Missing Release of Resource after Effective Lifetime in Linux kernel - CVE-2026-98558

Vulnerability identifier: #VU156862

CSH Severity: Low

CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-98558

CWE-ID: CWE-772

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause a denial of service by indefinitely stalling network device or driver teardown.

The vulnerability exists due to failure to release deferred socket buffers in the Linux kernel networking subsystem when a CPU goes offline with pending buffers in net_hotdata.skb_defer_nodes. A local user can exploit this condition when stranded buffers hold page_pool fragments to cause page_pool_destroy() to wait indefinitely during network device or driver teardown while the CPU remains offline.

Linux kernel
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)

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

• https://git.kernel.org/stable/c/06e3f54e8b22040ada01a28343badf1990b4dd7d
• https://git.kernel.org/stable/c/c68f4157463448a76893223e117170be8374d773

• Missing Release of Resource after Effective Lifetime in Linux kernel core
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more