dm-integrity: fix buffer overflow with keyed discard

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-90052
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:16:53 UTC
Updated2026-09-18 18:17:39 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001750000 probability, percentile 0.072480000 (date 2026-09-20)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 5c58ea19a909ef6bed4f0f824e9cd7e30d7e4775 9988c1c9e0d1c78391e3d8e2817beb667470c76f git Not specified
CNA Linux Linux affected 6228722c27304e4682cddc1fede03898f87e4414 dd08a645195f410f2dcaa40de379a45ce110e873 git Not specified
CNA Linux Linux affected 68c5c42567bc462139128968ebbfadd0aefff519 59e6f919d77d72ec79cbf171256f2f7819737580 git Not specified
CNA Linux Linux affected 7.3-rc1 Not specified
CNA Linux Linux unaffected 7.3-rc1 semver Not specified
CNA Linux Linux unaffected 7.3-rc2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/9988c1c9e0d1c78391e3d8e2817beb667470c76f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/dd08a645195f410f2dcaa40de379a45ce110e873 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/59e6f919d77d72ec79cbf171256f2f7819737580 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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