Operation on a Resource after Expiration or Release in Linux kernel - CVE-2026-74559

Vulnerability identifier: #VU143218

CSH Severity: Low

CVSS v4: 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]

CVE-ID: CVE-2026-74559

CWE-ID: CWE-672

Exploitation vector: Local access

Exploit availability: No public exploit available

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

The vulnerability exists due to improper state management in xsk_build_skb() and the generic AF_XDP transmit path when processing fragmented packet descriptors after an overflow or invalid descriptor condition. A local user can submit crafted multi-buffer descriptors to cause a denial of service.

The issue occurs when the count of descriptors exceeds MAX_SKB_FRAGS or an invalid descriptor is included in a fragmented packet.

Linux kernel
Debian Linux
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux (Debian package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17
linux (Debian package) - update to 6.12.115-2

• https://git.kernel.org/stable/c/5e94d74e4f3baebaa083288f33b4be7ce0a34982
• https://git.kernel.org/stable/c/bd44a6dcd4248883de90f5dad53ae80066e27096
• https://git.kernel.org/stable/c/ceb00cb87a22c42d20c39336213db2b843ca9e34

• Operation on a Resource after Expiration or Release in Linux kernel xdp
• Debian update for linux
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more