CVE-2024-36910 (GCVE-0-2024-36910)
Vulnerability from cvelistv5
Published
2024-05-30 15:29
Modified
2026-08-05 11:31
Severity ?
8.4 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: uio_hv_generic: Don't free decrypted memory In CoCo VMs it is possible for the untrusted host to cause set_memory_encrypted() or set_memory_decrypted() to fail such that an error is returned and the resulting memory is shared. Callers need to take care to handle these errors to avoid returning decrypted (shared) memory to the page allocator, which could lead to functional or security issues. The VMBus device UIO driver could free decrypted/shared pages if set_memory_decrypted() fails. Check the decrypted field in the gpadl to decide whether to free the memory.
References
Impacted products
Vendor Product Version
Linux Linux Version: d4dccf353db80e209f262e3973c834e6e48ba9a9
Version: d4dccf353db80e209f262e3973c834e6e48ba9a9
Version: d4dccf353db80e209f262e3973c834e6e48ba9a9
Version: d4dccf353db80e209f262e3973c834e6e48ba9a9
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This is a local, non-network attack channel against the guest kernel.\\nAC:L - The host deterministically controls both the GPADL creation status and the outcome of the host-visibility hypercalls backing set_memory_decrypted()/set_memory_encrypted(), and can additionally force the teardown path at will by rescinding the channel, so the failing free of shared memory is reliably reproducible and repeatable.\\nPR:N - Privileges are measured against the vulnerable component \\u2014 the guest kernel \\u2014 and a malicious host holds no credentials or account inside the guest; it needs no guest-side privilege to drive the VMBus failure paths.\\nUI:N - No guest user action is needed: the host triggers the probe failure path or forces channel rescind/teardown on its own schedule once the driver is bound at boot.\\nS:U - The vulnerable component and the impacted resources are both the guest Linux kernel and its memory; there is no guest-to-host escape or other crossing into a different security authority.\\nC:H - Up to 47 MB of still-host-shared pages are returned to the guest page allocator and subsequently reused for arbitrary kernel and user allocations, letting the untrusted host read guest secrets, keys and kernel data \\u2014 a total break of the confidential VM\u0027s confidentiality guarantee.\\nI:H - The same reallocated pages remain writable by the host, giving an arbitrary write primitive into live guest kernel structures (page tables, credentials, code paths\u0027 data), which is sufficient for full guest kernel compromise.\\nA:H - Encryption-state mismatch on the recycled pages leads to corrupted data and faults when the guest accesses them as private memory, and host-controlled writes into arbitrary reallocated kernel memory readily produce a guest kernel panic.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"d4dccf353db80e209f262e3973c834e6e48ba9a9\", \"lessThan\": \"dabf12bf994318d939f70d47cfda30e47abb2c54\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d4dccf353db80e209f262e3973c834e6e48ba9a9\", \"lessThan\": \"6466a0f6d235c8a18c602cb587160d7e49876db9\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d4dccf353db80e209f262e3973c834e6e48ba9a9\", \"lessThan\": \"fe2c58602354fbd60680dc42ac3a0b772cda7d23\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d4dccf353db80e209f262e3973c834e6e48ba9a9\", \"lessThan\": \"3d788b2fbe6a1a1a9e3db09742b90809d51638b7\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/uio/uio_hv_generic.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.16\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.16\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.1.91\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.31\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8.10\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.8.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/uio/uio_hv_generic.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/dabf12bf994318d939f70d47cfda30e47abb2c54\"}, {\"url\": \"https://git.kernel.org/stable/c/6466a0f6d235c8a18c602cb587160d7e49876db9\"}, {\"url\": \"https://git.kernel.org/stable/c/fe2c58602354fbd60680dc42ac3a0b772cda7d23\"}, {\"url\": \"https://git.kernel.org/stable/c/3d788b2fbe6a1a1a9e3db09742b90809d51638b7\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nuio_hv_generic: Don\u0027t free decrypted memory\\n\\nIn CoCo VMs it is possible for the untrusted host to cause\\nset_memory_encrypted() or set_memory_decrypted() to fail such that an\\nerror is returned and the resulting memory is shared. Callers need to\\ntake care to handle these errors to avoid returning decrypted (shared)\\nmemory to the page allocator, which could lead to functional or security\\nissues.\\n\\nThe VMBus device UIO driver could free decrypted/shared pages if\\nset_memory_decrypted() fails. Check the decrypted field in the gpadl\\nto decide whether to free the memory.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.91\", \"versionStartIncluding\": \"5.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.31\", \"versionStartIncluding\": \"5.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8.10\", \"versionStartIncluding\": \"5.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9\", \"versionStartIncluding\": \"5.16\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:31:57.546Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-36910\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:31:57.546Z\", \"dateReserved\": \"2024-05-30T15:25:07.067Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-30T15:29:08.902Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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