CVE-2023-53566

MEDIUM EPSS 2.9%
Published Oct 4, 20259mo ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Oct 4, 2025 9mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
2.9% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 10

VendorProductVersionRange
linuxlinux_kernel*≥5.10.166  –  <5.10.181
linuxlinux_kernel*≥5.15.91  –  <5.15.113
linuxlinux_kernel*≥6.1.9  –  <6.1.30
linuxlinux_kernel*≥6.2.1  –  <6.3.4
linuxlinux_kernel6.2any
linuxlinux_kernel6.2any
linuxlinux_kernel6.2any
linuxlinux_kernel6.2any
linuxlinux_kernel6.4any
linuxlinux_kernel6.4any

References 7

  • git.kernel.org https://git.kernel.org/stable/c/3fa13203b6d90cc3a33af47b058739f92ab82eef
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/61ae320a29b0540c16931816299eb86bf2b66c08
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/899aa5638568abf5d69de7a7bb95e4615157375b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a337706c1fb35aac3f26b48aca80421bdbe1d33a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a836be60a3aabcedcd9c79f545d409ace1f20ba6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b76db53ee8802ee5683f8cb401d7e2ec6f9b3d56
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ec5caa765f7f6960011c919c9aeb1467940421f6
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/3fa13203b6d90cc3a33af47b058739f92ab82eef
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/61ae320a29b0540c16931816299eb86bf2b66c08
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/899aa5638568abf5d69de7a7bb95e4615157375b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a337706c1fb35aac3f26b48aca80421bdbe1d33a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a836be60a3aabcedcd9c79f545d409ace1f20ba6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b76db53ee8802ee5683f8cb401d7e2ec6f9b3d56
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ec5caa765f7f6960011c919c9aeb1467940421f6
    Patch