Improper handling of exceptional conditions in Linux kernel - CVE-2026-98445

Vulnerability identifier: #VU156743

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-2026-98445

CWE-ID: CWE-755

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to potentially cause a denial of service through leaked filesystem blocks or filesystem shutdown.

The vulnerability exists due to improper handling of memory allocation failures in the XFS xrep_newbt_add_blocks function when allocating a reservation object during online filesystem repair. A local user can potentially trigger an allocation failure to leave blocks allocated for a new btree unreleased or cause the filesystem to shut down because the callers cannot both undo the transaction and return an error.

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/0e0d3372a84029da1768c7a4c4601484af5b58a2
• https://git.kernel.org/stable/c/3380151cf0ce8ad0c1d356fed51e4b69e1d28e50
• https://git.kernel.org/stable/c/ab1c416d2377cdc16123ef521aac4da1c468c3d4
• https://git.kernel.org/stable/c/b15c79fca28060fd9c7e77f2c3ebc4ba023974e8

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