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Antes de eso, KVM asignaba expl\u00edcitamente la p\u00e1gina invitada a la memoria del kernel y marcaba la p\u00e1gina como sucia durante la fase de desasignaci\u00f3n. Marque la p\u00e1gina como sucia incluso si CMPXCHG falla, ya que los datos antiguos se vuelven a escribir en caso de fallo, es decir, la p\u00e1gina a\u00fan est\u00e1 escrita. Se garantiza que el valor escrito ser\u00e1 el mismo porque la operaci\u00f3n es at\u00f3mica, pero la ABI de KVM es que todas las escrituras se registran de forma sucia independientemente del valor escrito. Y lo que es m\u00e1s importante, eso es lo que hizo KVM antes de la confirmaci\u00f3n del error. Felicitaciones enormes a las personas en la lista Cc (y a muchos otros), que hicieron todo el trabajo de clasificaci\u00f3n y depuraci\u00f3n. confirmaci\u00f3n base: 6769ea8da8a93ed4630f1ce64df6aafcaabfce64"}], "id": "CVE-2024-35804", "lastModified": "2025-09-19T15:58:56.647", "metrics": {"cvssMetricV31": [{"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"}]}, "published": "2024-05-17T14:15:13.550", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/225d587a073584946c05c9b7651d637bd45c0c71"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/726374dde5d608b15b9756bd52b6fc283fda7a06"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/910c57dfa4d113aae6571c2a8b9ae8c430975902"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9d1b22e573a3789ed1f32033ee709106993ba551"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a9bd6bb6f02bf7132c1ab192ba62bbfa52df7d66"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/225d587a073584946c05c9b7651d637bd45c0c71"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/726374dde5d608b15b9756bd52b6fc283fda7a06"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/910c57dfa4d113aae6571c2a8b9ae8c430975902"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9d1b22e573a3789ed1f32033ee709106993ba551"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a9bd6bb6f02bf7132c1ab192ba62bbfa52df7d66"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: KVM: x86: Mark target gfn of emulated atomic instruction as dirty", "id": "2281227", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2281227"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nKVM: x86: Mark target gfn of emulated atomic instruction as dirty\nWhen emulating an atomic access on behalf of the guest, mark the target\ngfn dirty if the CMPXCHG by KVM is attempted and doesn't fault. This\nfixes a bug where KVM effectively corrupts guest memory during live\nmigration by writing to guest memory without informing userspace that the\npage is dirty.\nMarking the page dirty got unintentionally dropped when KVM's emulated\nCMPXCHG was converted to do a user access. Before that, KVM explicitly\nmapped the guest page into kernel memory, and marked the page dirty during\nthe unmap phase.\nMark the page dirty even if the CMPXCHG fails, as the old data is written\nback on failure, i.e. the page is still written. The value written is\nguaranteed to be the same because the operation is atomic, but KVM's ABI\nis that all writes are dirty logged regardless of the value written. And\nmore importantly, that's what KVM did before the buggy commit.\nHuge kudos to the folks on the Cc list (and many others), who did all the\nactual work of triaging and debugging.\nbase-commit: 6769ea8da8a93ed4630f1ce64df6aafcaabfce64"], "name": "CVE-2024-35804", "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": "Not affected", "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": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Under investigation", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-17T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-35804\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-35804\nhttps://lore.kernel.org/linux-cve-announce/2024051739-CVE-2024-35804-bd95@gregkh/T"], "threat_severity": "Low"}

{"created": "2025-07-13T11:23:01.642934+00:00", "updated": "2025-07-13T11:23:01.643039+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}