CVE-2024-43832

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So grab a temporary reference."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable code is reached through the s390 KVM protected-virtualization path \u2014 the `KVM_S390_PV_COMMAND`/`KVM_RUN` ioctls on /dev/kvm and the host's secure/non-secure storage-access fault handler running in the vCPU thread. No network input is involved, so local system access is required.\nAC:L - The attacker controls both sides of the race: it forces `rc == -EAGAIN` deterministically (start writeback on the file/shmem-backed guest page so `make_folio_secure()` returns -EAGAIN, or hold the folio lock) while a second thread `MADV_DONTNEED`s/munmaps that guest memory to free the folio in the window after the PTL and mmap_read_lock are dropped. The attempt is cheap and infinitely retryable.\nPR:L - Only an unprivileged local user with access to /dev/kvm (commonly mode 0666 or the `kvm` group on distros) is needed to create a VM, enable protected virtualization, and drive the unpack/secure-storage paths; no CAP_SYS_ADMIN or real root is required. A malicious guest reaching `handle_pv_uvc()` with a guest-controlled address is likewise not a privileged host actor.\nUI:N - The entire sequence is performed by the attacker's own threads via ioctls and memory-management syscalls on its own VM. No victim action of any kind is needed.\nS:U - The attacking process and the corrupted resources (host kernel MM metadata) live under the same security authority \u2014 this is a local host-kernel compromise, not an IOMMU or hypervisor-boundary escape granting control of a separate authority.\nC:H - This is a use-after-free on a folio whose `struct page` has been reallocated to an unrelated owner; the code reads that stale state and the resulting page-state corruption is leverageable for disclosure of memory belonging to other subsystems. Per UAF scoring guidance, confidentiality impact is High.\nI:H - `folio_wait_bit_common()` performs an atomic `set_bit(PG_waiters, &folio->flags)` write into a `struct page` that now describes someone else's allocation, corrupting core MM metadata for a page the attacker can influence the reuse of via heap/page grooming \u2014 a write primitive into kernel state, hence High.\nA:H - A stale `PG_writeback` bit in the reused page makes `folio_wait_bit()` sleep TASK_UNINTERRUPTIBLE with no waker, producing an unkillable task and hung-task panics, while a spurious `PG_waiters` trips `bad_page()` (\"BUG: Bad page state\") since `PAGE_FLAGS_CHECK_AT_PREP` covers the whole flags mask. 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After we dropped the PTL, the\nfolio could get freed concurrently. So grab a temporary reference."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: s390/uv: No llamar a folio_wait_writeback() sin una referencia de folio folio_wait_writeback() requiere que no se mantengan bloqueos de giro y que se mantenga una referencia de folio, como est\u00e1 documentado. Despu\u00e9s de que eliminemos el PTL, el folio podr\u00eda liberarse al mismo tiempo. As\u00ed que toma una referencia temporal."}], "id": "CVE-2024-43832", "lastModified": "2026-08-04T11:19:53.320", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "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-2024-43832", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-10T16:08:24.816195Z", "version": "2.0.3"}}]}, "published": "2024-08-17T10:15:08.980", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1a1eb2f3fc453dcd52726d13e863938561489cb7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3f29f6537f54d74e64bac0a390fb2e26da25800d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8736604ef53359a718c246087cd21dcec232d2fb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b21aba72aadd94bdac275deab021fc84d6c72b16"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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{"created": "2025-07-12T22:01:13.411447+00:00", "updated": "2025-07-12T22:01:13.411509+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}