VulnerabilityPublished 3 Apr 2026Updated 5 Nov 2026

CVE-2026-23442: Linux kernel · ipv6: add NULL checks for idev in SRv6 paths

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in d1bd8b9edc6752d10f84d28ff64f842401ce336d : update Linux kernel when convenient.

Data as of 5 Nov 2026, 21:49 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, 2026-11-05.

Patch

Available – fixed in d1bd8b9edc6752d10f84d28ff64f842401ce336d, c5cedee5d97382176573bbe21e1724e737a5eb64, bc9843c39f9932a8b36efd1d362ea00bb88e4e78 +5

Exploitation evidence

Disclosed: evidence found.
CVE published 3 Apr 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 5 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 ≥ 1ababeba4a21f3dba3da3523c670b207fb2feb62, < d1bd8b9edc6752d10f84d28ff64f842401ce336d	Fixed in d1bd8b9edc6752d10f84d28ff64f842401ce336d
LinuxLinux	Affected ≥ 1ababeba4a21f3dba3da3523c670b207fb2feb62, < c5cedee5d97382176573bbe21e1724e737a5eb64	Fixed in c5cedee5d97382176573bbe21e1724e737a5eb64
LinuxLinux	Affected ≥ 1ababeba4a21f3dba3da3523c670b207fb2feb62, < bc9843c39f9932a8b36efd1d362ea00bb88e4e78	Fixed in bc9843c39f9932a8b36efd1d362ea00bb88e4e78
LinuxLinux	Affected ≥ 1ababeba4a21f3dba3da3523c670b207fb2feb62, < a25853c9feea7bbf31d157ff6e004d2d3b4f7f13	Fixed in a25853c9feea7bbf31d157ff6e004d2d3b4f7f13
LinuxLinux	Affected ≥ 1ababeba4a21f3dba3da3523c670b207fb2feb62, < 06413793526251870e20402c39930804f14d59c0	Fixed in 06413793526251870e20402c39930804f14d59c0
LinuxLinux	Affected ≥ 1ababeba4a21f3dba3da3523c670b207fb2feb62, < 50352fc103928e10e8729abc79a0d05abef26c4d	Fixed in 50352fc103928e10e8729abc79a0d05abef26c4d

Description

In the Linux kernel, the following vulnerability has been resolved: ipv6: add NULL checks for idev in SRv6 paths __in6_dev_get() can return NULL when the device has no IPv6 configuration (e.g. MTU < IPV6_MIN_MTU or after NETDEV_UNREGISTER). Add NULL checks for idev returned by __in6_dev_get() in both seg6_hmac_validate_skb() and ipv6_srh_rcv() to prevent potential NULL pointer dereferences.

References

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