Improper control of a resource through its lifetime in Linux kernel - CVE-2026-90042
Published: September 16, 2026
Vulnerability identifier: #VU150244
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-90042
CWE-ID: CWE-664
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper handling of non-linear memory buffers in ceph_fname_to_usr() when processing MDS messages held in vmalloc()-allocated buffers. A remote attacker can cause a message containing encrypted filenames to be processed to cause a denial of service.
The issue can result in kernel oopses, especially on non-x86 platforms.
Affected software
Linux kernel
How to mitigate CVE-2026-90042
Install security update from vendor's repository.