net/smc: stop killed, freed and out_of_sync sharing a byte (CVE-2026-80980) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-80980

net/smc: stop killed, freed and out_of_sync sharing a byte

Answer in brief

CVE-2026-80980 records a Unknown severity vulnerability in net/smc: stop killed, freed and out_of_sync sharing a byte. 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	>=b286a0651e4404ab96cdfdcdad8a839a26b3751e <313f79149eb337411c64e2c247234b62ef9a3cb9 \|\| >=b286a0651e4404ab96cdfdcdad8a839a26b3751e <2cb7a8d64b7e8ccdc69bbe48fe9c4eaa79c33aec \|\| >=b286a0651e4404ab96cdfdcdad8a839a26b3751e <db51a8658c11a82432b64999519a269c3aabb447	313f79149eb337411c64e2c247234b62ef9a3cb9, 2cb7a8d64b7e8ccdc69bbe48fe9c4eaa79c33aec, db51a8658c11a82432b64999519a269c3aabb447
Linux/Linuxgeneric	5.8	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 313f79149eb337411c64e2c247234b62ef9a3cb9 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/smc: stop killed, freed and out_of_sync sharing a byte The three connection state flags are single-bit bitfields, so they occupy one byte of struct smc_connection and every store to one is a read-modify-write of the other two: u8 killed : 1; u8 freed : 1; u8 out_of_sync : 1; They are not written under a common lock. smc_cdc_msg_validate() sets out_of_sync from the receive tasklet, while smc_conn_kill() sets killed from process context under lock_sock(), and the receive path does not defer to the backlog when the socket is owned -- smc_cdc_msg_recv() takes only bh_lock_sock(). Give each flag its own byte so a store no longer touches its neighbours. All readers test them as booleans and are unchanged. struct smc_connection grows by two bytes.

Quoted source text, attributed separately from HOL analysis.