net/mlx5: E-Switch: fix use-after-free in mlx5_eswitch_termtbl_put (CVE-2026-98015) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-98015

net/mlx5: E-Switch: fix use-after-free in mlx5_eswitch_termtbl_put

Answer in brief

CVE-2026-98015 records a Unknown severity vulnerability in net/mlx5: E-Switch: fix use-after-free in mlx5_eswitch_termtbl_put. 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 25, 2026Updated Sep 25, 2026Source checked Sep 25, 2026First seen by HOL Sep 25, 2026Material review Sep 25, 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	>=10caabdaad5ace85577a453da97d1f8d3b944427 <304ea40ef4561671503c36e47da44a0a31b71e36 \|\| >=10caabdaad5ace85577a453da97d1f8d3b944427 <e393789e92310d7c66f57c876101779c90816a12 \|\| >=10caabdaad5ace85577a453da97d1f8d3b944427 <18b2969073879b9cce24e1a78b118bdad54518d1 \|\| >=10caabdaad5ace85577a453da97d1f8d3b944427 <7ee07f601f8f507c9faf25c68a49396ab8950596	304ea40ef4561671503c36e47da44a0a31b71e36, e393789e92310d7c66f57c876101779c90816a12, 18b2969073879b9cce24e1a78b118bdad54518d1, 7ee07f601f8f507c9faf25c68a49396ab8950596
Linux/Linuxgeneric	5.3	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 304ea40ef4561671503c36e47da44a0a31b71e36 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 25, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: net/mlx5: E-Switch: fix use-after-free in mlx5_eswitch_termtbl_put In mlx5_eswitch_termtbl_put(), the zero-ref cleanup check reads tt->ref_count after termtbl_mutex has been released. Two concurrent callers on the same mlx5_termtbl_handle race: one decrements ref_count to zero, removes the hash entry, and calls kfree(tt) while the other has already dropped the mutex and is about to evaluate if (!tt->ref_count), producing a use-after-free. Fix this by capturing the result of the decrement into a stack-local last variable before dropping the mutex. The cleanup decision is now made entirely under termtbl_mutex, and tt is not touched after kfree.

Quoted source text, attributed separately from HOL analysis.