SB20260928264 - Use-after-free in Linux kernel ipv6

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-97940)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service, disclose sensitive information, or modify information.

The vulnerability exists due to a use-after-free in the IPv6 FIB route iterator walker handling when stopping an IPv6 route iterator while routes are deleted. A local user can trigger a race that leaves a freed walker on the IPv6 FIB walker list to cause a denial of service, disclose sensitive information, or modify information.

The same stop helper is used by /proc/net/ipv6_route and the BPF IPv6 route iterator.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0eede1689610e9eeaf729ba86fd1321799eb91a0
• https://git.kernel.org/stable/c/19b4ed644d68098cc62ab612727f40d30f43476c
• https://git.kernel.org/stable/c/4553cfafa8d05c4ce20b1d18f79d9bb3b303fc02
• https://git.kernel.org/stable/c/b89b691dd00bf39b9ba39ab9446f8c62f419fa7b