VulnerabilityPublished 18 Oct 2026

CVE-2026-98531: Linux kernel · ipv6: sr: enforce exact attribute length for SEG6_ATTR_DST

Source GCVE Database

Authoritative record:CVE-2026-98531· Medium

Not known to be exploited · fixed in e3ac68c1cdc2535d127b2bfd50c263d16c8e4199 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 14:05 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 12% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in e3ac68c1cdc2535d127b2bfd50c263d16c8e4199, 195813bb7324c338eaba0aaa02b18681ee65b670, 94214cf0a08dd2c5f37aeeea46078d9dfe8e4a0e +5

Exploitation evidence

Disclosed: evidence found.
CVE published 18 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-365h-h8v6-r47m

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 915d7e5e5930b4f01d0971d93b9b25ed17d221aa, < e3ac68c1cdc2535d127b2bfd50c263d16c8e4199	Fixed in e3ac68c1cdc2535d127b2bfd50c263d16c8e4199
LinuxLinux	Affected ≥ 915d7e5e5930b4f01d0971d93b9b25ed17d221aa, < 195813bb7324c338eaba0aaa02b18681ee65b670	Fixed in 195813bb7324c338eaba0aaa02b18681ee65b670
LinuxLinux	Affected ≥ 915d7e5e5930b4f01d0971d93b9b25ed17d221aa, < 94214cf0a08dd2c5f37aeeea46078d9dfe8e4a0e	Fixed in 94214cf0a08dd2c5f37aeeea46078d9dfe8e4a0e
LinuxLinux	Affected ≥ 915d7e5e5930b4f01d0971d93b9b25ed17d221aa, < 209eefebee54c4a5f01d68b61e8ac9881eca2de9	Fixed in 209eefebee54c4a5f01d68b61e8ac9881eca2de9
LinuxLinux	Affected ≥ 915d7e5e5930b4f01d0971d93b9b25ed17d221aa, < 66bf65fa109326e4c4ddeb0b94093379f72838fd	Fixed in 66bf65fa109326e4c4ddeb0b94093379f72838fd
LinuxLinux	Affected ≥ 915d7e5e5930b4f01d0971d93b9b25ed17d221aa, < 050a0aa3c80907b8c60a396b7e04d48d8b1a9e70	Fixed in 050a0aa3c80907b8c60a396b7e04d48d8b1a9e70

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A patch is available that enforces exact length validation on the SEG6_ATTR_DST attribute, rejecting malformed netlink messages and preventing the memory leak. Users should update to a Linux kernel version that includes this fix. No additional mitigations are indicated.

Description

A vulnerability in the Linux kernel's IPv6 segment routing (SR) implementation allowed an out-of-bounds read of uninitialized kernel memory due to improper length validation of the SEG6_ATTR_DST attribute. This flaw could leak kernel heap memory to userspace. The issue was fixed by enforcing exact attribute length validation, preventing malformed netlink messages from triggering the memory leak.

References

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