Detections
Analytics
CVE-2026-90391
medium
Description
In the Linux kernel, the following vulnerability has been resolved: lib/test_hmm: fail dmirror_fault() when the mirrored mm is gone dmirror_fault() is called from the dmirror_read() and dmirror_write() retry loops after dmirror_do_read() or dmirror_do_write() finds a missing device page table entry. If the mirrored mm has already exited, mmget_not_zero() fails. The current code returns 0 in that case, which tells the caller that faulting succeeded even though no page was faulted and no device page table entry was installed. The caller then retries the same address, hits -ENOENT again, and can loop forever without making progress. Return -EFAULT instead, so the ioctl fails when the mirrored mm is no longer faultable.
References
https://git.kernel.org/stable/c/d8e64ffab01e032ae29159d27230ace8cf8bdc80
https://git.kernel.org/stable/c/af7a6d6ec36a16a583ba2e4e9984c3cf1fe34655
https://git.kernel.org/stable/c/a2074f86fc9653831e4fb7b711bb715db330f182
https://git.kernel.org/stable/c/701347e31aa607f3782403151a3125729d685275
https://git.kernel.org/stable/c/6a8024511ddf4877435c34fb3d6028aa8e590649
https://git.kernel.org/stable/c/541a67f21ab807c8dbc0ea88d5a2eb73b2618090
https://git.kernel.org/stable/c/50606ced303782f8715e2d0b98ca374ea498fa29
https://git.kernel.org/stable/c/2636569ea7c19d9a40db4a1e8d0a027bdacf1569