NULL pointer dereference in Linux kernel - CVE-2026-99087
Published: October 23, 2026
Vulnerability identifier: #VU157416
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-2026-99087
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 by crashing the kernel.
The vulnerability exists due to a null pointer dereference in the Linux kernel's dm_integrity_resume function when activating a dm-integrity device in 'R' mode with the SB_FLAG_DIRTY_BITMAP flag set. A local privileged user can activate a device under these conditions to trigger an attempt to read the journal containing the bitmap and cause a kernel crash.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-99087
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