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CVE-2026-90391

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Last modified

CVE-2026-90391 is a vulnerability of currently unknown severity. 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.

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.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= b2ef9f5a5cb37643ca5def3516c546457074b882, < 50606ced303782f8715e2d0b98ca374ea498fa29; >= b2ef9f5a5cb37643ca5def3516c546457074b882, < 541a67f21ab807c8dbc0ea88d5a2eb73b2618090; >= b2ef9f5a5cb37643ca5def3516c546457074b882, < d8e64ffab01e032ae29159d27230ace8cf8bdc80; >= b2ef9f5a5cb37643ca5def3516c546457074b882, < 2636569ea7c19d9a40db4a1e8d0a027bdacf1569; >= b2ef9f5a5cb37643ca5def3516c546457074b882, < 701347e31aa607f3782403151a3125729d685275; >= b2ef9f5a5cb37643ca5def3516c546457074b882, < af7a6d6ec36a16a583ba2e4e9984c3cf1fe34655; >= b2ef9f5a5cb37643ca5def3516c546457074b882, < a2074f86fc9653831e4fb7b711bb715db330f182; >= b2ef9f5a5cb37643ca5def3516c546457074b882, < 6a8024511ddf4877435c34fb3d6028aa8e590649
LinuxLinux5.8

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-90391?
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.
How severe is CVE-2026-90391?
Severity scoring for CVE-2026-90391 is pending analysis.
How do I fix CVE-2026-90391?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST