Unknown severity · Source severity not reportedCVE-2026-98587

firewire: cdev: fix back-transition for iso_resource_auto client resourceCVE-2026-98587

Answer in brief

CVE-2026-98587 records a Unknown severity vulnerability in firewire: cdev: fix back-transition for iso_resource_auto client resource. 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 Oct 18, 2026Updated Oct 19, 2026Source checked Oct 25, 2026First seen by HOL Oct 18, 2026Material review Oct 19, 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	>=fcabbf40fae501379b4f3a057febe92d4b0ebdd8 <ee1df60a0d0e8ab4b00137135733bdadd6d33dab \|\| >=fcabbf40fae501379b4f3a057febe92d4b0ebdd8 <c6b51091cafff9ce6c03c1416aa13864d17ab97c	ee1df60a0d0e8ab4b00137135733bdadd6d33dab, c6b51091cafff9ce6c03c1416aa13864d17ab97c
Linux/Linuxgeneric	7.2	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to ee1df60a0d0e8ab4b00137135733bdadd6d33dab if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Oct 18, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 18, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: firewire: cdev: fix back-transition for iso_resource_auto client resource The todo member of iso_resource_auto structure represents the state of the client resource and normally transitions in the following order: ISO_RES_AUTO_ALLOC -> ISO_RES_AUTO_REALLOC -> ISO_RES_AUTO_DEALLOC However, concurrent access from the work item and the file descriptor release function can cause the state to transition backwards from ISO_RES_AUTO_DEALLOC to ISO_RES_AUTO_REALLOC. Prevent the back-transition by checking the current state before updating it in the work item.

Quoted source text, attributed separately from HOL analysis.