Resource exhaustion in Linux kernel - CVE-2026-93243
Published: September 25, 2026
Vulnerability identifier: #VU152153
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-2026-93243
CWE-ID: CWE-400
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper locked-page resource accounting in the Linux kernel secretmem feature when mapping and unmapping secret memory ranges. A local user can repeatedly map and unmap secret memory ranges to consume all available system memory with unevictable folios and cause a denial of service.
A secretmem file descriptor can be passed between processes and inherited across fork.
Affected software
Linux kernel
How to mitigate CVE-2026-93243
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3