SB20261022173 - Incomplete cleanup in Linux kernel ipv4

Description

This security bulletin contains information about 1 vulnerability.

1) Incomplete cleanup (CVE-ID: CVE-2026-98595)

CWE-ID: CWE-459 - Incomplete cleanup

CVSSv4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to cause an IPv6 UDP datagram to match a disconnected socket through stale peer-address state.

The vulnerability exists due to incomplete cleanup of the IPv6 peer address in the Linux kernel __udp_disconnect() function when disconnecting an IPv6 UDP socket. A remote attacker can send a datagram from the former peer with source port zero to match a disconnected socket whose stale entry remains in the 4-tuple hash table, potentially causing unintended packet delivery.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/9e95b1a94c9c49b4ba722251bbca2759b9c51737
• https://git.kernel.org/stable/c/c21daf37d5ce9a4e234b7c42238ac1e6041e28e4
• https://git.kernel.org/stable/c/d1b5fd969cc53f29d02b82b05a45135de4a6087a