PT-2025-41079 · Linux+3 · Linux Kernel+3

Published 2023-11-07 · Updated 2026-04-20 · CVE-2023-53635

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description An issue was identified in the Linux kernel related to the netfilter conntrack functionality. The problem involves an incorrect timeout value for connection tracking entries (ct->timeout). Specifically, the timeout calculation was flawed for unconfirmed conntrack entries, leading to errors when setting and retrieving the timeout value. The issue stems from incorrectly adding or subtracting nfct time stamp during timeout management. The fix involves separating the timeout setting and getting processes and ensuring the timeout is set up after the IPS CONFIRMED flag is set.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Related Identifiers

ALSA-2025_16880

AZL-76410

CVE-2023-53635

RHSA-2023:6583

RHSA-2023_6583

SUSE-SU-2025:4189-1

Affected Products

Debian

Linux Kernel

Red Hat

Suse

References · 309

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53635.json · Exploit
• https://osv.dev/vulnerability/BELL-CVE-2023-53635 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-OS-UBUNTU-2204-CVE-2023-53635 · Vendor Advisory
• https://osv.dev/vulnerability/AZL-76410 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2023-53635 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2023-53635 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2023-53635 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2025:4189-1 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2023-53635 · Vendor Advisory
• https://ubuntu.com/security/CVE-2023-53635 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2023-53635 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2023-53635 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-11-CVE-2023-53635 · Vendor Advisory
• https://bugzilla.suse.com/1251210 · Note
• https://suse.com/security/cve/CVE-2023-53644 · Note