SB2026102374 - NULL pointer dereference in Linux kernel md driver

Description

This security bulletin contains information about 1 vulnerability.

1) NULL pointer dereference (CVE-ID: CVE-2026-99087)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: 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]

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.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/2e25842f0e4423e0efb243f56153d842ed6b933f
• https://git.kernel.org/stable/c/69ed43ed8a174465fca1ba6bfbde53e4618c8956
• https://git.kernel.org/stable/c/7d4d4f3b668d708d94f62ecdd33ac330a6fd8a84