PT-2025-40708 · Linux+2 · Linux Kernel+2

Published 2023-11-07 · Updated 2025-12-04 · CVE-2023-53566

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description The Linux kernel contains a flaw within the netfilter module, specifically in the nft set rbtree function, related to element insertion. A null dereference can occur during element insertion due to the potential for rb prev() to return NULL within nft rbtree gc elem(). Additionally, a use-after-free condition exists during iteration, where the node can be freed, necessitating caching of the next value for use. This can lead to a general protection fault. The nft add set elem and nf tables newsetelem functions are involved in the issue.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

ALSA-2025_16880

CVE-2023-53566

RHSA-2023:6583

RHSA-2023_6583

RHSA-2024:3421

SUSE-SU-2025:4111-1

SUSE-SU-2025:4135-1

SUSE-SU-2025:4139-1

SUSE-SU-2025:4149-1

SUSE-SU-2025:4188-1

SUSE-SU-2025:4320-1

Affected Products

Linux Kernel

Red Hat

Suse

References · 472

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53566.json · Exploit
• https://osv.dev/vulnerability/CVE-2023-53566 · Vendor Advisory
• https://git.kernel.org/stable/c/b76db53ee8802ee5683f8cb401d7e2ec6f9b3d56 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2023-53566 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2023-53566 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2025:4111-1 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2023-53566 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2025:4135-1 · Vendor Advisory
• https://git.kernel.org/stable/c/ec5caa765f7f6960011c919c9aeb1467940421f6 · Patch
• https://cve.org/CVERecord?id=CVE-2023-53566 · Security Note
• https://osv.dev/vulnerability/BELL-CVE-2023-53566 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2025:4320-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2025:4149-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2025:4139-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2023-53566 · Vendor Advisory