VulnerabilityPublished 11 Sep 2026Updated 21 Oct 2026

CVE-2026-80996: Linux kernel · net: l2tp: do not propagate multicast notification errors

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in af20e269f7459d2ce69887fdf2fad7caf986c865 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:07 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in af20e269f7459d2ce69887fdf2fad7caf986c865, 50c4038f1670bf9a80c6a58ae83d1602decd8481, 9c340473f4822bb31b151c19afd17448eda5acd1 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 11 Sep 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.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 33f72e6f0c67f673fd0c63a8182dbd9ffb8cf50b, < af20e269f7459d2ce69887fdf2fad7caf986c865	Fixed in af20e269f7459d2ce69887fdf2fad7caf986c865
LinuxLinux	Affected ≥ 33f72e6f0c67f673fd0c63a8182dbd9ffb8cf50b, < 50c4038f1670bf9a80c6a58ae83d1602decd8481	Fixed in 50c4038f1670bf9a80c6a58ae83d1602decd8481
LinuxLinux	Affected ≥ 33f72e6f0c67f673fd0c63a8182dbd9ffb8cf50b, < 9c340473f4822bb31b151c19afd17448eda5acd1	Fixed in 9c340473f4822bb31b151c19afd17448eda5acd1
LinuxLinux	Affected ≥ 33f72e6f0c67f673fd0c63a8182dbd9ffb8cf50b, < 7efe1c31e0903a5aa796feb96d3adab574b7ff41	Fixed in 7efe1c31e0903a5aa796feb96d3adab574b7ff41
LinuxLinux	Affected ≥ 33f72e6f0c67f673fd0c63a8182dbd9ffb8cf50b, < 0fe037d5eaad938aa3e9143ee071aa237750b42b	Fixed in 0fe037d5eaad938aa3e9143ee071aa237750b42b
LinuxLinux	Affected =4.0	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: net: l2tp: do not propagate multicast notification errors The tunnel create, tunnel modify, session create, and session modify netlink handlers send multicast notifications through helpers that can fail while allocating or encoding a message, or while multicasting it. For tunnel and session create/modify, a notification is sent after the live operation has completed. Returning a best-effort notification error as the command result can therefore report failure for an operation that already committed and can cause callers to retry and accumulate live objects. Keep sending notifications for listener visibility, but do not propagate their best-effort status as the command result. This also keeps the tunnel modify command consistent with the other notification-only paths.

References

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