SB20260325131 - Missing Release of Resource after Effective Lifetime in Linux kernel xdp

Description

This security bulletin contains information about 1 security vulnerability.

1) Missing Release of Resource after Effective Lifetime (CVE-ID: CVE-2026-23326)

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

The vulnerability exists due to improper list management in the XSK (AF_XDP) subsystem when handling buffer fragments. A local user can trigger improper deletion of fragment nodes, leading to a buffer leak that results in resource exhaustion over time.

The issue arises because list_node is reused for both the xskb pool list and the buffer free list, and list_del() does not reinitialize node pointers, causing xp_free() to incorrectly skip returning buffers to the free list.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/2a9ea988465ece5b6896b1bdc144170a64e84c35
• https://git.kernel.org/stable/c/5172adf9efb8298a52f4dcdc3f98d4d9d1e06a6d
• https://git.kernel.org/stable/c/60abb0ac11dccd6b98fd9182bc5f85b621688861
• https://git.kernel.org/stable/c/645c6d8376ad4913cbffe0e0c2cca0c4febbe596
• https://git.kernel.org/stable/c/b38cbd4af5034635cff109e08788c63f956f3a69