PT-2025-40100 · Linux+2 · Linux Kernel+2

Published 2025-09-08 · Updated 2025-12-11 · CVE-2025-39926

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 genetlink functionality where the genl bind() function could invoke a bind callback even after permission checks failed, potentially allowing callbacks to run on behalf of unauthorized callers while the syscall still returned failure to user space. This issue stemmed from invoking the bind callback before verifying successful permission checks. The bind() callback was invoked even if capability checks failed and the return value was set to -EPERM.

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

Exploit

Weakness Enumeration

CWE-275

Related Identifiers

BDU:2026-02684

CVE-2025-39926

OPENSUSE-SU-2025:20081-1

SUSE-SU-2025:21074-1

SUSE-SU-2025:21139-1

SUSE-SU-2025:21179-1

Affected Products

Astra Linux

Linux Kernel

Suse

References · 1273

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39926.json · Exploit
• https://security-tracker.debian.org/tracker/CVE-2025-39926 · Vendor Advisory
• https://git.kernel.org/stable/c/8858c1e9405906c09589d7c336f04058ea198207 · Patch
• https://osv.dev/vulnerability/CVE-2025-39926 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-39926 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2025:21139-1 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2025-39926 · Security Note
• https://git.kernel.org/stable/c/98c9d884047a3051c203708914a874dece3cbe54 · Patch
• https://linux.oracle.com/errata/ELSA-2025-25754.html · Vendor Advisory
• https://git.kernel.org/stable/c/1dbfb0363224f6da56f6655d596dc5097308d6f5 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2025-39926 · Security Note
• https://osv.dev/vulnerability/BELL-CVE-2025-39926 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2025:20081-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2025:21074-1 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2025-39926 · Vendor Advisory