CVE-2026-90391

lib/test_hmm: fail dmirror_fault() when the mirrored mm is gone

State: Published
Severity: Not scored
Published: Sep 17, 2026
Updated: Oct 19, 2026
Reserved: Sep 11, 2026

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	b2ef9f5a5cb37643ca5def3516c546457074b882 to before 50606ced303782f8715e2d0b98ca374ea498fa29Affected b2ef9f5a5cb37643ca5def3516c546457074b882 to before 541a67f21ab807c8dbc0ea88d5a2eb73b2618090Affected b2ef9f5a5cb37643ca5def3516c546457074b882 to before d8e64ffab01e032ae29159d27230ace8cf8bdc80Affected b2ef9f5a5cb37643ca5def3516c546457074b882 to before 2636569ea7c19d9a40db4a1e8d0a027bdacf1569Affected b2ef9f5a5cb37643ca5def3516c546457074b882 to before 701347e31aa607f3782403151a3125729d685275Affected b2ef9f5a5cb37643ca5def3516c546457074b882 to before af7a6d6ec36a16a583ba2e4e9984c3cf1fe34655Affected b2ef9f5a5cb37643ca5def3516c546457074b882 to before a2074f86fc9653831e4fb7b711bb715db330f182Affected b2ef9f5a5cb37643ca5def3516c546457074b882 to before 6a8024511ddf4877435c34fb3d6028aa8e590649Affected
LinuxLinux	5.8Affected before 5.8Not affected 5.10.270 through 5.10.Not affected 5.15.221 through 5.15.Not affected 6.1.188 through 6.1.Not affected 6.6.157 through 6.6.Not affected 6.12.110 through 6.12.Not affected 6.18.52 through 6.18.Not affected 7.2.6 through 7.2.*Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

b2ef9f5a5cb37643ca5def3516c546457074b882 to before 50606ced303782f8715e2d0b98ca374ea498fa29Affected
b2ef9f5a5cb37643ca5def3516c546457074b882 to before 541a67f21ab807c8dbc0ea88d5a2eb73b2618090Affected
b2ef9f5a5cb37643ca5def3516c546457074b882 to before d8e64ffab01e032ae29159d27230ace8cf8bdc80Affected
b2ef9f5a5cb37643ca5def3516c546457074b882 to before 2636569ea7c19d9a40db4a1e8d0a027bdacf1569Affected
b2ef9f5a5cb37643ca5def3516c546457074b882 to before 701347e31aa607f3782403151a3125729d685275Affected
b2ef9f5a5cb37643ca5def3516c546457074b882 to before af7a6d6ec36a16a583ba2e4e9984c3cf1fe34655Affected
b2ef9f5a5cb37643ca5def3516c546457074b882 to before a2074f86fc9653831e4fb7b711bb715db330f182Affected
b2ef9f5a5cb37643ca5def3516c546457074b882 to before 6a8024511ddf4877435c34fb3d6028aa8e590649Affected

LinuxLinux

5.8Affected
before 5.8Not affected
5.10.270 through 5.10.*Not affected
5.15.221 through 5.15.*Not affected
6.1.188 through 6.1.*Not affected
6.6.157 through 6.6.*Not affected
6.12.110 through 6.12.*Not affected
6.18.52 through 6.18.*Not affected
7.2.6 through 7.2.*Not affected
7.3 and laterNot affected

References

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