net: thunderbolt: Release the Rx HopID that was handed out on mismatch (CVE-2026-80990) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-80990

net: thunderbolt: Release the Rx HopID that was handed out on mismatch

Answer in brief

CVE-2026-80990 records a Unknown severity vulnerability in net: thunderbolt: Release the Rx HopID that was handed out on mismatch. 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 11, 2026Updated Sep 11, 2026Source checked Sep 11, 2026First seen by HOL Sep 11, 2026Material review Sep 11, 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	>=180b0689425c6fb2b35e69a3316ee38371a782df <9eac1817bfc5fa76e3a2d1b8fd824cc6ef5a9ab0 \|\| >=180b0689425c6fb2b35e69a3316ee38371a782df <61ff3c353e5d2ff4eb9d0b6d8d9e47805b136eea \|\| >=180b0689425c6fb2b35e69a3316ee38371a782df <1c361f6cf39be7cc0ce37c0b67bd1cdf74b0a0c1 \|\| >=180b0689425c6fb2b35e69a3316ee38371a782df <2f1463554d0561a2fead81e3888604e5c1125e29	9eac1817bfc5fa76e3a2d1b8fd824cc6ef5a9ab0, 61ff3c353e5d2ff4eb9d0b6d8d9e47805b136eea, 1c361f6cf39be7cc0ce37c0b67bd1cdf74b0a0c1, 2f1463554d0561a2fead81e3888604e5c1125e29
Linux/Linuxgeneric	5.13	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 9eac1817bfc5fa76e3a2d1b8fd824cc6ef5a9ab0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 11, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: net: thunderbolt: Release the Rx HopID that was handed out on mismatch tb_xdomain_alloc_in_hopid() passes the wanted HopID to ida_alloc_range() as the lower bound, so a taken id is not an error there: the allocator returns the next free one above it. tbnet_connected_work() asks for the peer's transmit path, treats any other id as a failure and returns without releasing what it got, so that allocation stays live for the rest of the XDomain connection with nothing left holding a reference to it. Release the id when it is not the one we asked for, the same way the error unwind at the end of the function releases the expected one.

Quoted source text, attributed separately from HOL analysis.