Vulnerability 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/2636569ea7c19d9a40db4a1e8d0a027bdacf1569
- https://git.kernel.org/stable/c/50606ced303782f8715e2d0b98ca374ea498fa29
- https://git.kernel.org/stable/c/541a67f21ab807c8dbc0ea88d5a2eb73b2618090
- https://git.kernel.org/stable/c/6a8024511ddf4877435c34fb3d6028aa8e590649
- https://git.kernel.org/stable/c/701347e31aa607f3782403151a3125729d685275
- https://git.kernel.org/stable/c/a2074f86fc9653831e4fb7b711bb715db330f182
- https://git.kernel.org/stable/c/af7a6d6ec36a16a583ba2e4e9984c3cf1fe34655
- https://git.kernel.org/stable/c/d8e64ffab01e032ae29159d27230ace8cf8bdc80
FAQ
What is CVE-2026-90391?
CVE-2026-90391 is a documented vulnerability. 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_writ...
How severe is CVE-2026-90391?
CVSS scoring is not yet available for CVE-2026-90391. Check NVD for updates.
Is there a patch for CVE-2026-90391?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.