Answer in brief
CVE-2026-90391 records a Unknown severity vulnerability in lib/test_hmm: fail dmirror_fault() when the mirrored mm is gone. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=b2ef9f5a5cb37643ca5def3516c546457074b882 <50606ced303782f8715e2d0b98ca374ea498fa29 || >=b2ef9f5a5cb37643ca5def3516c546457074b882 <541a67f21ab807c8dbc0ea88d5a2eb73b2618090 || >=b2ef9f5a5cb37643ca5def3516c546457074b882 <d8e64ffab01e032ae29159d27230ace8cf8bdc80 || >=b2ef9f5a5cb37643ca5def3516c546457074b882 <2636569ea7c19d9a40db4a1e8d0a027bdacf1569 || >=b2ef9f5a5cb37643ca5def3516c546457074b882 <701347e31aa607f3782403151a3125729d685275 || >=b2ef9f5a5cb37643ca5def3516c546457074b882 <af7a6d6ec36a16a583ba2e4e9984c3cf1fe34655 || >=b2ef9f5a5cb37643ca5def3516c546457074b882 <a2074f86fc9653831e4fb7b711bb715db330f182 || >=b2ef9f5a5cb37643ca5def3516c546457074b882 <6a8024511ddf4877435c34fb3d6028aa8e590649 | 50606ced303782f8715e2d0b98ca374ea498fa29, 541a67f21ab807c8dbc0ea88d5a2eb73b2618090, d8e64ffab01e032ae29159d27230ace8cf8bdc80, 2636569ea7c19d9a40db4a1e8d0a027bdacf1569, 701347e31aa607f3782403151a3125729d685275, af7a6d6ec36a16a583ba2e4e9984c3cf1fe34655, a2074f86fc9653831e4fb7b711bb715db330f182, 6a8024511ddf4877435c34fb3d6028aa8e590649 |
| Linux/Linuxgeneric | 5.8 | Not reported |
Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 17, 2026
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.
Quoted source text, attributed separately from HOL analysis.