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.
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.
Metrics
Affected Vendors & Products
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Fixes
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
References
History
Wed, 01 Oct 2025 08:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | genetlink: fix genl_bind() invoking bind() after -EPERM | |
| References |
|
MITRE
Status: PUBLISHED
Assigner: Linux
Published:
Updated: 2025-10-01T08:07:13.883Z
Reserved: 2025-04-16T07:20:57.147Z
Link: CVE-2025-39926
Vulnrichment
No data.
NVD
Status : Received
Published: 2025-10-01T08:15:35.977
Modified: 2025-10-01T08:15:35.977
Link: CVE-2025-39926
Redhat
No data.
OpenCVE Enrichment
No data.