CVE-2023-53619

HIGH EPSS 9.7%
Published Oct 7, 20258mo ago · Modified Jun 17, 20261w ago
7.8 CVSS 3.1
High
Find Similar
Published Oct 7, 2025 8mo ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: conntrack: Avoid nf_ct_helper_hash uses after free If nf_conntrack_init_start() fails (for example due to a register_nf_conntrack_bpf() failure), the nf_conntrack_helper_fini() clean-up path frees the nf_ct_helper_hash map. When built with NF_CONNTRACK=y, further netfilter modules (e.g: netfilter_conntrack_ftp) can still be loaded and call nf_conntrack_helpers_register(), independently of whether nf_conntrack initialized correctly. This accesses the nf_ct_helper_hash dangling pointer and causes a uaf, possibly leading to random memory corruption. This patch guards nf_conntrack_helper_register() from accessing a freed or uninitialized nf_ct_helper_hash pointer and fixes possible uses-after-free when loading a conntrack module.

CVSS Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
9.7% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-416 Use After Free Memory Safety

Affected Products 8

VendorProductVersionRange
linuxlinux_kernel*≥3.6  –  <4.14.322
linuxlinux_kernel*≥4.15  –  <4.19.291
linuxlinux_kernel*≥4.20  –  <5.4.251
linuxlinux_kernel*≥5.5  –  <5.10.188
linuxlinux_kernel*≥5.11  –  <5.15.121
linuxlinux_kernel*≥5.16  –  <6.1.39
linuxlinux_kernel*≥6.2  –  <6.4.4
linuxlinux_kernel6.5any

References 8

  • git.kernel.org https://git.kernel.org/stable/c/00716f25f9697d02a0d9bd622575c7c7321ba3d0
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/05561f822f27b9fa88fa5504ddec34bf38833034
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4ee69c91cb8f9ca144bc0861969e5a1a3c6152a7
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/61c7a5256543ae7d24cd9d21853d514c8632e1e9
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6eef7a2b933885a17679eb8ed0796ddf0ee5309b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6f03ce2f1abcb9f9d0511e3659ca6eb60e39f566
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8289d422f5e484efe4a565fe18e862ecd621c175
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/fce5cc7cbd4b92f979bf02c9ec5fb69aaeba92d7
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/00716f25f9697d02a0d9bd622575c7c7321ba3d0
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/05561f822f27b9fa88fa5504ddec34bf38833034
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4ee69c91cb8f9ca144bc0861969e5a1a3c6152a7
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/61c7a5256543ae7d24cd9d21853d514c8632e1e9
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6eef7a2b933885a17679eb8ed0796ddf0ee5309b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6f03ce2f1abcb9f9d0511e3659ca6eb60e39f566
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8289d422f5e484efe4a565fe18e862ecd621c175
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/fce5cc7cbd4b92f979bf02c9ec5fb69aaeba92d7
    Patch