VulnerabilityPublished 28 Oct 2026

CVE-2026-99122: Linux kernel · vsock/vmci: validate packet source for connected sockets

Source GCVE Database

Authoritative record:CVE-2026-99122

Not known to be exploited · fixed in c027f8b429dbb2157fc1b503df196e272d947c89 : update Linux kernel when convenient.

Data as of 28 Oct 2026, 14:13 UTC

Severity

Medium

Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD

Patch: Available – fixed in c027f8b429dbb2157fc1b503df196e272d947c89, ad9a7da3fa39c2d616ec0dd3cf6e30531d032fe7, 90c423b62ec9be08177f74b07a47937ca8d2035b

Exploitation evidence

Disclosed: evidence found.
CVE published 28 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: 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 26 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.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, 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-99x3-rpwc-xh78

What to do

Upgrade Linux kernel to c027f8b429dbb2157fc1b503df196e272d947c89, ad9a7da3fa39c2d616ec0dd3cf6e30531d032fe7 or 90c423b62ec9be08177f74b07a47937ca8d2035b.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ d021c344051af91f42c5ba9fdedc176740cbd238, < c027f8b429dbb2157fc1b503df196e272d947c89	Fixed in c027f8b429dbb2157fc1b503df196e272d947c89
LinuxLinux	Affected ≥ d021c344051af91f42c5ba9fdedc176740cbd238, < ad9a7da3fa39c2d616ec0dd3cf6e30531d032fe7	Fixed in ad9a7da3fa39c2d616ec0dd3cf6e30531d032fe7
LinuxLinux	Affected ≥ d021c344051af91f42c5ba9fdedc176740cbd238, < 90c423b62ec9be08177f74b07a47937ca8d2035b	Fixed in 90c423b62ec9be08177f74b07a47937ca8d2035b
LinuxLinux	Affected =3.9	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel to validate packet sources for connected sockets in the vsock/vmci subsystem. Users should apply the official kernel updates that include this patch. No additional mitigation steps are required beyond applying the vendor-provided fix.

Description

A vulnerability in the Linux kernel's vsock/vmci subsystem allows improper validation of packet sources for connected sockets. The fallback socket lookup can select a non-listening socket without verifying the packet's source, potentially causing a reset of a TCP_SYN_SENT socket by an incorrect VMCI context. The fix involves validating the packet source after acquiring socket locks and replying with a reset (RST) to packets failing validation, preserving expected reset behavior.

References

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