CVE-2026-99087 dm-integrity: fix NULL pointer dereference when the 'R' flag is used
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-99087?
CVE-2026-99087 is a vulnerability in Linux, published on 23 Oct 2026.
Official description
In the Linux kernel, the following vulnerability has been resolved:
dm-integrity: fix NULL pointer dereference when the 'R' flag is used
If the dm-integrity device has the SB_FLAG_DIRTY_BITMAP flag set and the user activates the device in the 'R' mode, a crash in dm_integrity_resume happens because the function attempts to read the journal containing the bitmap.
This patch makes dm-integrity skip any writes to the device in dm_integrity_resume if the device is activated in the 'R' mode.
Which versions are affected by CVE-2026-99087?
How do I fix CVE-2026-99087?
Upgrade to a fixed version.
Is CVE-2026-99087 being exploited?
There is no known exploitation of CVE-2026-99087 in the wild and no public exploit code.
Sources
Also known as AZL-110993, BELL-CVE-2026-99087, DEBIAN-CVE-2026-99087, GHSA-458p-v4rq-r32g, UBUNTU-CVE-2026-99087.