CVE-2023-53566

Severity CVSS v4.0:

Pending analysis

Type:

CWE-476 NULL Pointer Dereference

Publication date:

04/10/2025

Last modified:

06/02/2026

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, &#39;node&#39; can be free&#39;d so we need to cache the next value to use.

Impact

Vector 3.x

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 5.50 MEDIUM
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x

5.50

Severity 3.x

MEDIUM

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:o:linux:linux_kernel::::::::	5.10.166 (including)	5.10.181 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.15.91 (including)	5.15.113 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	6.1.9 (including)	6.1.30 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	6.2.1 (including)	6.3.4 (excluding)
cpe:2.3:o:linux:linux_kernel:6.2:-::::::
cpe:2.3:o:linux:linux_kernel:6.2:rc6::::::
cpe:2.3:o:linux:linux_kernel:6.2:rc7::::::
cpe:2.3:o:linux:linux_kernel:6.2:rc8::::::
cpe:2.3:o:linux:linux_kernel:6.4:rc1::::::
cpe:2.3:o:linux:linux_kernel:6.4:rc2::::::

To consult the complete list of CPE names with products and versions, see this page

CVE-2023-53566

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools