Medium 5.5Published Apr 3, 2026

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

Updated under an hour ago (Oct 27, 2026, 8:10 PM ET)

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Exploited in the last 30 days

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.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 1ababeba4a21f3dba3da3523c670b207fb2feb62 before 0348fa0ada37cef7c6b5ab2a428bb2c6aee784e4; from 1ababeba4a21f3dba3da3523c670b207fb2feb62 before 83d705d35e583cb1b1eacf196dfe7b77d442018e; from 1ababeba4a21f3dba3da3523c670b207fb2feb62 before d1bd8b9edc6752d10f84d28ff64f842401ce336d; from 1ababeba4a21f3dba3da3523c670b207fb2feb62 before 50352fc103928e10e8729abc79a0d05abef26c4d; from 1ababeba4a21f3dba3da3523c670b207fb2feb62 before bc9843c39f9932a8b36efd1d362ea00bb88e4e78; from 1ababeba4a21f3dba3da3523c670b207fb2feb62 before c5cedee5d97382176573bbe21e1724e737a5eb64; from 1ababeba4a21f3dba3da3523c670b207fb2feb62 before a25853c9feea7bbf31d157ff6e004d2d3b4f7f13; from 1ababeba4a21f3dba3da3523c670b207fb2feb62 before 06413793526251870e20402c39930804f14d59c0	CNA record
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	all versions	CISA ADP
linux linux_kernel linux:linux_kernel	from 4.10.1 before 6.12.83; from 6.13 before 6.19.10; 4.10; 7.0; 7.0; 7.0; 7.0; 7.0; and 2 more ranges	NVD

References

References

https://git.kernel.org/stable/c/0348fa0ada37cef7c6b5ab2a428bb2c6aee784e4
https://git.kernel.org/stable/c/83d705d35e583cb1b1eacf196dfe7b77d442018e
https://git.kernel.org/stable/c/d1bd8b9edc6752d10f84d28ff64f842401ce336d
https://git.kernel.org/stable/c/50352fc103928e10e8729abc79a0d05abef26c4d
https://git.kernel.org/stable/c/bc9843c39f9932a8b36efd1d362ea00bb88e4e78	patch
https://git.kernel.org/stable/c/c5cedee5d97382176573bbe21e1724e737a5eb64
https://git.kernel.org/stable/c/a25853c9feea7bbf31d157ff6e004d2d3b4f7f13	patch
https://git.kernel.org/stable/c/06413793526251870e20402c39930804f14d59c0	patch
https://cert-portal.siemens.com/productcert/html/ssa-784472.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.