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

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-90391

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-90391

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "b2ef9f5a5cb37643ca5def3516c546457074b882",
        "lessThan": "50606ced303782f8715e2d0b98ca374ea498fa29",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b2ef9f5a5cb37643ca5def3516c546457074b882",
        "lessThan": "541a67f21ab807c8dbc0ea88d5a2eb73b2618090",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b2ef9f5a5cb37643ca5def3516c546457074b882",
        "lessThan": "d8e64ffab01e032ae29159d27230ace8cf8bdc80",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b2ef9f5a5cb37643ca5def3516c546457074b882",
        "lessThan": "2636569ea7c19d9a40db4a1e8d0a027bdacf1569",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b2ef9f5a5cb37643ca5def3516c546457074b882",
        "lessThan": "701347e31aa607f3782403151a3125729d685275",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b2ef9f5a5cb37643ca5def3516c546457074b882",
        "lessThan": "af7a6d6ec36a16a583ba2e4e9984c3cf1fe34655",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b2ef9f5a5cb37643ca5def3516c546457074b882",
        "lessThan": "a2074f86fc9653831e4fb7b711bb715db330f182",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b2ef9f5a5cb37643ca5def3516c546457074b882",
        "lessThan": "6a8024511ddf4877435c34fb3d6028aa8e590649",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "lib/test_hmm.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.8"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.8",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.52",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "lib/test_hmm.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-90391

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#36716 · Revision 1
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Publisher date
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