What happened
In the Linux kernel, the following vulnerability has been resolved: SUNRPC: lock against ->sock changing during sysfs read ->sock can be set to NULL asynchronously unless ->recv_mutex is held. So it is important to hold that mutex. Otherwise a sysfs read can trigger an oops. Commit 17f09d3f619a ("SUNRPC: Check if the xprt is connected before handling sysfs reads") appears to attempt to fix this problem, but it only narrows the race window.
Affected versions
Linux: 21a2be1a5145d072deedc7cdc5b2d17380abea75 through before cd366b9091a3e6ed8229e4b908e895d20b527dc0 (git); a8482488a7d6d320f63a9ee1912dbb5ae5b80a61 through before fdc42287ae3f8a35cc2098307f52d7864b4bc8ed (git); a8482488a7d6d320f63a9ee1912dbb5ae5b80a61 through before 9482ab4540f5bcc869b44c067ae99b5fca16bd07 (git); a8482488a7d6d320f63a9ee1912dbb5ae5b80a61 through before b49ea673e119f59c71645e2f65b3ccad857c90ee (git); 77876473912d1bf1ed16bffa1674e5ff0f499f25 (git); 5.10.67 through before 5.10.271 (semver); 5.13.19 through before 5.14 (semver); 5.14 Fixed: See vendor advisory.
Why it matters
Review the vendor advisory and exposure of the affected product to determine operational impact.
Detection & mitigation
- Apply vendor-provided updates or mitigations.
- Review affected product exposure and access logs.
Public PoC references
No public PoC reference has passed the current publication threshold.