What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-03 · updated 2026-10-15
• Weakness: CWE-476

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.

Affected products

• Linux kernel: from 4.10.1 before 6.12.83; from 6.13 before 6.19.10; 4.10, 7.0-rc1, 7.0-rc2, 7.0-rc3, 7.0-rc4, 7.0-rc5 (+2) — fixed in 6.12.83, 6.19.10

How to fix

Upgrade to a fixed version: Linux kernel 6.12.83, 6.19.10. Check the vendor advisory for mitigations.

References

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

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