PT-2025-40086 · Linux+1 · Linux Kernel+1

Published 2025-09-19 · Updated 2025-10-03 · CVE-2025-39912

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 flaw exists in the Linux kernel’s nfs/localio functionality. Specifically, the issue involves improper credential handling when releasing pageio data, potentially triggering a bug in the put cred() function if the nfsd file is released immediately. This can occur when the nfsd filecache code releases the nfsd file, leading to a condition where the credential check fails (BUG ON(cred == current->cred)).

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

Exploit

Weakness Enumeration

CWE-672

Related Identifiers

BDU:2026-02756

CVE-2025-39912

Affected Products

Astra Linux

Linux Kernel

References · 20

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39912.json · Exploit
• https://cve.org/CVERecord?id=CVE-2025-39912 · Security Note
• https://ubuntu.com/security/CVE-2025-39912 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2025-39912 · Vendor Advisory
• https://wiki.astralinux.ru/astra-linux-se18-bulletin-2026-0224SE18 · Vendor Advisory
• https://git.kernel.org/stable/c/c250be1d75bf80dc5ab46f0b434b746c1868a1ea · Patch
• https://osv.dev/vulnerability/DEBIAN-CVE-2025-39912 · Vendor Advisory
• https://git.kernel.org/stable/c/57c1bb02b4fc8eec6eb01736e7fad26dffacf18c · Patch
• https://git.kernel.org/stable/c/992203a1fba51b025c60ec0c8b0d9223343dea95 · Patch
• https://bdu.fstec.ru/vul/2026-02756 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2025-39912 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2025-39912 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2025-39912 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-39912 · Security Note
• https://github.com/torvalds/linux/commit/57c1bb02b4fc8eec6eb01736e7fad26dffacf18c · Note