CVE-2023-52927: netfilter: allow exp not to be removed in nf_ct_find_expectation

High severity · published Mar 14, 2025

CVE-2023-52927

netfilter: allow exp not to be removed in nf_ct_find_expectation

7.8

CVSS

0.3%

EPSS

On KEV

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.

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack vector

Local

Complexity

Low

Privileges

Low

User interaction

None

Confidentiality

High

Integrity

High

Availability

High

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)0.3% · higher than 24% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

Kernel · Linux

5.18 before 6.1.130; 6.2 before 6.6 · source: NVD

Linux · Linux

1bc91a5ddf3eaea0e0ea957cccf3abdcfcace00e before 3fa58a6fbd1e9e5682d09cdafb08fba004cb12ec; 1bc91a5ddf3eaea0e0ea957cccf3abdcfcace00e before 4914109a8e1e494c6aa9852f9e84ec77a5fc643f; 5.18 · source: vendor

Debian Linux · Debian

11.0 · source: NVD

SIMATIC S7-1500 CPU 1518-4 PN/DP MFP · Siemens

V3.1.5; V3.1.6; V3.1.7; V3.1.5; V3.1.6; V3.1.7 · source: CISA

SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP · Siemens

V3.1.5; V3.1.6; V3.1.7; V3.1.5; V3.1.6; V3.1.7 · source: CISA

SIMATIC S7-1500 TM MFP - GNU/Linux subsystem · Siemens

0 · source: CISA

SIPLUS S7-1500 CPU 1518-4 PN/DP MFP · Siemens

V3.1.5; V3.1.6; V3.1.7 · source: CISA

In the news

VulnerabilityHigh

Siemens SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP

View CSAF Summary Multiple vulnerabilities have been identified in the additional GNU/Linux subsystem of the firmware version V3.1.6 for the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP (incl. SIPLUS variant). Siemens is preparing fix versions and recommends specific countermeasures for products where fixes are not, or not yet available. The following versions of Siemens SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP are affected: SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) vers:intdot/>=3.1.6 (CVE-2021-41617, CVE-2023-28531, CVE-2023-51384, CVE-2023-52927, CVE-2024-26783, CVE-2024-27056, CVE-2024-28956, CVE-2024-36903, CVE-2024-36927, CVE-2024-42079, CVE-2024-46786, CVE-2024-47736, CVE-2024-47809, CVE-2024-49968, CVE-2024-49994, CVE-2024-49998, CVE-2024-50014, CVE-2024-50063, CVE-2024-50164, CVE-2024-50298, CVE-2024-53124, CVE-2024-53170, CVE-2024-54458, CVE-2024-56631, CVE-2024-56703, CVE-2024-56719, CVE-2024-57917, CVE-2024-57924, CVE-2024-57973, CVE-2024-57977, CVE-2024-57979, CVE-2024-58011, CVE-2024-58016, CVE-2024-58020, CVE-2024-58056, CVE-2024-58058, CVE-2024-58061, CVE-2024-58086, CVE-2025-21645, CVE-2025-21648, CVE-2025-21655, CVE-2025-21676, CVE-2025-21682, CVE-2025-21702, CVE-2025-21705, CVE-2025-21706, CVE-2025-21707, CVE-2025-21718, CVE-2025-21731, CVE-2025-21745, CVE-2025-21758, CVE-2025-21760, CVE-2025-21764, CVE-2025-21765, CVE-2025-21780, CVE-2025-21795, CVE-2025-21796, CVE-2025-21802, CVE-2025-21814, CVE-2025-21846, CVE-2025-21853, CVE-2...

CVE-2021-41617 CVE-2023-28531 CVE-2023-51384

Jul 28, 2026·CISA Advisories

Affected product

Kernel

Linux

All Kernel CVEs

References

NVD

https://nvd.nist.gov/vuln/detail/CVE-2023-52927

CVE.org

https://www.cve.org/CVERecord?id=CVE-2023-52927

Broken Link