CVE-2025-39926
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-10-01

Last updated on: 2025-12-11

Assigner: kernel.org

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.
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Meta Information
Published
2025-10-01
Last Modified
2025-12-11
Generated
2026-06-16
AI Q&A
2025-10-01
EPSS Evaluated
2026-06-14
NVD
CVE-2025-39926
Affected Vendors & Products
Showing 7 associated CPEs
Vendor Product Version / Range
linux linux_kernel From 6.9 (inc) to 6.12.48 (exc)
linux linux_kernel From 6.13 (inc) to 6.16.8 (exc)
linux linux_kernel 6.17
linux linux_kernel 6.17
linux linux_kernel 6.17
linux linux_kernel 6.17
linux linux_kernel 6.17
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Exploitability
CWE
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CWE ID Description
CWE-NVD-CWE-noinfo
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Executive Summary

This vulnerability in the Linux kernel involves the genetlink subsystem where the genl_bind() function incorrectly invoked the bind() callback even when permission checks failed (specifically when returning -EPERM). This meant that unauthorized callers could trigger callbacks despite the syscall failing, potentially allowing actions to be performed on their behalf without proper authorization. The fix ensures that the bind() callback is only invoked after successful permission checks.

Impact Analysis

The vulnerability could allow unauthorized users to cause callbacks to run on their behalf, potentially leading to unauthorized actions or information disclosure within the kernel's genetlink subsystem. Although the syscall returns a failure to user space, the unauthorized invocation of callbacks could be exploited to affect system behavior or security.

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