CVE-2026-80857

Summary

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

fuse: wait for FR_FINISHED on abort_on_kill to prevent use-after-free

The abort_on_kill path in request_wait_answer() calls fuse_abort_conn() and returns without waiting for FR_FINISHED. If fuse_dev_do_write() is concurrently processing the same request (FR_LOCKED set), the caller frees req->args while it is still being accessed, causing a use-after-free.

Fix this by jumping to the existing wait_event(FR_FINISHED) instead of returning early. The wait will not hang because fuse_abort_conn() ensures all requests are ended.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux204aa22a686bfee48daca7db620c1e017615f2ff < 715cb86e33cda43f5224cdc3fd5610c0b6a46f7aaffected
LinuxLinux204aa22a686bfee48daca7db620c1e017615f2ff < 64b0b5cacbd2fea88001464cb712c9dfc795b26eaffected
LinuxLinux0c7fca880a40a209a9c92be14143996d14b93ff6affected
LinuxLinux300e812b882a174dca675d8028684001ad5826bcaffected
LinuxLinux6.18.25 < 6.19affected
LinuxLinux7.0.2 < 7.1affected
LinuxLinux7.1affected
LinuxLinux0 < 7.1unaffected
LinuxLinux7.2.3 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References