CVE-2026-90391
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Vulnerability report for CVE-2026-90391, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-09-17
Last updated on: 2026-09-17
Assigner: kernel.org
Description
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.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
Currently, no data is known.
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-UNKNOWN |
