Linux Kernel DM-integrity Inline-mode Buffer Overflow Large Tag Size
CVE-2026-99098 Published on October 26, 2026
dm-integrity: fix buffer overflow in inline mode with large tag size
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.
Products Associated with CVE-2026-99098
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Affected Versions
Linux:- Version fb0987682c629c1d2c476f35f6fde405a5e304a4 and below 3c7aad85aeb9e28386672e3a009aa2e61f751b86 is affected.
- Version fb0987682c629c1d2c476f35f6fde405a5e304a4 and below 4f0ee735dc68e3e6c4dd9a666d7f7047163c4165 is affected.
- Version fb0987682c629c1d2c476f35f6fde405a5e304a4 and below f49cd7820cd0a96f20e1aa2708adb002124e38a7 is affected.
- Version fb0987682c629c1d2c476f35f6fde405a5e304a4 and below 764b683a6180fd72c931c13fea98d383506a3475 is affected.
- Version 6.11 is affected.
- Before 6.11 is unaffected.
- Version 6.12.114, <= 6.12.* is unaffected.
- Version 6.18.57, <= 6.18.* is unaffected.
- Version 7.2.11, <= 7.2.* is unaffected.
- Version 7.3, <= * is unaffected.