Improper handling of exceptional conditions in Linux kernel - CVE-2026-98279

Vulnerability identifier: #VU153747

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-2026-98279

CWE-ID: CWE-755

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 handling of metadata reservation failures in the Btrfs verity rollback and orphan cleanup functions when cleaning up verity items after a failed verity enablement. A local user can trigger verity enablement that encounters a quota limit and subsequent rollback failure to cause a denial of service.

The triggering quota limit can be confined to a single subvolume.

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/4b7ecabd87dc40998fe7870d7975279649229a3b
• https://git.kernel.org/stable/c/76bf149cd0298544631e756670b89c399c7acbca
• https://git.kernel.org/stable/c/efa5780b84f066f419a667f6b9542368b2f62074

• Improper handling of exceptional conditions in Linux kernel btrfs
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more