FKIE_CVE-2024-35791

Vulnerability from fkie_nvd - Published: 2024-05-17 13:15 - Updated: 2025-12-23 18:45
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: Flush pages under kvm->lock to fix UAF in svm_register_enc_region() Do the cache flush of converted pages in svm_register_enc_region() before dropping kvm->lock to fix use-after-free issues where region and/or its array of pages could be freed by a different task, e.g. if userspace has __unregister_enc_region_locked() already queued up for the region. Note, the "obvious" alternative of using local variables doesn't fully resolve the bug, as region->pages is also dynamically allocated. I.e. the region structure itself would be fine, but region->pages could be freed. Flushing multiple pages under kvm->lock is unfortunate, but the entire flow is a rare slow path, and the manual flush is only needed on CPUs that lack coherency for encrypted memory.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/12f8e32a5a389a5d58afc67728c76e61beee1ad4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2d13b79640b147bd77c34a5998533b2021a4122dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4868c0ecdb6cfde7c70cf478c46e06bb9c7e5865Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5ef1d8c1ddbf696e47b226e11888eaf8d9e8e807Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e126b508ed2e616d679d85fca2fbe77bb48bbdd7Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f6d53d8a2617dd58c89171a6b9610c470ebda38aPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/12f8e32a5a389a5d58afc67728c76e61beee1ad4Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/2d13b79640b147bd77c34a5998533b2021a4122dPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/4868c0ecdb6cfde7c70cf478c46e06bb9c7e5865Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/5ef1d8c1ddbf696e47b226e11888eaf8d9e8e807Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e126b508ed2e616d679d85fca2fbe77bb48bbdd7Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/f6d53d8a2617dd58c89171a6b9610c470ebda38aPatch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/06/msg00017.htmlThird Party Advisory
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.11
linux linux_kernel 5.11
linux linux_kernel 6.8
linux linux_kernel 6.8
linux linux_kernel 6.8
linux linux_kernel 6.8
linux linux_kernel 6.8
linux linux_kernel 6.8
linux linux_kernel 6.8
debian debian_linux 10.0
To clipboard 

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    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SVM: Flush pages under kvm-\u003elock to fix UAF in svm_register_enc_region()\n\nDo the cache flush of converted pages in svm_register_enc_region() before\ndropping kvm-\u003elock to fix use-after-free issues where region and/or its\narray of pages could be freed by a different task, e.g. if userspace has\n__unregister_enc_region_locked() already queued up for the region.\n\nNote, the \"obvious\" alternative of using local variables doesn\u0027t fully\nresolve the bug, as region-\u003epages is also dynamically allocated.  I.e. the\nregion structure itself would be fine, but region-\u003epages could be freed.\n\nFlushing multiple pages under kvm-\u003elock is unfortunate, but the entire\nflow is a rare slow path, and the manual flush is only needed on CPUs that\nlack coherency for encrypted memory."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: KVM: SVM: Vaciar p\u00e1ginas bajo kvm-\u0026gt;lock para arreglar UAF en svm_register_enc_region() Realice el vaciado de cach\u00e9 de las p\u00e1ginas convertidas en svm_register_enc_region() antes de eliminar kvm-\u0026gt;lock para arreglar el uso -Problemas posteriores a la liberaci\u00f3n en los que la regi\u00f3n y/o su conjunto de p\u00e1ginas podr\u00edan liberarse mediante una tarea diferente, por ejemplo, si el espacio de usuario ya tiene __unregister_enc_region_locked() en cola para la regi\u00f3n. Tenga en cuenta que la alternativa \"obvia\" de usar variables locales no resuelve completamente el error, ya que regi\u00f3n-\u0026gt;p\u00e1ginas tambi\u00e9n se asigna din\u00e1micamente. Es decir, la estructura de la regi\u00f3n en s\u00ed estar\u00eda bien, pero se podr\u00edan liberar regiones-\u0026gt;p\u00e1ginas. Vaciar varias p\u00e1ginas bajo kvm-\u0026gt;lock es desafortunado, pero todo el flujo es un camino lento poco com\u00fan, y el vaciado manual solo es necesario en CPU que carecen de coherencia para la memoria cifrada."
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  "id": "CVE-2024-35791",
  "lastModified": "2025-12-23T18:45:58.890",
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          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
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          "userInteraction": "NONE",
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  • 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.
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  • 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.



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