VulnerabilityPublished 17 Sep 2026Updated 30 Oct 2026

CVE-2026-92520: Linux kernel · bpf: Zero queue and stack outputs on lock failure

Source GCVE Database

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Authoritative record:CVE-2026-92520· Medium

Not known to be exploited · fixed in e2396b8a562073787e627a5f483f1bc5c452fa6a : update Linux kernel when convenient.

Data as of 30 Oct 2026, 18:18 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 e2396b8a562073787e627a5f483f1bc5c452fa6a, a6090eeb289c5fa45f7b629befac2bd3c19a6dae, 6468e8ac026b44ae2a78114b80f9d1b9164d0f6c +8

Exploitation evidence

Disclosed: evidence found.
CVE published 17 Sep 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 30 Oct 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-fc4c-4457-gw27

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected >=6.1.56 <6.1.191 >=5.4.258 <5.5 >=5.10.198 <5.11 >=5.15.134 <5.16 >=6.5.6 <6.6	Fixed in e2396b8a562073787e627a5f483f1bc5c452fa6a a6090eeb289c5fa45f7b629befac2bd3c19a6dae 6468e8ac026b44ae2a78114b80f9d1b9164d0f6c 1534c4bff3aaca19c4c9a82f93e9b81f7c983de3 23b4bcc79bab5285275912b94e98c286f281de75 7ac6e1ae41a09f1dd4baeeff1d028ae49ee01232 6.6 6.1.191 5.16 5.11 5.5
LinuxLinux	Affected =6.6	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel to clear the output buffer before returning the -EBUSY error on lock acquisition failure. Users should apply the official kernel updates that include this fix to mitigate the vulnerability.

Description

A vulnerability in the Linux kernel's BPF subsystem involves queue and stack pop/peek helpers that may return uninitialized output buffers on lock acquisition failure. This occurs because the verifier expects these helpers to initialize the output buffer, but when a lock acquisition fails, the buffer is not cleared, potentially exposing uninitialized stack contents to BPF programs. The issue has been resolved by ensuring the output buffer is cleared before returning the error code.

References

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