nexthop: Initialize extack in remove_nh_grp_entry() (CVE-2026-98031) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-98031

nexthop: Initialize extack in remove_nh_grp_entry()

Answer in brief

CVE-2026-98031 records a Unknown severity vulnerability in nexthop: Initialize extack in remove_nh_grp_entry(). 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	>=833a1065eeb14437a9a0dfa9dad06ea09894e0b5 <030c878eaedf0449e2b5401a0a0146d0afcc645e \|\| >=833a1065eeb14437a9a0dfa9dad06ea09894e0b5 <d643cea4248668dc493c513aa7cbc6505eb1a4a9 \|\| >=833a1065eeb14437a9a0dfa9dad06ea09894e0b5 <d80677ad7aa5bebfccfd58caa4852b65abe70561 \|\| >=833a1065eeb14437a9a0dfa9dad06ea09894e0b5 <5bd9e4e7cdaa03879e9b73b12ab52cceb1edd55b	030c878eaedf0449e2b5401a0a0146d0afcc645e, d643cea4248668dc493c513aa7cbc6505eb1a4a9, d80677ad7aa5bebfccfd58caa4852b65abe70561, 5bd9e4e7cdaa03879e9b73b12ab52cceb1edd55b
Linux/Linuxgeneric	5.11	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 030c878eaedf0449e2b5401a0a0146d0afcc645e 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: nexthop: Initialize extack in remove_nh_grp_entry() remove_nh_grp_entry() prints the extack message when a listener fails to replace the reduced nexthop group. However, extack is not initialized and listeners are not required to set a message when returning an error. Neither netdevsim nor mlxsw do so when an allocation fails, resulting in the dereference of an uninitialized stack pointer. Fix by zero-initializing extack, as was done in commit 6347c5314cee ("nexthop: initialize extack in nh_res_bucket_migrate()").

Quoted source text, attributed separately from HOL analysis.