VulnerabilityPublished 17 Sep 2026Updated 30 Oct 2026

CVE-2026-90138: Linux kernel · vsock: don't check the listener's sk_err in vsock_accept()

Source GCVE Database

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Authoritative record:CVE-2026-90138· Medium

Not known to be exploited · fixed in c99d12052f663d9914bc944302fee5a1d50d8ca5 : update Linux kernel when convenient.

Data as of 30 Oct 2026, 19:05 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 c99d12052f663d9914bc944302fee5a1d50d8ca5, c5a75d37c21e558cc6fad1597e732ead30745eed, b8c899cf5e7be29840a172c183dedd8d3e7a0287 +3

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-r47p-87c6-4p5v

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ d021c344051af91f42c5ba9fdedc176740cbd238, < c99d12052f663d9914bc944302fee5a1d50d8ca5	Fixed in c99d12052f663d9914bc944302fee5a1d50d8ca5
LinuxLinux	Affected ≥ d021c344051af91f42c5ba9fdedc176740cbd238, < c5a75d37c21e558cc6fad1597e732ead30745eed	Fixed in c5a75d37c21e558cc6fad1597e732ead30745eed
LinuxLinux	Affected ≥ d021c344051af91f42c5ba9fdedc176740cbd238, < b8c899cf5e7be29840a172c183dedd8d3e7a0287	Fixed in b8c899cf5e7be29840a172c183dedd8d3e7a0287
LinuxLinux	Affected ≥ d021c344051af91f42c5ba9fdedc176740cbd238, < 64348c55dd7596ca2c033dcd102af44bdd7e8acd	Fixed in 64348c55dd7596ca2c033dcd102af44bdd7e8acd
LinuxLinux	Affected ≥ d021c344051af91f42c5ba9fdedc176740cbd238, < 491b368a0c6e5f28b615a50b0d384f5c25fde2a7	Fixed in 491b368a0c6e5f28b615a50b0d384f5c25fde2a7
LinuxLinux	Affected ≥ d021c344051af91f42c5ba9fdedc176740cbd238, < 36e5fa009f98a4edbe1783ac11c0df672b224742	Fixed in 36e5fa009f98a4edbe1783ac11c0df672b224742

AI-suggested

A fix has been implemented in the Linux kernel to remove the sk_err check in vsock_accept(), preventing rejection of valid connections and resource leaks. Users should apply the official kernel update containing this fix once available. No other mitigation is indicated.

Description

A vulnerability in the Linux kernel's vsock subsystem causes vsock_accept() to incorrectly reject valid incoming connections due to stale error states from previous failed connection attempts. This leads to resource leaks on certain transports because child sockets created for new connections are never freed.

References

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