VulnerabilityPublished 28 Oct 2026

CVE-2026-99128: Linux kernel · sctp: validate chunk length in the inqueue parser

Source GCVE Database

Authoritative record:CVE-2026-99128

Not known to be exploited · fixed in 40507f59f230dcf60ae13cb48d34f8c6e9f40659 : patch Linux kernel soon.

Data as of 28 Oct 2026, 14:13 UTC

Severity

High

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

Patch: Available – fixed in 40507f59f230dcf60ae13cb48d34f8c6e9f40659, 9ac57e4c62e93c287b36080e5da3645690549990, 6cfc1b90cb86f4aabc69fb8e30128e07e2cdfa3a

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-c382-phc9-mxqc

What to do

Upgrade Linux kernel to 40507f59f230dcf60ae13cb48d34f8c6e9f40659, 9ac57e4c62e93c287b36080e5da3645690549990 or 6cfc1b90cb86f4aabc69fb8e30128e07e2cdfa3a.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ bbd0d59809f923ea2b540cbd781b32110e249f6e, < 40507f59f230dcf60ae13cb48d34f8c6e9f40659	Fixed in 40507f59f230dcf60ae13cb48d34f8c6e9f40659
LinuxLinux	Affected ≥ bbd0d59809f923ea2b540cbd781b32110e249f6e, < 9ac57e4c62e93c287b36080e5da3645690549990	Fixed in 9ac57e4c62e93c287b36080e5da3645690549990
LinuxLinux	Affected ≥ bbd0d59809f923ea2b540cbd781b32110e249f6e, < 6cfc1b90cb86f4aabc69fb8e30128e07e2cdfa3a	Fixed in 6cfc1b90cb86f4aabc69fb8e30128e07e2cdfa3a
LinuxLinux	Affected =2.6.24	Fixed in–

AI-suggested

A fix has been implemented that rejects SCTP chunks shorter than the four-byte generic header, preventing the malformed chunk processing and soft-lockup. Users should apply the official Linux kernel patch that includes this fix. No additional mitigation steps are indicated by the vendor advisory.

Description

A vulnerability in the Linux kernel SCTP implementation allows a remote SCTP peer to trigger a receive softirq lockup by sending zero-length SCTP chunks. This occurs because the inqueue parser accepts chunks shorter than the required four-byte generic header, leading to repeated processing of malformed chunks and potential kernel soft-lockup. The issue affects kernels built with CONFIG_IP_SCTP and specific SCTP configurations. A patch has been applied to reject chunks shorter than the generic header, preventing the lockup.

References

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