CVE-2026-64258

Summary

In the Linux kernel, the following vulnerability has been resolved:

fuse-uring: remove request-less entries from ent_w_req_queue to fix NULL deref

If a copy into the userspace ring buffer fails, a request will be terminated and fuse_uring_req_end() will set ent->fuse_req to NULL but it will leave the entry on ent_w_req_queue in FRRS_FUSE_REQ state. This can lead to a NULL deref if the request expiration logic scans ent_w_req_queue in the window before the entry is moved off it.

Fix this by taking the entry off ent_w_req_queue and changing its state from FRRS_FUSE_REQ to FRRS_INVALID before terminating the request.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux4fea593e625cd50d4d11be227007849b12f17bfb < 0b466cf1b96e191b06b496c4de79da15315c3a9aaffected
LinuxLinux4fea593e625cd50d4d11be227007849b12f17bfb < 0a7f33010c0e4cd92937e088a54350381fd0fbf2affected
LinuxLinux4fea593e625cd50d4d11be227007849b12f17bfb < 1c57a69be962d459c5e705f5cb4355b841b3461caffected
LinuxLinux6.16affected
LinuxLinux0 < 6.16unaffected
LinuxLinux6.18.39 <= 6.18.*unaffected
LinuxLinux7.1.4 <= 7.1.*unaffected
LinuxLinux7.2-rc1 <= *unaffected

Weaknesses

References