EUVD-2026-18684
GHSA-prgg-rgfw-vr94
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3Description
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.
Analysis
NULL pointer dereference in Linux kernel IPv6 SRv6 path processing allows local denial of service when __in6_dev_get() returns NULL due to missing IPv6 configuration or device unregistration. The vulnerability affects seg6_hmac_validate_skb() and ipv6_srh_rcv() functions which lacked NULL checks on the returned idev pointer, enabling a local attacker to crash the kernel by triggering these code paths on misconfigured or unregistering network devices.
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