Unchecked Return Value in Linux kernel - CVE-2026-98880

Vulnerability identifier: #VU157630

CSH Severity: Low

CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-98880

CWE-ID: CWE-252

Exploitation vector: Local access

Exploit availability: No public exploit available

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

The vulnerability exists due to unchecked return values from sb_set_blocksize in the ntfs3 ntfs_init_from_boot function when mounting an NTFS filesystem. A local privileged user can trigger mounting with a block size greater than PAGE_SIZE to cause a kernel assertion failure in folio_set_bh during the first __bread_gfp call, resulting in a denial of service.

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/24f7d1824b7581ae3daf9d443c5dfeabd89df6d8
• https://git.kernel.org/stable/c/78e10082f3e919b8863958feac5f269d3ade9469
• https://git.kernel.org/stable/c/c5b8a7ec9a0a71518915c82b8552be1ccbb88288
• https://git.kernel.org/stable/c/df9dac4dbe557f6455a61e68cc09ef98b22f3686

• Unchecked Return Value in Linux kernel ntfs3
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more