NULL pointer dereference in Linux kernel - CVE-2026-99086
Published: October 23, 2026
Vulnerability identifier: #VU157415
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-2026-99086
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local privileged user to cause a denial of service.
The vulnerability exists due to insufficient validation of superblock geometry in dm_integrity_resume() when reloading the superblock after a device suspension. A local privileged user can increase log2_sectors_per_block on the underlying device while the dm-integrity device is suspended to make journal indexing exceed the allocated journal structures after resume, triggering a 512-byte write through lowmem_page_address(NULL) and causing a kernel crash.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-99086
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.117-1
linux (Debian package) - update to 6.12.117-1