Vulnerability-Lookup

GHSA-VJJG-R28Q-G2G4

Vulnerability from github – Published: 2026-06-08 18:31 – Updated: 2026-06-19 15:33

Details

In the Linux kernel, the following vulnerability has been resolved:

lib: test_hmm: evict device pages on file close to avoid use-after-free

Patch series "Minor hmm_test fixes and cleanups".

Two bugfixes a cleanup for the HMM kernel selftests. These were mostly reported by Zenghui Yu with special thanks to Lorenzo for analysing and pointing out the problems.

This patch (of 3):

When dmirror_fops_release() is called it frees the dmirror struct but doesn't migrate device private pages back to system memory first. This leaves those pages with a dangling zone_device_data pointer to the freed dmirror.

If a subsequent fault occurs on those pages (eg. during coredump) the dmirror_devmem_fault() callback dereferences the stale pointer causing a kernel panic. This was reported [1] when running mm/ksft_hmm.sh on arm64, where a test failure triggered SIGABRT and the resulting coredump walked the VMAs faulting in the stale device private pages.

Fix this by calling dmirror_device_evict_chunk() for each devmem chunk in dmirror_fops_release() to migrate all device private pages back to system memory before freeing the dmirror struct. The function is moved earlier in the file to avoid a forward declaration.

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-46280"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-08T17:16:45Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nlib: test_hmm: evict device pages on file close to avoid use-after-free\n\nPatch series \"Minor hmm_test fixes and cleanups\".\n\nTwo bugfixes a cleanup for the HMM kernel selftests.  These were mostly\nreported by Zenghui Yu with special thanks to Lorenzo for analysing and\npointing out the problems.\n\n\nThis patch (of 3):\n\nWhen dmirror_fops_release() is called it frees the dmirror struct but\ndoesn\u0027t migrate device private pages back to system memory first.  This\nleaves those pages with a dangling zone_device_data pointer to the freed\ndmirror.\n\nIf a subsequent fault occurs on those pages (eg.  during coredump) the\ndmirror_devmem_fault() callback dereferences the stale pointer causing a\nkernel panic.  This was reported [1] when running mm/ksft_hmm.sh on arm64,\nwhere a test failure triggered SIGABRT and the resulting coredump walked\nthe VMAs faulting in the stale device private pages.\n\nFix this by calling dmirror_device_evict_chunk() for each devmem chunk in\ndmirror_fops_release() to migrate all device private pages back to system\nmemory before freeing the dmirror struct.  The function is moved earlier\nin the file to avoid a forward declaration.",
  "id": "GHSA-vjjg-r28q-g2g4",
  "modified": "2026-06-19T15:33:14Z",
  "published": "2026-06-08T18:31:51Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46280"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/234071b4318feaeb27cd2e4e1b16ef6b055adf89"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/38f113f81d3f0adc658a4475dd3ecaec985e21d3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5846715b6382dd4c6a69b35a56ca6115d33bc2a0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/744dd97752ef1076a8d8672bb0d8aa2c7abc1144"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9de1eb0aac2862d6144b8db0ec1388e79f8bc3e1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bf477abd448c76bb8ea51c9b4f63a3a17c4b6239"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-46280 (GCVE-0-2026-46280)

Vulnerability from cvelistv5 – Published: 2026-06-08 15:41 – Updated: 2026-06-19 12:00

Title

lib: test_hmm: evict device pages on file close to avoid use-after-free

Summary

In the Linux kernel, the following vulnerability has been resolved: lib: test_hmm: evict device pages on file close to avoid use-after-free Patch series "Minor hmm_test fixes and cleanups". Two bugfixes a cleanup for the HMM kernel selftests. These were mostly reported by Zenghui Yu with special thanks to Lorenzo for analysing and pointing out the problems. This patch (of 3): When dmirror_fops_release() is called it frees the dmirror struct but doesn't migrate device private pages back to system memory first. This leaves those pages with a dangling zone_device_data pointer to the freed dmirror. If a subsequent fault occurs on those pages (eg. during coredump) the dmirror_devmem_fault() callback dereferences the stale pointer causing a kernel panic. This was reported [1] when running mm/ksft_hmm.sh on arm64, where a test failure triggered SIGABRT and the resulting coredump walked the VMAs faulting in the stale device private pages. Fix this by calling dmirror_device_evict_chunk() for each devmem chunk in dmirror_fops_release() to migrate all device private pages back to system memory before freeing the dmirror struct. The function is moved earlier in the file to avoid a forward declaration.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux

References

6 references

URL	Tags
https://git.kernel.org/stable/c/234071b4318feaeb2…
https://git.kernel.org/stable/c/bf477abd448c76bb8…
https://git.kernel.org/stable/c/5846715b6382dd4c6…
https://git.kernel.org/stable/c/38f113f81d3f0adc6…
https://git.kernel.org/stable/c/9de1eb0aac2862d61…
https://git.kernel.org/stable/c/744dd97752ef1076a…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: b2ef9f5a5cb37643ca5def3516c546457074b882 , < 234071b4318feaeb27cd2e4e1b16ef6b055adf89 (git) Affected: b2ef9f5a5cb37643ca5def3516c546457074b882 , < bf477abd448c76bb8ea51c9b4f63a3a17c4b6239 (git) Affected: b2ef9f5a5cb37643ca5def3516c546457074b882 , < 5846715b6382dd4c6a69b35a56ca6115d33bc2a0 (git) Affected: b2ef9f5a5cb37643ca5def3516c546457074b882 , < 38f113f81d3f0adc658a4475dd3ecaec985e21d3 (git) Affected: b2ef9f5a5cb37643ca5def3516c546457074b882 , < 9de1eb0aac2862d6144b8db0ec1388e79f8bc3e1 (git) Affected: b2ef9f5a5cb37643ca5def3516c546457074b882 , < 744dd97752ef1076a8d8672bb0d8aa2c7abc1144 (git)
Linux	Linux	Affected: 5.8 Unaffected: 0 , < 5.8 (semver) Unaffected: 6.1.176 , ≤ 6.1.* (semver) Unaffected: 6.6.140 , ≤ 6.6.* (semver) Unaffected: 6.12.86 , ≤ 6.12.* (semver) Unaffected: 6.18.27 , ≤ 6.18.* (semver) Unaffected: 7.0.4 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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          "programFiles": [
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              "version": "6.12.86",
              "versionType": "semver"
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              "version": "7.0.4",
              "versionType": "semver"
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    "datePublished": "2026-06-08T15:41:23.095Z",
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

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GHSA-VJJG-R28Q-G2G4

CVE-2026-46280 (GCVE-0-2026-46280)

Tags

Sightings

Nomenclature