CVE-2024-36943

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Since\nptep_modify_prot_start() gets and clears atomically, the following is the\ncorrect pattern and prevents any possible race. Any access after the\nfirst call would see an invalid pte and cause a fault:\n\n pte = ptep_modify_prot_start(ptep);\n pte = pte_mkuffd_wp(pte);\n ptep_modify_prot_commit(ptep, pte);"}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H", "baseScore": 7.3, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerability is reached only through the PAGEMAP_SCAN ioctl on /proc/<pid>/pagemap combined with a userfaultfd WP-async registration, both of which require local execution on the host. There is no network-facing consumer of this path.\nAC:L - The attacker owns both sides of the race \u2014 sibling threads continuously writing to the mapped range set the hardware A/D bits while another thread loops PAGEMAP_SCAN with PM_SCAN_WP_MATCHING over millions of PTEs per iteration, so a hit is effectively guaranteed and can be retried without limit. No condition depends on external state the attacker cannot influence.\nPR:L - Only an ordinary unprivileged local account is needed: pagemap_open() requires just PTRACE_MODE_READ (trivial for /proc/self), the PAGEMAP_SCAN ioctl has no capability check, and userfaultfd_syscall_allowed() unconditionally permits UFFD_USER_MODE_ONLY so even vm.unprivileged_userfaultfd=0 does not block UFFD_FEATURE_WP_ASYNC registration. All required Kconfig options (PROC_PAGE_MONITOR, PTE_MARKER_UFFD_WP) are default-y in distro kernels.\nUI:N - The attacker drives the ioctl and the racing writes entirely from its own threads with no victim action required; when targeting another mm the victim's pre-existing uffd-wp-async registration is passive state, not an interaction.\nS:U - The lost PTE bits corrupt memory managed by the same kernel that contains the flaw, with no crossing of a hypervisor, IOMMU, or sandbox boundary. This is the standard unchanged-scope case for a kernel memory-management defect.\nC:L - Discarding the dirty bit causes a page's rewritten contents to be dropped and the stale swap-slot contents to be resurrected, so data a process deliberately overwrote or scrubbed (keys, credentials) persists in memory and on the swap device instead of being erased. This is a bounded exposure of previously-written data rather than an arbitrary kernel read primitive.\nI:H - Loss of the dirty bit makes the kernel silently drop modified pages \u2014 swap-cached anonymous pages revert to stale contents and MADV_FREE pages are discarded to zeros via the try_to_unmap_one discard path \u2014 with no error to the application. The attacker can repeat this across an unbounded number of pages, including in another process's mm it can ptrace-read (e.g. a CRIU- or VMM-managed workload using uffd-wp-async dirty tracking), amounting to total loss of integrity of that memory.\nA:H - Pages silently reverting to stale swap contents or being zeroed out corrupts live program state and reliably renders the affected process \u2014 including a targeted uffd-wp-async user such as a checkpoint/restore agent or live-migration VMM and its guest \u2014 non-functional or crashed. 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All required Kconfig options (PROC_PAGE_MONITOR, PTE_MARKER_UFFD_WP) are default-y in distro kernels.\nUI:N - The attacker drives the ioctl and the racing writes entirely from its own threads with no victim action required; when targeting another mm the victim's pre-existing uffd-wp-async registration is passive state, not an interaction.\nS:U - The lost PTE bits corrupt memory managed by the same kernel that contains the flaw, with no crossing of a hypervisor, IOMMU, or sandbox boundary. This is the standard unchanged-scope case for a kernel memory-management defect.\nC:L - Discarding the dirty bit causes a page's rewritten contents to be dropped and the stale swap-slot contents to be resurrected, so data a process deliberately overwrote or scrubbed (keys, credentials) persists in memory and on the swap device instead of being erased. 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Since\nptep_modify_prot_start() gets and clears atomically, the following is the\ncorrect pattern and prevents any possible race. Any access after the\nfirst call would see an invalid pte and cause a fault:\n\n pte = ptep_modify_prot_start(ptep);\n pte = pte_mkuffd_wp(pte);\n ptep_modify_prot_commit(ptep, pte);"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: fs/proc/task_mmu: corrige la p\u00e9rdida de bits j\u00f3venes/sucios durante el escaneo del mapa de p\u00e1ginas que make_uffd_wp_pte() estaba haciendo anteriormente: pte = ptep_get(ptep); ptep_modify_prot_start(ptep); pte = pte_mkuffd_wp(pte); ptep_modify_prot_commit(ptep,pte); Pero si otro hilo accedi\u00f3 o ensuci\u00f3 el pte entre las 2 primeras llamadas, esto podr\u00eda provocar la p\u00e9rdida de esa informaci\u00f3n. Dado que ptep_modify_prot_start() obtiene y borra at\u00f3micamente, el siguiente es el patr\u00f3n correcto y evita cualquier posible ejecuci\u00f3n. Cualquier acceso despu\u00e9s de la primera llamada ver\u00eda un pte no v\u00e1lido y provocar\u00eda una falla: pte = ptep_modify_prot_start(ptep); pte = pte_mkuffd_wp(pte); ptep_modify_prot_commit(ptep,pte);"}], "id": "CVE-2024-36943", "lastModified": "2026-08-04T11:18:33.553", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.3, "baseSeverity": "HIGH", "confidentialityImpact": "LOW", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.5, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-36943", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-06-05T18:15:10.001170Z", "version": "2.0.3"}}]}, "published": "2024-05-30T16:15:17.307", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/74b3d66f91d9f539f99faad74d796fa9a389a015"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c70dce4982ce1718bf978a35f8e26160b82081f4"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/74b3d66f91d9f539f99faad74d796fa9a389a015"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c70dce4982ce1718bf978a35f8e26160b82081f4"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: fs/proc/task_mmu: fix loss of young/dirty bits during pagemap scan", "id": "2284470", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2284470"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H", "status": "draft"}, "cwe": "CWE-367", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nfs/proc/task_mmu: fix loss of young/dirty bits during pagemap scan\nmake_uffd_wp_pte() was previously doing:\npte = ptep_get(ptep);\nptep_modify_prot_start(ptep);\npte = pte_mkuffd_wp(pte);\nptep_modify_prot_commit(ptep, pte);\nBut if another thread accessed or dirtied the pte between the first 2\ncalls, this could lead to loss of that information. Since\nptep_modify_prot_start() gets and clears atomically, the following is the\ncorrect pattern and prevents any possible race. Any access after the\nfirst call would see an invalid pte and cause a fault:\npte = ptep_modify_prot_start(ptep);\npte = pte_mkuffd_wp(pte);\nptep_modify_prot_commit(ptep, pte);"], "name": "CVE-2024-36943", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "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-2024-36943\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-36943\nhttps://lore.kernel.org/linux-cve-announce/2024053038-CVE-2024-36943-de68@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-07-12T22:31:27.894119+00:00", "updated": "2025-07-12T22:31:27.894177+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}