bd576bbef9bf6165bcd78128ec3e6cbd

Description

In the Linux kernel, the following vulnerability has been resolved: perf/core: Exit early on perf_mmap() fail When perf_mmap() fails to allocate a buffer, it still invokes the event_mapped() callback of the related event. On X86 this might increase the perf_rdpmc_allowed reference counter. But nothing undoes this as perf_mmap_close() is never called in this case, which causes another reference count leak. Return early on failure to prevent that.

References

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