PT-2025-49675 · Linux · Linux Kernel

CVE-2023-53815 · Published 2025-08-12 · Updated 2026-03-24

Positive Technologies (AI Summary)

CVSS v2.0

4.6

Medium

Base vector

AV:L/AC:L/Au:S/C:N/I:N/A:C

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

Description The Linux kernel contains a flaw in the posix-timers functionality, specifically within the itimer delete() function. A retry loop within this function, when handling concurrent timer expiration, can lead to a real-time livelock situation on RT kernels and systems with HAVE POSIX CPU TIMERS TASK WORK enabled. This occurs when a task preempts the task responsible for timer delivery. The issue is addressed by replacing spin unlock() with a call to timer wait running() to align the handling with other retry loops in the posix timer code.

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

Exploit

Infinite Loop

Weakness Enumeration

CWE-835

Related Identifiers

BDU:2026-05111

CVE-2023-53815

SUSE-SU-2026:0278-1

SUSE-SU-2026:0281-1

SUSE-SU-2026:0293-1

SUSE-SU-2026:0315-1

SUSE-SU-2026:20477-1

SUSE-SU-2026:20498-1

SUSE-SU-2026:20845-1

SUSE-SU-2026:20876-1

Affected Products

Linux Kernel

References · 1465

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53815.json · Exploit
• https://ubuntu.com/security/CVE-2023-53815 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2023-53815 · Security Note
• https://osv.dev/vulnerability/CVE-2023-53815 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2023-53815 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:20845-1 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2023-53815 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:0281-1 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2023-53815 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:20876-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:0293-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:20498-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:20477-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:0278-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:0315-1 · Vendor Advisory