Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: dm-integrity: fix buffer overflow with keyed discard Since commit 68c5c42567bc ("dm-integrity: replace forgeable discard filler with a keyed sector marker"), integrity_metadata computes a checksum for every discarded block into the "checksums" buffer. integrity_sector_checksum always writes the whole digest. So if the tag size is smaller than the digest size, the checksum of the last block that fits into the buffer is written past the end of it. For example, with hmac(sha256) and tag size 16, a 4MiB discard writes 16 bytes past the kmalloc'ed page. Fix this by subtracting extra_space from the buffer size when computing max_blocks, like we do for writes.
CVSS Score
HIGH
References
- https://git.kernel.org/stable/c/59e6f919d77d72ec79cbf171256f2f7819737580
- https://git.kernel.org/stable/c/9988c1c9e0d1c78391e3d8e2817beb667470c76f
- https://git.kernel.org/stable/c/dd08a645195f410f2dcaa40de379a45ce110e873
FAQ
What is CVE-2026-90052?
CVE-2026-90052 is a vulnerability with a CVSS score of 7.8 (HIGH). In the Linux kernel, the following vulnerability has been resolved: dm-integrity: fix buffer overflow with keyed discard Since commit 68c5c42567bc ("dm-integrity: replace forgeable discard filler wi...
How severe is CVE-2026-90052?
CVE-2026-90052 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-90052?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.