misc: fastrpc: take fl->lock when moving mmaps on interrupted invoke (CVE-2026-74646) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-74646

misc: fastrpc: take fl->lock when moving mmaps on interrupted invoke

Answer in brief

CVE-2026-74646 records a Unknown severity vulnerability in misc: fastrpc: take fl->lock when moving mmaps on interrupted invoke. 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 Aug 22, 2026Updated Aug 22, 2026Source checked Aug 22, 2026First seen by HOL Aug 22, 2026Material review Aug 22, 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	>=76e8e4ace1ed2c97dba3b1370e0e105e07c572bc <3f265e405e5ef85030c3777262e18bb556bc8724 \|\| >=76e8e4ace1ed2c97dba3b1370e0e105e07c572bc <a902fe1f80f58a2335b6be1131866f827ec44d1a \|\| >=76e8e4ace1ed2c97dba3b1370e0e105e07c572bc <af6345159abcbaa550518f31990d2a9558c2d369 \|\| >=76e8e4ace1ed2c97dba3b1370e0e105e07c572bc <efd02f8d1a7449f15809bc18d3cd41aafea75d7e \|\| >=76e8e4ace1ed2c97dba3b1370e0e105e07c572bc <b85a0e91d7d6cd06a53c881a46f749cfcef416a2	3f265e405e5ef85030c3777262e18bb556bc8724, a902fe1f80f58a2335b6be1131866f827ec44d1a, af6345159abcbaa550518f31990d2a9558c2d369, efd02f8d1a7449f15809bc18d3cd41aafea75d7e, b85a0e91d7d6cd06a53c881a46f749cfcef416a2
Linux/Linuxgeneric	6.2	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 3f265e405e5ef85030c3777262e18bb556bc8724 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 22, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: misc: fastrpc: take fl->lock when moving mmaps on interrupted invoke When an invoke is interrupted by a signal, wait_for_completion_interruptible() returns -ERESTARTSYS and fastrpc_internal_invoke() moves every buffer from fl->mmaps onto cctx->invoke_interrupted_mmaps. This list_del()/list_add_tail() walk runs without holding fl->lock, the lock that serialises fl->mmaps in fastrpc_req_mmap() and fastrpc_req_munmap() everywhere else. Take fl->lock around the move, matching every other fl->mmaps accessor.

Quoted source text, attributed separately from HOL analysis.