High 7.8Published Jul 31, 2023

CVE-2023-4004Kernel: netfilter: use-after-free due to improper element removal in nft_pipapo_remove()

Updated under an hour ago (Oct 26, 2026, 1:23 PM ET)

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It affects Red Hat Enterprise Linux 8 and 13 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Red Hat Enterprise Linux 8

Exploited in the last 30 days

A use-after-free flaw was found in the Linux kernel's netfilter in the way a user triggers the nft_pipapo_remove function with the element, without a NFT_SET_EXT_KEY_END. This issue could allow a local user to crash the system or potentially escalate their privileges on the system.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-416
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: redhat
NVD analysis: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

Red Hat Red Hat Enterprise Linux 8 redhat:enterprise_linux	from 0:4.18.0-477.27.1.rt7.290.el8_8 not affected	CNA record
Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support redhat:rhel_e4s	from 0:4.18.0-193.119.1.el8_2 not affected	CNA record
Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support redhat:rhel_aus	from 0:4.18.0-193.119.1.el8_2 not affected	CNA record
Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support redhat:rhel_tus	from 0:4.18.0-193.119.1.el8_2 not affected	CNA record
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support redhat:rhel_eus	8.6	CNA record
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support redhat:rhev_hypervisor	from 0:4.18.0-372.75.1.el8_6 not affected	CNA record
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	before V1.1	CISA ADP
linux linux_kernel linux:linux_kernel	from 5.6 before 5.10.188; from 5.11 before 5.15.123; from 5.16 before 6.1.42; from 6.2 before 6.4.7	NVD
fedoraproject fedora fedoraproject:fedora	38	NVD
redhat enterprise_linux redhat:enterprise_linux	8.0; 9.0	NVD
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References

References

https://access.redhat.com/errata/RHSA-2023:4961	vendor-advisory, x-refsource-redhat, third-party-advisory
https://access.redhat.com/errata/RHSA-2023:4962	vendor-advisory, x-refsource-redhat, third-party-advisory
https://access.redhat.com/errata/RHSA-2023:4967	vendor-advisory, x-refsource-redhat, third-party-advisory
https://access.redhat.com/errata/RHSA-2023:5069	vendor-advisory, x-refsource-redhat, third-party-advisory
https://access.redhat.com/errata/RHSA-2023:5091	vendor-advisory, x-refsource-redhat, third-party-advisory
https://access.redhat.com/errata/RHSA-2023:5093	vendor-advisory, x-refsource-redhat, broken-link, third-party-advisory
https://access.redhat.com/errata/RHSA-2023:5221	vendor-advisory, x-refsource-redhat, third-party-advisory
https://access.redhat.com/errata/RHSA-2023:5244	vendor-advisory, x-refsource-redhat, third-party-advisory
https://access.redhat.com/errata/RHSA-2023:5255	vendor-advisory, x-refsource-redhat, third-party-advisory
https://access.redhat.com/errata/RHSA-2023:5548	vendor-advisory, x-refsource-redhat, third-party-advisory
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.