PT-2025-36311 · Linux+1 · Linux Kernel+1

Published 2025-08-08 · Updated 2025-09-06 · CVE-2025-39717

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description The Linux kernel contains a flaw in open tree attr that allows bypassing a restriction intended to prevent id-mapping changes without the OPEN TREE CLONE flag. This bypass was introduced by a bug in commit 2462651ffa76. While can idmap mount() prevented modification of id-mappings on attached mountpoints, it did not prevent changes on detached (but visible) mounts, potentially leading to use-after-free (UAF) and locking issues.

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

Exploit

Use After Free

Weakness Enumeration

CWE-456

CWE-453

CWE-416

Related Identifiers

BDU:2026-02858

CVE-2025-39717

Affected Products

Astra Linux

Linux Kernel

References · 17

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39717.json · Exploit
• https://bdu.fstec.ru/vul/2026-02858 · Security Note
• https://git.kernel.org/stable/c/69dbdc711d9130136824e3830191a6afffa0a1f0 · Patch
• https://security-tracker.debian.org/tracker/CVE-2025-39717 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-39717 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-39717 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2025-39717 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2025-39717 · Security Note
• https://osv.dev/vulnerability/CVE-2025-39717 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2025-39717 · Vendor Advisory
• https://git.kernel.org/stable/c/9308366f062129d52e0ee3f7a019f7dd41db33df · Patch
• https://t.me/CVEtracker/31805 · Telegram Post
• https://twitter.com/CVEnew/status/1964195439231848587 · Twitter Post
• https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git · Note
• https://lore.kernel.org/linux-cve-announce/2025090551-CVE-2025-39717-9e8a@gregkh · Note