CVE-2026-90391 (GCVE-0-2026-90391)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:09 – Updated: 2026-09-17 16:09
VLAI
Title
lib/test_hmm: fail dmirror_fault() when the mirrored mm is gone
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b2ef9f5a5cb37643ca5def3516c546457074b882 , < 50606ced303782f8715e2d0b98ca374ea498fa29 (git)
Affected: b2ef9f5a5cb37643ca5def3516c546457074b882 , < 541a67f21ab807c8dbc0ea88d5a2eb73b2618090 (git)
Affected: b2ef9f5a5cb37643ca5def3516c546457074b882 , < d8e64ffab01e032ae29159d27230ace8cf8bdc80 (git)
Affected: b2ef9f5a5cb37643ca5def3516c546457074b882 , < 2636569ea7c19d9a40db4a1e8d0a027bdacf1569 (git)
Affected: b2ef9f5a5cb37643ca5def3516c546457074b882 , < 701347e31aa607f3782403151a3125729d685275 (git)
Affected: b2ef9f5a5cb37643ca5def3516c546457074b882 , < af7a6d6ec36a16a583ba2e4e9984c3cf1fe34655 (git)
Affected: b2ef9f5a5cb37643ca5def3516c546457074b882 , < a2074f86fc9653831e4fb7b711bb715db330f182 (git)
Affected: b2ef9f5a5cb37643ca5def3516c546457074b882 , < 6a8024511ddf4877435c34fb3d6028aa8e590649 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.8
Unaffected: 0 , < 5.8 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlib/test_hmm: fail dmirror_fault() when the mirrored mm is gone\n\ndmirror_fault() is called from the dmirror_read() and dmirror_write()\nretry loops after dmirror_do_read() or dmirror_do_write() finds a missing\ndevice page table entry.\n\nIf the mirrored mm has already exited, mmget_not_zero() fails.  The\ncurrent code returns 0 in that case, which tells the caller that faulting\nsucceeded even though no page was faulted and no device page table entry\nwas installed.  The caller then retries the same address, hits -ENOENT\nagain, and can loop forever without making progress.\n\nReturn -EFAULT instead, so the ioctl fails when the mirrored mm is no\nlonger faultable."
        }
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      "title": "lib/test_hmm: fail dmirror_fault() when the mirrored mm is gone",
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        "vulnStatus": "Received"
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      "current_release_date": "2026-09-22T16:29:01Z",
      "cve": "CVE-2026-90391",
      "id": "CVE-2026-90391",
      "initial_release_date": "2026-09-18T00:17:02Z",
      "product_status:known_affected": "230",
      "product_status:known_not_affected": "117",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-90391",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-90391.json",
      "version": "4"
    }
  }
}



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