CVE-2024-36911

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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 netvsc 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."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - The attacker is the untrusted hypervisor/host, which reaches the guest only through the paravirtualized VMBus/hypercall interface rather than any network stack; from the guest's perspective this is the local virtual-hardware path (`tdx_map_gpa()` / `hv_mark_gpa_visibility()` return values). No network, adjacent-network, or physical access to the guest is involved.\nAC:L - The host deterministically controls the outcome \u2014 it simply returns an error from the TDVMCALL<MapGPA> or HVCALL_MODIFY_SPARSE_GPA_PAGE_HOST_VISIBILITY hypercall at a moment of its choosing, and the PTE encryption bit has already been cleared by `__change_page_attr_set_clr()` before that call. It can also force unlimited retries via suspend/resume and VF hot-plug cycles, so nothing depends on conditions outside its control.\nPR:N - In the confidential-computing threat model the host holds zero privileges inside the guest \u2014 that is the entire premise of TDX/SEV-SNP \u2014 and needs no guest account or capability to fail the conversion hypercall. The vulnerable path runs at netvsc probe during guest boot with no guest-side authentication.\nUI:N - The GPADL for the receive/send buffers is established automatically during `netvsc_init_buf()` at driver probe on every guest boot, and the host can independently drive further detach/attach cycles via `netvsc_suspend`/`netvsc_resume`. No guest user action is required.\nS:U - The impacted resources are guest kernel and guest userspace memory, which fall under the same security authority as the vulnerable component (the guest Linux kernel). This is a host-to-guest attack, not an escape from the vulnerable component's scope such as a guest-to-host breakout.\nC:H - Up to 46MB of still-shared pages are returned to the buddy allocator and recycled for arbitrary kernel and user data, which the untrusted host can then read in plaintext \u2014 keys, credentials, and any guest secret that lands in those pages. 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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 netvsc 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."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: hv_netvsc: no liberar memoria descifrada. En las m\u00e1quinas virtuales CoCo, es posible que el host que no es de confianza provoque que set_memory_encrypted() o set_memory_decrypted() falle, de modo que se devuelva un error y el resultado La memoria es compartida. Las personas que llaman deben tener cuidado al manejar estos errores para evitar devolver memoria descifrada (compartida) al asignador de p\u00e1ginas, lo que podr\u00eda provocar problemas funcionales o de seguridad. El controlador netvsc podr\u00eda liberar p\u00e1ginas descifradas/compartidas si falla set_memory_decrypted(). Verifique el campo descifrado en gpadl para decidir si desea liberar la memoria."}], "id": "CVE-2024-36911", "lastModified": "2026-10-30T13:17:28.083", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-36911", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-05-30T18:46:51.712672Z", "version": "2.0.3"}}]}, "published": "2024-05-30T16:15:14.530", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4aaed9dbe8acd2b6114458f0498a617283d6275b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a56fe611326332bf6b7126e5559590c57dcebad4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bbf9ac34677b57506a13682b31a2a718934c0e31"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fb671512ffb26570c05ba3fbe20752e645809192"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4aaed9dbe8acd2b6114458f0498a617283d6275b"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a56fe611326332bf6b7126e5559590c57dcebad4"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bbf9ac34677b57506a13682b31a2a718934c0e31"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: hv_netvsc: Don&#39;t free decrypted memory", "id": "2284531", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2284531"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N", "status": "draft"}, "cwe": "CWE-402", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nhv_netvsc: Don't free decrypted memory\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.\nThe netvsc 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."], "name": "CVE-2024-36911", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-30T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-36911\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-36911\nhttps://lore.kernel.org/linux-cve-announce/2024053037-CVE-2024-36911-5ef6@gregkh/T"], "threat_severity": "Low"}

{"created": "2025-07-12T22:09:24.651667+00:00", "updated": "2025-07-12T22:09:24.651715+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}