PT-2025-8883 · Linux+1 · Linux Kernel+1

Published 2025-01-27 · Updated 2025-11-11 · CVE-2025-21771

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 vulnerability in the Linux kernel has been resolved, related to incorrect autogroup migration detection. The issue occurred because the scx move task() function, which is called from sched move task(), could not properly distinguish between cgroup and autogroup migrations. This led to incorrect ignoring of a migration from a non-root cgroup to an autogroup of the root cgroup, triggering a warning. The vulnerability is related to the sched ext component and the scx cgroup can attach() function.

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

Exploit

Information Disclosure

Weakness Enumeration

CWE-200

Related Identifiers

ALSA-2025:20095

BDU:2025-11964

CVE-2025-21771

RHSA-2025:20095

Affected Products

Astra Linux

Linux Kernel

References · 201

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21771.json · Exploit
• https://git.kernel.org/stable/c/d6f3e7d564b2309e1f17e709a70eca78d7ca2bb8 · Patch
• https://osv.dev/vulnerability/DEBIAN-CVE-2025-21771 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2025-21771 · Vendor Advisory
• https://git.kernel.org/stable/c/d8b510d0ddc65d8a71e0f9a3acc9ed5f010fc514 · Patch
• https://osv.dev/vulnerability/BELL-CVE-2025-21771 · Vendor Advisory
• https://osv.dev/vulnerability/ALSA-2025:20095 · Vendor Advisory
• https://bdu.fstec.ru/vul/2025-11964 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-21771 · Security Note
• https://git.kernel.org/stable/c/75bf2f80c046d2ec5a07455891ea0a9fb6d8b5f6 · Patch
• https://cve.org/CVERecord?id=CVE-2025-21771 · Security Note
• https://ubuntu.com/security/CVE-2025-21771 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2025-21771 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2025-21771 · Vendor Advisory
• https://errata.almalinux.org/10/ALSA-2025-20095.html · Vendor Advisory