Medium

CVE-2026-43024 — netfilter: nf_tables: reject immediate NF_QUEUE verdict

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: reject immediate NF_QUEUE verdict nft_queue is always used from userspace nftables to deliver the NF_QUEUE verdict. Immediately emitting an NF_QUEUE verdict is never used by the userspace nft tools, so reject immediate NF_QUEUE verdicts. The arp family does not provide queue support, but such an immediate verdict is still reachable. Globally reject NF_QUEUE immediate verdicts to address this issue.

Published May 1, 2026 · Updated Oct 14, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP, GitHub Security Advisories · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.2% (30-day exploitation probability)+1
Technical severity (medium)+3

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.17%

ahead of 6% of scored CVEs · Oct 14, 2026

Affects

Linux

Linux and 1 more

CVSS base

5.5

Medium · 2 source(s)

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

Documented patch — git.kernel.org (NIST National Vulnerability Database)
Documented patch — git.kernel.org (NIST National Vulnerability Database)
Documented patch — git.kernel.org (NIST National Vulnerability Database)
Documented patch — git.kernel.org (NIST National Vulnerability Database)
Documented patch — git.kernel.org (NIST National Vulnerability Database)
Documented patch — git.kernel.org (NIST National Vulnerability Database)
Documented patch — git.kernel.org (NIST National Vulnerability Database)
Documented patch — git.kernel.org (NIST National Vulnerability Database)

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux, Linux Linux Kernel).
Apply the fixed version or the patch documented under Remediation.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	version 6.8≥ 55a60251fa50d4e68175e36666b536a602ce4f6c and < 2f7f825a548be55420f0f5f716f6c27b9d312d3f≥ 960cf4f812530f01f6acc6878ceaa5404c06af7b and < f140593901724cfbd16597c3a4fcb24a58ae44b0≥ 8e34430e33b8a80bc014f3efe29cac76bc30a4b4 and < 68390437a998c3f2c57212b413abef5e6d657d88≥ 6653118b176a00915125521c6572ae8e507621db and < 4b12a3cc3f075e750cc3c5e693fd25fb400af4a2≥ f342de4e2f33e0e39165d8639387aa6c19dff660 and < f710691be163ae6b39e4bcab9e5be32d329f035b≥ f342de4e2f33e0e39165d8639387aa6c19dff660 and < 42a47f4b1b7695026ab9bc1bb35d4622b0835c95≥ f342de4e2f33e0e39165d8639387aa6c19dff660 and < 17dc5d5a935c771338430cbc156a16a51cfd31e8 and 11 more ≥ f342de4e2f33e0e39165d8639387aa6c19dff660 and < da107398cbd4bbdb6bffecb2ce86d5c9384f4cecversion 8365e9d92b85fda975a5ece7a3a139cb964018c8version 4e66422f1b56149761dc76030e6345d1cca6f869version f05a497e7bc8851eeeb3a58da180ba469efebb05≥ 5.10.210 and < 5.10.253≥ 5.15.149 and < 5.15.203≥ 6.1.76 and < 6.1.168≥ 6.6.15 and < 6.6.134≥ 4.19.307 and < 4.20≥ 5.4.269 and < 5.5≥ 6.7.3 and < 6.8	Vulnerable	CVE Program (cve.org) e CISA ADP
Linux	Linux Kernel	version 7.0-rc5version 7.0-rc6version 6.8-rc2≥ 5.4.269 and < 5.5≥ 5.10.210 and < 5.10.253≥ 5.15.149 and < 5.15.203≥ 6.1.76 and < 6.1.168≥ 6.6.15 and < 6.6.134 and 15 more ≥ 6.7.3 and < 6.8≥ 6.8.1 and < 6.12.81≥ 6.13 and < 6.18.22≥ 6.19 and < 6.19.12version 6.8≥ 4.19.307 and < 4.20version 6.8-rc3version 6.8-rc4version 6.8-rc5version 6.8-rc6version 6.8-rc7version 7.0-rc1version 7.0-rc2version 7.0-rc3version 7.0-rc4	Vulnerable	NIST National Vulnerability Database

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Local

Attack complexity

Low

Privileges required

Low

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
5.5	CVSS 3.1	Medium	1.8	3.6	nvd@nist.gov via NIST National Vulnerability Database
5.5	CVSS 3.1	Medium	—	—	GitHub, Inc. via GitHub Security Advisories

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H (score shown at the top: nvd@nist.gov)

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 0.17%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Local/physical vector: focus on endpoint telemetry (EDR) from affected hosts.

endpoint telemetry (EDR)

Timeline

What happened to this CVE, newest first.

2026
Affected products added · linux/linux
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 13, 2026
Fix documented
Oct 13, 2026 · NIST National Vulnerability Database
CVSS changed · 5.5
Oct 13, 2026 · NIST National Vulnerability Database
Source status changed · → Modified
Oct 13, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 13, 2026 · NIST National Vulnerability Database
CVE published
May 1, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

2× References added · Oct 14, 2026 – Oct 14, 2026
1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

13 on the record

git.kernel.org/stable/c/2f7f825a548be55420f0f5f716f6c27b9d312d3f
Patch, NIST National Vulnerability Database
git.kernel.org/stable/c/f140593901724cfbd16597c3a4fcb24a58ae44b0
Patch, NIST National Vulnerability Database
git.kernel.org/stable/c/17dc5d5a935c771338430cbc156a16a51cfd31e8
Patch, NIST National Vulnerability Database
git.kernel.org/stable/c/4b12a3cc3f075e750cc3c5e693fd25fb400af4a2
Patch, NIST National Vulnerability Database
git.kernel.org/stable/c/da107398cbd4bbdb6bffecb2ce86d5c9384f4cec
Patch, NIST National Vulnerability Database
git.kernel.org/stable/c/42a47f4b1b7695026ab9bc1bb35d4622b0835c95
Patch, NIST National Vulnerability Database
git.kernel.org/stable/c/f710691be163ae6b39e4bcab9e5be32d329f035b
Patch, NIST National Vulnerability Database
git.kernel.org/stable/c/68390437a998c3f2c57212b413abef5e6d657d88
Patch, NIST National Vulnerability Database
github.com/advisories/GHSA-g9qr-gmhx-8q7c
GitHub Security Advisories
cert-portal.siemens.com/productcert/html/ssa-082556.html
NIST National Vulnerability Database
nvd.nist.gov/vuln/detail/CVE-2026-43024
GitHub Security Advisories
cert-portal.siemens.com/productcert/html/ssa-457936.html
NIST National Vulnerability Database
cert-portal.siemens.com/productcert/html/ssa-019113.html
NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Critical CVE-2026-99999 ipv4: validate checksum_start before completing checksum 12h
Unknown CVE-2026-98432 ipv4: free inet_opt and ireq_opt after an RCU grace period 12h
Unknown CVE-2026-98424 wifi: cfg80211: undo netns switch if renaming the wiphy fails 1d
Unknown CVE-2026-98425 wifi: mac80211: don't warn when an IBSS has no channel to scan 1d
Unknown CVE-2026-98426 wifi: mwifiex: fix IRQ leak using wrong index in MSI-X error path 1d
Unknown CVE-2026-98427 net/sched: codel: bound the dropping loop per dequeue call 1d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-43024 is "netfilter: nf_tables: reject immediate NF_QUEUE verdict", rated Medium. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 5.5 describes technical severity. EPSS 0.17% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

Comments

Moderated technical discussion. Read the community guidelines.

No comments yet.