Improper Check or Handling of Exceptional Conditions in Linux kernel - CVE-2026-43188
Published: May 7, 2026
Vulnerability identifier: #VU130548
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-43188
CWE-ID: CWE-703
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper error handling in ceph_process_folio_batch() when processing encrypted folios during writeback with fscrypt enabled. A local user can trigger bounce buffer allocation failures so that the error is propagated to the main writeback loop to cause a denial of service.
The issue is exposed when fscrypt is enabled, and the failure can lead to a kernel oops in the worker through a BUG_ON() condition on a subsequent iteration.
How to mitigate CVE-2026-43188
Install security update from vendor's repository.