CVE-2026-90391

Summary

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

VendorProductVersion RangeStatus
LinuxLinuxb2ef9f5a5cb37643ca5def3516c546457074b882 < 50606ced303782f8715e2d0b98ca374ea498fa29affected
LinuxLinuxb2ef9f5a5cb37643ca5def3516c546457074b882 < 541a67f21ab807c8dbc0ea88d5a2eb73b2618090affected
LinuxLinuxb2ef9f5a5cb37643ca5def3516c546457074b882 < d8e64ffab01e032ae29159d27230ace8cf8bdc80affected
LinuxLinuxb2ef9f5a5cb37643ca5def3516c546457074b882 < 2636569ea7c19d9a40db4a1e8d0a027bdacf1569affected
LinuxLinuxb2ef9f5a5cb37643ca5def3516c546457074b882 < 701347e31aa607f3782403151a3125729d685275affected
LinuxLinuxb2ef9f5a5cb37643ca5def3516c546457074b882 < af7a6d6ec36a16a583ba2e4e9984c3cf1fe34655affected
LinuxLinuxb2ef9f5a5cb37643ca5def3516c546457074b882 < a2074f86fc9653831e4fb7b711bb715db330f182affected
LinuxLinuxb2ef9f5a5cb37643ca5def3516c546457074b882 < 6a8024511ddf4877435c34fb3d6028aa8e590649affected
LinuxLinux5.8affected
LinuxLinux0 < 5.8unaffected
LinuxLinux5.10.270 <= 5.10.*unaffected
LinuxLinux5.15.221 <= 5.15.*unaffected
LinuxLinux6.1.188 <= 6.1.*unaffected
LinuxLinux6.6.157 <= 6.6.*unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.52 <= 6.18.*unaffected
LinuxLinux7.2.6 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References