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CVE-2023-53566
netfilter: nft_set_rbtree: fix null deref on element insertion
Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_set_rbtree: fix null deref on element insertion There is no guarantee that rb_prev() will not return NULL in nft_rbtree_gc_elem(): general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] nft_add_set_elem+0x14b0/0x2990 nf_tables_newsetelem+0x528/0xb30 Furthermore, there is a possible use-after-free while iterating, 'node' can be free'd so we need to cache the next value to use.

INFO

Published Date :

Oct. 4, 2025, 4:15 p.m.

Last Modified :

Oct. 6, 2025, 2:56 p.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products

The following products are affected by CVE-2023-53566 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Solution
Apply kernel updates to fix null dereference and use-after-free vulnerabilities.
  • Update the Linux kernel to the latest version.
  • Apply security patches for the netfilter module.
  • Reboot the system after applying updates.
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2023-53566.

URL Resource
https://git.kernel.org/stable/c/3fa13203b6d90cc3a33af47b058739f92ab82eef
https://git.kernel.org/stable/c/61ae320a29b0540c16931816299eb86bf2b66c08
https://git.kernel.org/stable/c/899aa5638568abf5d69de7a7bb95e4615157375b
https://git.kernel.org/stable/c/a337706c1fb35aac3f26b48aca80421bdbe1d33a
https://git.kernel.org/stable/c/a836be60a3aabcedcd9c79f545d409ace1f20ba6
https://git.kernel.org/stable/c/b76db53ee8802ee5683f8cb401d7e2ec6f9b3d56
https://git.kernel.org/stable/c/ec5caa765f7f6960011c919c9aeb1467940421f6
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2023-53566 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2023-53566 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2023-53566 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2023-53566 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Oct. 04, 2025

    Action Type Old Value New Value
    Added Description In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_set_rbtree: fix null deref on element insertion There is no guarantee that rb_prev() will not return NULL in nft_rbtree_gc_elem(): general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] nft_add_set_elem+0x14b0/0x2990 nf_tables_newsetelem+0x528/0xb30 Furthermore, there is a possible use-after-free while iterating, 'node' can be free'd so we need to cache the next value to use.
    Added Reference https://git.kernel.org/stable/c/3fa13203b6d90cc3a33af47b058739f92ab82eef
    Added Reference https://git.kernel.org/stable/c/61ae320a29b0540c16931816299eb86bf2b66c08
    Added Reference https://git.kernel.org/stable/c/899aa5638568abf5d69de7a7bb95e4615157375b
    Added Reference https://git.kernel.org/stable/c/a337706c1fb35aac3f26b48aca80421bdbe1d33a
    Added Reference https://git.kernel.org/stable/c/a836be60a3aabcedcd9c79f545d409ace1f20ba6
    Added Reference https://git.kernel.org/stable/c/b76db53ee8802ee5683f8cb401d7e2ec6f9b3d56
    Added Reference https://git.kernel.org/stable/c/ec5caa765f7f6960011c919c9aeb1467940421f6
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
No CVSS metrics available for this vulnerability.