SB20260720400 - Missing Release of Resource after Effective Lifetime in Linux kernel ipv6

Description

This security bulletin contains information about 1 vulnerability.

1) Missing Release of Resource after Effective Lifetime (CVE-ID: CVE-2026-63872)

CWE-ID: CWE-772 - Missing Release of Resource after Effective Lifetime

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a reference leak in esp4.c and esp6.c ESP output handling when processing error paths after building scatterlists for non-inplace encryption. A local user can trigger skb_to_sgvec() failure to cause a denial of service.

The issue occurs in both IPv4 and IPv6 ESP code paths when old skb page fragments are replaced with a new page and the destination scatterlist construction fails before the request fields are initialized.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/2982e599fff6faa21c8df147d96fc7af6c1a2f24
• https://git.kernel.org/stable/c/e705b8ff4dd38fb8fe4e6fdc5378a86acea4feb5