netfilter: nfnetlink_log: cope with concurrent instance destruction (CVE-2026-97998) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-97998

netfilter: nfnetlink_log: cope with concurrent instance destruction

Answer in brief

CVE-2026-97998 records a Unknown severity vulnerability in netfilter: nfnetlink_log: cope with concurrent instance destruction. 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	>=0597f2680d666a3bcf101ac0c771ba7e50016bbd <0234d7ca0317be0a623300e1693cd794bbfdf8af \|\| >=0597f2680d666a3bcf101ac0c771ba7e50016bbd <1a7a8ac9a9f0ad0d410c901cb6f233833518844c \|\| >=0597f2680d666a3bcf101ac0c771ba7e50016bbd <e2dd0f1f8c4e6334699ea6382e52f6da0c7e45eb \|\| >=0597f2680d666a3bcf101ac0c771ba7e50016bbd <387d744fa7e499d2c3748a4e60e02ebb24e7fb16	0234d7ca0317be0a623300e1693cd794bbfdf8af, 1a7a8ac9a9f0ad0d410c901cb6f233833518844c, e2dd0f1f8c4e6334699ea6382e52f6da0c7e45eb, 387d744fa7e499d2c3748a4e60e02ebb24e7fb16
Linux/Linuxgeneric	2.6.14	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 0234d7ca0317be0a623300e1693cd794bbfdf8af 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: netfilter: nfnetlink_log: cope with concurrent instance destruction Instances are refcounted. However, only memory release happens on the 1 -> 0 transition; the unlink from hashes can occur with any refcount. Uncooperative userspace can force a situation where a queue is pending for destruction from netlink event while a different socket with same portid processes an UNBIND request. With right timing, this will unhash the instance again: Oops: general protection fault, [..] Call Trace: <TASK> nfulnl_recv_config+0x31a/0xd50 nfnetlink_rcv_msg+0x7c2/0xeb0

Quoted source text, attributed separately from HOL analysis.