CVE-2026-99098 dm-integrity: fix buffer overflow in inline mode with large tag size
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-99098?
CVE-2026-99098 is a vulnerability in Linux, published on 26 Oct 2026.
Official description
In the Linux kernel, the following vulnerability has been resolved:
dm-integrity: fix buffer overflow in inline mode with large tag size
In inline mode, dm_integrity_check and dm_integrity_inline_recheck compute the checksum of each block into an on-stack buffer of HASH_MAX_DIGESTSIZE bytes. integrity_sector_checksum pads its result with zeroes up to the tag size, so if the tag size is larger than HASH_MAX_DIGESTSIZE, the padding runs past the end of the buffer. With CONFIG_STACKPROTECTOR the kernel panics in dm_integrity_check on the first read.
Enlarge both buffers to hold MAX_TAG_SIZE bytes, as commit b93b6643e9b5 ("dm integrity: fix a crash with unusually large tag size") did for integrity_metadata.
Note that this is not a security bug because the buffer overflow can only be triggered by root.
Which versions are affected by CVE-2026-99098?
How do I fix CVE-2026-99098?
Upgrade to a fixed version.
Is CVE-2026-99098 being exploited?
There is no known exploitation of CVE-2026-99098 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-99098, DEBIAN-CVE-2026-99098, GHSA-wfqx-5v3g-mpcg, UBUNTU-CVE-2026-99098.