dm-integrity: fix buffer overflow with keyed discard (CVE-2026-90052) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-90052

dm-integrity: fix buffer overflow with keyed discard

Answer in brief

CVE-2026-90052 records a Unknown severity vulnerability in dm-integrity: fix buffer overflow with keyed discard. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 17, 2026Updated Sep 17, 2026Source checked Sep 17, 2026First seen by HOL Sep 17, 2026Material review Sep 17, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=5c58ea19a909ef6bed4f0f824e9cd7e30d7e4775 <9988c1c9e0d1c78391e3d8e2817beb667470c76f \|\| >=6228722c27304e4682cddc1fede03898f87e4414 <dd08a645195f410f2dcaa40de379a45ce110e873 \|\| >=68c5c42567bc462139128968ebbfadd0aefff519 <59e6f919d77d72ec79cbf171256f2f7819737580	9988c1c9e0d1c78391e3d8e2817beb667470c76f, dd08a645195f410f2dcaa40de379a45ce110e873, 59e6f919d77d72ec79cbf171256f2f7819737580
Linux/Linuxgeneric	7.3-rc1	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 9988c1c9e0d1c78391e3d8e2817beb667470c76f if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 17, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.