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

Vulnerability from cvelistv5 – Published: 2026-06-08 15:41 – Updated: 2026-08-05 12:31
VLAI
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
References
Impacted 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)
Create a notification for this product.
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)
Create a notification for this product.
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              "value": "AV:L - Exploitation requires local syscalls to open the hmm_dmirror character device, issue HMM_DMIRROR_MIGRATE_TO_DEV ioctl, close the fd, and fault migrated pages; there is no network, adjacent-wireless, or physical-device attack path.\nAC:L - The UAF is deterministically triggered by the attacker\u0027s own migrate-then-close-then-fault sequence with no race or external timing dependency; the attacker fully controls both sides of the lifecycle.\nPR:L - The vulnerable ioctl and release paths perform no capability or permission checks beyond opening the local character device; any local user who can access /dev/hmm_dmirrorN can execute the full exploit chain without real root privileges in the init namespace.\nUI:N - No victim interaction is required; the attacker triggers the fault themselves by accessing their own migrated pages or aborting for coredump after closing the device file.\nS:U - Impact is confined to kernel memory corruption and panic within the same kernel security boundary; this is a test-module UAF, not a VM escape, IOMMU bypass, or cross-authority sandbox breakout.\nC:H - The stale dmirror pointer is dereferenced in dmirror_devmem_fault() to read freed kmalloc memory (dmirror-\u003emdevice, dmirror-\u003eflags), giving a classic UAF information-disclosure primitive.\nI:H - The fault handler continues to use the freed dmirror for migration and xa_erase on dmirror-\u003ept, enabling heap reuse attacks and arbitrary kernel memory write or code-execution primitives.\nA:H - The bug was reported to cause kernel panic during coredump VMA walks, and any UAF page fault on stale device-private pages can oops or panic the system."
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    "dateUpdated": "2026-08-05T12:31:01.052Z",
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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.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\nlib: test_hmm: expulsar p\u00e1ginas de dispositivo al cerrar el archivo para evitar el uso despu\u00e9s de liberaci\u00f3n\\n\\nSerie de parches \u0027Correcciones y limpiezas menores de hmm_test\u0027.\\n\\nDos correcciones de errores y una limpieza para las autopruebas del kernel HMM. Estos fueron reportados principalmente por Zenghui Yu con un agradecimiento especial a Lorenzo por analizar y se\u00f1alar los problemas.\\n\\nEste parche (de 3):\\n\\nCuando se llama a dmirror_fops_release(), libera la estructura dmirror pero no migra primero las p\u00e1ginas privadas del dispositivo de vuelta a la memoria del sistema. Esto deja esas p\u00e1ginas con un puntero zone_device_data colgante a la dmirror liberada.\\n\\nSi ocurre una falla posterior en esas p\u00e1ginas (por ejemplo, durante un coredump), la devoluci\u00f3n de llamada dmirror_devmem_fault() desreferencia el puntero obsoleto causando un p\u00e1nico del kernel. Esto fue reportado [1] al ejecutar mm/ksft_hmm.sh en arm64, donde una falla de prueba activ\u00f3 SIGABRT y el coredump resultante recorri\u00f3 las VMA causando fallas en las p\u00e1ginas privadas de dispositivo obsoletas.\\n\\nSolucione esto llamando a dmirror_device_evict_chunk() para cada fragmento de devmem en dmirror_fops_release() para migrar todas las p\u00e1ginas privadas del dispositivo de vuelta a la memoria del sistema antes de liberar la estructura dmirror. La funci\u00f3n se mueve antes en el archivo para evitar una declaraci\u00f3n anticipada.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"lib/test_hmm.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"b2ef9f5a5cb37643ca5def3516c546457074b882\",\"lessThan\":\"234071b4318feaeb27cd2e4e1b16ef6b055adf89\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b2ef9f5a5cb37643ca5def3516c546457074b882\",\"lessThan\":\"bf477abd448c76bb8ea51c9b4f63a3a17c4b6239\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b2ef9f5a5cb37643ca5def3516c546457074b882\",\"lessThan\":\"5846715b6382dd4c6a69b35a56ca6115d33bc2a0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b2ef9f5a5cb37643ca5def3516c546457074b882\",\"lessThan\":\"38f113f81d3f0adc658a4475dd3ecaec985e21d3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b2ef9f5a5cb37643ca5def3516c546457074b882\",\"lessThan\":\"9de1eb0aac2862d6144b8db0ec1388e79f8bc3e1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b2ef9f5a5cb37643ca5def3516c546457074b882\",\"lessThan\":\"744dd97752ef1076a8d8672bb0d8aa2c7abc1144\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"lib/test_hmm.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.8\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.8\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.176\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.140\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.86\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.27\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.4\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.8\",\"versionEndExcluding\":\"6.1.176\",\"matchCriteriaId\":\"3119E417-9FF5-4E06-9321-6696E979BECA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.140\",\"matchCriteriaId\":\"A1A92866-F406-43B5-B2D1-CFC274753E9D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.86\",\"matchCriteriaId\":\"55DA1C62-9991-451E-B8A8-E0004E00F789\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.27\",\"matchCriteriaId\":\"A10AC84F-C058-47D5-85B4-E6E51A613B74\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"7.0.4\",\"matchCriteriaId\":\"CDB78D6D-22C3-4154-B0D0-94AF1CE5C2E3\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/234071b4318feaeb27cd2e4e1b16ef6b055adf89\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/38f113f81d3f0adc658a4475dd3ecaec985e21d3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5846715b6382dd4c6a69b35a56ca6115d33bc2a0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/744dd97752ef1076a8d8672bb0d8aa2c7abc1144\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/9de1eb0aac2862d6144b8db0ec1388e79f8bc3e1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-05T14:45:44+00:00",
      "cve": "CVE-2026-46280",
      "id": "CVE-2026-46280",
      "initial_release_date": "2026-06-08T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: lib: test_hmm: evict device pages on file close to avoid use-after-free",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46280.json",
      "version": "3"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.