CVE-2023-31248

Name: CVE-2023-31248
Creator: NVD / NIST
Published: 2023-07-05T19:15:09.713+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 2.16%

Last modified Jun 17, 2026

CVE-2023-31248 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. Linux Kernel nftables Use-After-Free Local Privilege Escalation Vulnerability; `nft_chain_lookup_byid()` failed to check whether a chain was active and CAP_NET_ADMIN is in any user or network namespace. EPSS estimates a 2.16% chance of exploitation in the next 30 days.

Description

Linux Kernel nftables Use-After-Free Local Privilege Escalation Vulnerability; `nft_chain_lookup_byid()` failed to check whether a chain was active and CAP_NET_ADMIN is in any user or network namespace

Metrics

CVSS 3.1

7.8/10

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

EPSS Probability

2.16%

79.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Linux	Linux Kernel	>= 5.9, < 5.10.188
Linux	Linux Kernel	>= 5.11, < 5.15.121
Linux	Linux Kernel	>= 5.16, < 6.1.39
Linux	Linux Kernel	>= 6.2, < 6.4.4
Fedoraproject	Fedora	37
Fedoraproject	Fedora	38
Debian	Debian Linux	11.0
Canonical	Ubuntu Linux	14.04
Canonical	Ubuntu Linux	16.04
Canonical	Ubuntu Linux	18.04
Canonical	Ubuntu Linux	20.04
Canonical	Ubuntu Linux	22.04

References

http://packetstormsecurity.com/files/173757/Kernel-Live-Patch-Security-Notice-LSN-0096-1.htmlThird Party Advisory, VDB Entry
http://packetstormsecurity.com/files/174577/Kernel-Live-Patch-Security-Notice-LSN-0097-1.htmlThird Party Advisory, VDB Entry
http://www.openwall.com/lists/oss-security/2023/07/05/2Mailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/08/msg00001.htmlThird Party Advisory, VDB Entry
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RGZC5XOANA75OJ4XARBBXYSLDKUIJI5E/Mailing List
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UPHI46ROSSLVAV4R5LJWJYU747JGOS6D/Mailing List
https://lore.kernel.org/netfilter-devel/20230705121627.GC19489@breakpoint.cc/T/Patch
https://security.netapp.com/advisory/ntap-20240201-0001/
https://www.debian.org/security/2023/dsa-5453Third Party Advisory
https://www.openwall.com/lists/oss-security/2023/07/05/2Mailing List
http://packetstormsecurity.com/files/173757/Kernel-Live-Patch-Security-Notice-LSN-0096-1.htmlThird Party Advisory, VDB Entry
http://packetstormsecurity.com/files/174577/Kernel-Live-Patch-Security-Notice-LSN-0097-1.htmlThird Party Advisory, VDB Entry
http://www.openwall.com/lists/oss-security/2023/07/05/2Mailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/08/msg00001.htmlThird Party Advisory, VDB Entry
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RGZC5XOANA75OJ4XARBBXYSLDKUIJI5E/Mailing List
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UPHI46ROSSLVAV4R5LJWJYU747JGOS6D/Mailing List
https://lore.kernel.org/netfilter-devel/20230705121627.GC19489@breakpoint.cc/T/Patch
https://security.netapp.com/advisory/ntap-20240201-0001/
https://www.debian.org/security/2023/dsa-5453Third Party Advisory
https://www.openwall.com/lists/oss-security/2023/07/05/2Mailing List

Timeline

Published: Jul 5, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-31248?

How severe is CVE-2023-31248?

CVE-2023-31248 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 2.16% probability of exploitation in the next 30 days.

How do I fix CVE-2023-31248?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-31248?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST