PT-2025-40632 · Linux · Linux Kernel

Published 2025-09-13 · Updated 2025-10-04 · CVE-2025-39936

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 versions prior to 6.17.0-rc4+ #1

Description The Linux kernel contained an issue in the crypto/ccp module where the sev platform shutdown locked() function was called with a NULL argument, leading to a NULL pointer dereference during suspend to disk. This occurred because an error pointer was not consistently passed to the function. The issue was addressed by ensuring a pointer to a function-local error variable is passed in the caller. This resulted in proper error reporting during suspension and shutdown of the ccp driver.

Recommendations Update to a version newer than 6.17.0-rc4+ #1.

Exploit

Fix

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

BDU:2026-04496

CVE-2025-39936

Affected Products

Linux Kernel

References · 16

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39936.json · Exploit
• https://security-tracker.debian.org/tracker/CVE-2025-39936 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2025-39936 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-39936 · Vendor Advisory
• https://git.kernel.org/stable/c/bc509293c9d4f4f74e776f4a0bbb61f63c041938 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2025-39936 · Security Note
• https://osv.dev/vulnerability/CVE-2025-39936 · Vendor Advisory
• https://git.kernel.org/stable/c/46834d90a9a13549264b9581067d8f746b4b36cc · Patch
• https://cve.org/CVERecord?id=CVE-2025-39936 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2025-39936 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-04496 · Security Note
• https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git · Note
• https://kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.16.9 · Note
• https://t.me/CVEtracker/34098 · Telegram Post
• https://twitter.com/CVEnew/status/1974378042144534776 · Twitter Post