CVE-2024-35791 (GCVE-0-2024-35791)
Vulnerability from cvelistv5
Published
2024-05-17 12:24
Modified
2026-08-05 11:29
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
Impacted products
Vendor Product Version
Linux Linux Version: 4f627ecde7329e476a077bb0590db8f27bb8f912
Version: 19a23da53932bc8011220bd8c410cb76012de004
Version: 19a23da53932bc8011220bd8c410cb76012de004
Version: 19a23da53932bc8011220bd8c410cb76012de004
Version: 19a23da53932bc8011220bd8c410cb76012de004
Version: 19a23da53932bc8011220bd8c410cb76012de004
Version: f1ecde00ce1694597f923f0d25f7a797c5243d99
Version: 848bcb0a1d96f67d075465667d3a1ad4af56311e
Version: 5.10.15   ≤
Version: 4.19.176   ≤
Version: 5.4.98   ≤
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\"https://git.kernel.org/stable/c/e126b508ed2e616d679d85fca2fbe77bb48bbdd7\"}, {\"url\": \"https://git.kernel.org/stable/c/4868c0ecdb6cfde7c70cf478c46e06bb9c7e5865\"}, {\"url\": \"https://git.kernel.org/stable/c/12f8e32a5a389a5d58afc67728c76e61beee1ad4\"}, {\"url\": \"https://git.kernel.org/stable/c/f6d53d8a2617dd58c89171a6b9610c470ebda38a\"}, {\"url\": \"https://git.kernel.org/stable/c/5ef1d8c1ddbf696e47b226e11888eaf8d9e8e807\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.215\", \"versionStartIncluding\": \"5.10.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.154\", \"versionStartIncluding\": \"5.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.84\", \"versionStartIncluding\": \"5.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.24\", \"versionStartIncluding\": \"5.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.7.12\", \"versionStartIncluding\": \"5.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8\", \"versionStartIncluding\": \"5.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.19.176\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.4.98\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:29:57.222Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-35791\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:29:57.222Z\", \"dateReserved\": \"2024-05-17T12:19:12.339Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-17T12:24:49.520Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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