PT-2025-14346 · Linux+2 · Linux Kernel+2

Published 2025-03-03 · Updated 2026-01-20 · CVE-2025-21965

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 kernel crash can occur if a BPF scheduler provides an invalid CPU as prev cpu to the scx bpf select cpu dfl() function. This issue is resolved by validating prev cpu in scx bpf select cpu dfl() and triggering an scx error if an invalid CPU is specified.

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

Exploit

Improper Resource Release

NULL Pointer Dereference

Weakness Enumeration

CWE-404

CWE-476

Related Identifiers

BDU:2025-11803

CVE-2025-21965

Affected Products

Astra Linux

Linux Kernel

Red Os

References · 24

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21965.json · Exploit
• http://repo.red-soft.ru/redos/8.0/x86_64/updates · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2025-20480.html · Vendor Advisory
• https://git.kernel.org/stable/c/752b56bb76e2471197d25d6948d85753043b10da · Patch
• https://ubuntu.com/security/CVE-2025-21965 · Vendor Advisory
• https://git.kernel.org/stable/c/9360dfe4cbd62ff1eb8217b815964931523b75b3 · Patch
• https://osv.dev/vulnerability/DEBIAN-CVE-2025-21965 · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2025-20530.html · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2025-21965 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-21965 · Security Note
• https://bdu.fstec.ru/vul/2025-11803 · Security Note
• https://osv.dev/vulnerability/BELL-CVE-2025-21965 · Vendor Advisory
• https://git.kernel.org/stable/c/515680e76c536dd4aa8e2b5d674b0d441baddf5b · Patch
• https://osv.dev/vulnerability/CVE-2025-21965 · Vendor Advisory
• https://wiki.astralinux.ru/astra-linux-se18-bulletin-2025-0811SE18 · Vendor Advisory