Use-after-free in Linux kernel - CVE-2026-98443

Vulnerability identifier: #VU156741

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-2026-98443

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to potentially cause a denial of service through kernel memory corruption.

The vulnerability exists due to use-after-free in the XFS xlog_recover_iunlink_bucket function when recovering unlinked inode buckets and an inode garbage-collection flush fails. A local user can potentially trigger this recovery error path to cause access to a released inode and a kernel crash.

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/47a948ba653a463d429e02fda2f06a3d6b78666d
• https://git.kernel.org/stable/c/65f39d09d73718611cee40399179323b5d4ead00
• https://git.kernel.org/stable/c/66a2179d02668f8df44b1a249899006f3ba38ea0
• https://git.kernel.org/stable/c/8c9d5b8a96d6b93eb24e07b4163c89341ba29bd1
• https://git.kernel.org/stable/c/961c717e6bf0e53c2c2b1fe4aef1add9390fedab

• Use-after-free in Linux kernel xfs
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more