PT-2025-20532 · Linux+2 · Linux Kernel+2

Published 2025-03-18 · Updated 2026-05-26 · CVE-2025-37880

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 A issue in the Linux kernel has been identified where the sched yield syscall may not cause scheduling in time-travel mode, potentially leading to extreme slowdown or deadlock. This is due to a badly implemented userspace spinlock. The problem arises because no time has passed in time-travel mode, so sched yield by a userspace does not actually yield. The issue is affected by the kernel configuration, specifically CONFIG UML MAX USERSPACE ITERATIONS.

Recommendations As a temporary workaround, consider accounting time to the process whenever it executes a sched yield syscall to mitigate the issue. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Improper Locking

Weakness Enumeration

CWE-667

CWE-834

Related Identifiers

BDU:2026-01388

CVE-2025-37880

ECHO-F6DF-02E5-95B4

USN-7594-1

USN-7594-2

USN-7594-3

Affected Products

Debian

Linux Kernel

Ubuntu

References · 367

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/37xxx/CVE-2025-37880.json · Exploit
• https://security-tracker.debian.org/tracker/CVE-2025-37880 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-22072 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-22025 · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2025-20530.html · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-37873 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-22064 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-22094 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40325 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-37872 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-22079 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-OS-UBUNTU-2404-CVE-2025-37880 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-22073 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-37767 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-22023 · Vendor Advisory