CVE-2025-39926
MEDIUM EPSS 3.3%
Published Oct 1, 20259mo ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Published Oct 1, 2025 9mo ago
Last Modified Jun 17, 2026 2w ago
Description
In the Linux kernel, the following vulnerability has been resolved: genetlink: fix genl_bind() invoking bind() after -EPERM Per family bind/unbind callbacks were introduced to allow families to track multicast group consumer presence, e.g. to start or stop producing events depending on listeners. However, in genl_bind() the bind() callback was invoked even if capability checks failed and ret was set to -EPERM. This means that callbacks could run on behalf of unauthorized callers while the syscall still returned failure to user space. Fix this by only invoking bind() after "if (ret) break;" check i.e. after permission checks have succeeded.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High
Threat Intelligence
EPSS Exploit Probability
3.3% percentile
Exploit & Patch Status
No Known Exploit
Patch Available
Affected Products 7
References 3
- git.kernel.org https://git.kernel.org/stable/c/1dbfb0363224f6da56f6655d596dc5097308d6f5
- git.kernel.org https://git.kernel.org/stable/c/8858c1e9405906c09589d7c336f04058ea198207
- git.kernel.org https://git.kernel.org/stable/c/98c9d884047a3051c203708914a874dece3cbe54
Remediation
- git.kernel.org https://git.kernel.org/stable/c/1dbfb0363224f6da56f6655d596dc5097308d6f5
- git.kernel.org https://git.kernel.org/stable/c/8858c1e9405906c09589d7c336f04058ea198207
- git.kernel.org https://git.kernel.org/stable/c/98c9d884047a3051c203708914a874dece3cbe54