CVE-2023-53566 Details
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.
A null pointer dereference vulnerability has been identified in the Linux kernel's netfilter component, specifically within the RBTree element insertion process. This issue arises because the function 'rb_prev()' can return NULL, leading to a general protection fault. The vulnerability is associated with non-canonical addresses, causing a null pointer dereference error. Additionally, there is a potential use-after-free vulnerability when iterating through nodes, as a 'node' can be freed, necessitating the caching of the next value for continued iteration.
Users can upgrade to the latest version of the Linux kernel where this vulnerability has been patched. Instructions for downloading the updated kernel can be found on the official Linux kernel website.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/3fa13203b6d90cc3a33af47b058739f92ab82eef | kernel.org | Patch |
| https://git.kernel.org/stable/c/61ae320a29b0540c16931816299eb86bf2b66c08 | kernel.org | Patch |
| https://git.kernel.org/stable/c/899aa5638568abf5d69de7a7bb95e4615157375b | kernel.org | Patch |
| https://git.kernel.org/stable/c/a337706c1fb35aac3f26b48aca80421bdbe1d33a | kernel.org | Patch |
| https://git.kernel.org/stable/c/a836be60a3aabcedcd9c79f545d409ace1f20ba6 | kernel.org | Patch |
| https://git.kernel.org/stable/c/b76db53ee8802ee5683f8cb401d7e2ec6f9b3d56 | kernel.org | Patch |
| https://git.kernel.org/stable/c/ec5caa765f7f6960011c919c9aeb1467940421f6 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-476 | NULL Pointer Dereference | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 5.10.166, < 5.10.181 >= 5.15.91, < 5.15.113 >= 6.1.9, < 6.1.30 >= 6.2.1, < 6.3.4 6.2 - 6.2 rc6 6.2 rc7 6.2 rc8 6.4 rc1 6.4 rc2 |
CPE
Remediation
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Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Aug 4, 2026 | CVE Modified | kernel.org |
| Jun 17, 2026 | CVE Modified | kernel.org |
| Mar 21, 2026 | Modified Analysis | [email protected] |
| Feb 6, 2026 | Initial Analysis | [email protected] |
| Oct 4, 2025 | New CVE Received | kernel.org |