SB20261022172 - 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: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

The vulnerability allows a local user to degrade UDP packet-processing performance.

The vulnerability exists due to incomplete cleanup of disconnected sockets in the Linux kernel UDP 4-tuple hash table when disconnecting a socket bound to a specific address and port. A local user can create, connect, and disconnect such sockets while keeping them open to retain stale hash entries and force an unnecessary 4-tuple lookup for every packet targeting the corresponding local address and port.

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