VulnerabilityPublished 27 May 2026Updated 6 Nov 2026

CVE-2026-45850: Linux kernel · ipvs: skip ipv6 extension headers for csum checks

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in d643c1ec80b70508f54dac12179e36920e2c00de : update Linux kernel when convenient.

Data as of 6 Nov 2026, 16:04 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch

Available – fixed in d643c1ec80b70508f54dac12179e36920e2c00de, cdce1e797addab72393c0dfee31aaca41ef7d937, a3ca27762ce8476b4fbf9b2a8f5cb74c38e483e4 +5

Exploitation evidence

Disclosed: evidence found.
CVE published 27 May 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 6 Nov 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.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 0bbdd42b7efa66685b6d74701bcde3a596a3a59d, < d643c1ec80b70508f54dac12179e36920e2c00de	Fixed in d643c1ec80b70508f54dac12179e36920e2c00de
LinuxLinux	Affected ≥ 0bbdd42b7efa66685b6d74701bcde3a596a3a59d, < cdce1e797addab72393c0dfee31aaca41ef7d937	Fixed in cdce1e797addab72393c0dfee31aaca41ef7d937
LinuxLinux	Affected ≥ 0bbdd42b7efa66685b6d74701bcde3a596a3a59d, < a3ca27762ce8476b4fbf9b2a8f5cb74c38e483e4	Fixed in a3ca27762ce8476b4fbf9b2a8f5cb74c38e483e4
LinuxLinux	Affected ≥ 0bbdd42b7efa66685b6d74701bcde3a596a3a59d, < 768f665f3685b455ed686370ed7ccb852a125a3b	Fixed in 768f665f3685b455ed686370ed7ccb852a125a3b
LinuxLinux	Affected ≥ 0bbdd42b7efa66685b6d74701bcde3a596a3a59d, < 54add3b7d3c154ca89ef5bac2582b0ed1a3a15d5	Fixed in 54add3b7d3c154ca89ef5bac2582b0ed1a3a15d5
LinuxLinux	Affected ≥ 0bbdd42b7efa66685b6d74701bcde3a596a3a59d, < 9aa7edc1347b98774e5167ca34e5b8aa6083bde7	Fixed in 9aa7edc1347b98774e5167ca34e5b8aa6083bde7

Description

In the Linux kernel, the following vulnerability has been resolved: ipvs: skip ipv6 extension headers for csum checks Protocol checksum validation fails for IPv6 if there are extension headers before the protocol header. iph->len already contains its offset, so use it to fix the problem.

References

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