dm-integrity: replace forgeable discard filler with a keyed sector marker (CVE-2026-90333) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-90333

dm-integrity: replace forgeable discard filler with a keyed sector marker

Answer in brief

CVE-2026-90333 records a Unknown severity vulnerability in dm-integrity: replace forgeable discard filler with a keyed sector marker. 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	>=84597a44a9d86ac949900441cea7da0af0f2f473 <5c58ea19a909ef6bed4f0f824e9cd7e30d7e4775 \|\| >=84597a44a9d86ac949900441cea7da0af0f2f473 <6228722c27304e4682cddc1fede03898f87e4414 \|\| >=84597a44a9d86ac949900441cea7da0af0f2f473 <68c5c42567bc462139128968ebbfadd0aefff519	5c58ea19a909ef6bed4f0f824e9cd7e30d7e4775, 6228722c27304e4682cddc1fede03898f87e4414, 68c5c42567bc462139128968ebbfadd0aefff519
Linux/Linuxgeneric	5.7	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 5c58ea19a909ef6bed4f0f824e9cd7e30d7e4775 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: replace forgeable discard filler with a keyed sector marker The discard-block check in dm_integrity_rw_tag() treats a stored tag of all 0xf6 bytes (DISCARD_FILLER) as proof a block was discarded and skips HMAC verification. allow_discards is only accepted in dm-integrity's standalone mode. An attacker with raw write access to the backing device, but without the integrity key, can stamp any block with an all-0xf6 tag and have it served as authentic. Add a new "allow_discards_keyed" target argument that marks discarded blocks with a keyed checksum of (salt || sector) instead, computed by integrity_discard_checksum().

Quoted source text, attributed separately from HOL analysis.