CVE-2023-52927

Published Mar 14, 2025

Last updated a month ago

Linux Kernel

Overview

AI description

Automated description summarized from trusted sources.

CVE-2023-52927 is a vulnerability found in the Linux kernel's netfilter subsystem, specifically affecting the handling of connection tracking expectations. The vulnerability arises in the `nf_ct_find_expectation` function, where connection tracking expectations (`exp`) are prematurely removed from the hash table. This occurs when `nf_conntrack_in()` calls `nf_ct_find_expectation()`. The issue impacts scenarios where the created connection tracking entry is not immediately confirmed, such as in Open vSwitch (OVS) and TC conntrack setups. A patch was developed to address this by allowing the expectation to remain in the hash table by setting `IPS_CONFIRMED` in the status of the template. The fix involves modifications to files including `nfconntrackexpect.h`, `nfconntrackcore.c`, `nfconntrackexpect.c`, and `nft_ct.c`.

Description: In the Linux kernel, the following vulnerability has been resolved: netfilter: allow exp not to be removed in nf_ct_find_expectation Currently nf_conntrack_in() calling nf_ct_find_expectation() will remove the exp from the hash table. However, in some scenario, we expect the exp not to be removed when the created ct will not be confirmed, like in OVS and TC conntrack in the following patches. This patch allows exp not to be removed by setting IPS_CONFIRMED in the status of the tmpl.
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
NVD status: Modified
Products: linux_kernel, debian_linux

Risk scores

CVSS 3.1

Type: Primary
Base score: 7.8
Impact score: 5.9
Exploitability score: 1.8
Vector string: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Severity: HIGH

Weaknesses

nvd@nist.gov: CWE-416

Hype score: Not currently trending

Configurations

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References

Sources include official advisories and independent security research.