CVE-2022-49044: dm integrity: fix memory corruption when tag_size is less than digest size

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-02-26 · updated 2026-08-13
Weakness: CWE-787

Description

In the Linux kernel, the following vulnerability has been resolved: dm integrity: fix memory corruption when tag_size is less than digest size It is possible to set up dm-integrity in such a way that the "tag_size" parameter is less than the actual digest size. In this situation, a part of the digest beyond tag_size is ignored. In this case, dm-integrity would write beyond the end of the ic->recalc_tags array and corrupt memory. The corruption happened in integrity_recalc->integrity_sector_checksum->crypto_shash_final. Fix this corruption by increasing the tags array so that it has enough padding at the end to accomodate the loop in integrity_recalc() being able to write a full digest size for the last member of the tags array.

Affected products

Linux kernel: from 4.12 before 4.19.240; from 4.20 before 5.4.190; from 5.5 before 5.10.112; from 5.11 before 5.15.35; from 5.16 before 5.17.4; 5.18-rc1, 5.18-rc2 — fixed in 4.19.240, 5.10.112, 5.15.35, 5.17.4, 5.4.190

How to fix

Upgrade to a fixed version: Linux kernel 4.19.240, 5.10.112, 5.15.35, 5.17.4. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2022-49044 or the next vulnerability affects your stack