SB2026082466 - Improper resource shutdown or release in Linux kernel netfilter

Description

This security bulletin contains information about 1 vulnerability.

1) Improper resource shutdown or release (CVE-ID: CVE-2026-74695)

CWE-ID: CWE-404 - Improper Resource Shutdown or Release

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 cause a denial of service.

The vulnerability exists due to improper resource management in netfilter nf_flow_table offload hooks and the XFRM offload path when processing incoming sk_buffs that already carry a ref-counted dst_entry. A local user can trigger packet handling that overwrites the existing destination reference to cause a denial of service.

The issue leaks a previous dst_entry reference count and triggers a DEBUG_NET_WARN_ON_ONCE assertion in skb_dst_check_unset().

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/12afa450a6a6c0cce2c42b7545a9958f62d8a00c
• https://git.kernel.org/stable/c/538e67e8c7889cf5f93951f5309d1bcb41f86036
• https://git.kernel.org/stable/c/8aecf0bbcc72605592134c917c222207d8f63ab0