{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2024-36943", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-30T15:25:07.073Z", "datePublished": "2024-05-30T15:35:42.119Z", "dateUpdated": "2025-05-04T09:12:32.403Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-05-04T09:12:32.403Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/proc/task_mmu: fix loss of young/dirty bits during pagemap scan\n\nmake_uffd_wp_pte() was previously doing:\n\n  pte = ptep_get(ptep);\n  ptep_modify_prot_start(ptep);\n  pte = pte_mkuffd_wp(pte);\n  ptep_modify_prot_commit(ptep, pte);\n\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:\n\n  pte = ptep_modify_prot_start(ptep);\n  pte = pte_mkuffd_wp(pte);\n  ptep_modify_prot_commit(ptep, pte);"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/proc/task_mmu.c"], "versions": [{"version": "52526ca7fdb905a768a93f8faa418e9b988fc34b", "lessThan": "74b3d66f91d9f539f99faad74d796fa9a389a015", "status": "affected", "versionType": "git"}, {"version": "52526ca7fdb905a768a93f8faa418e9b988fc34b", "lessThan": "c70dce4982ce1718bf978a35f8e26160b82081f4", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/proc/task_mmu.c"], "versions": [{"version": "6.7", "status": "affected"}, {"version": "0", "lessThan": "6.7", "status": "unaffected", "versionType": "semver"}, {"version": "6.8.10", "lessThanOrEqual": "6.8.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.9", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.8.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.9"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/74b3d66f91d9f539f99faad74d796fa9a389a015"}, {"url": "https://git.kernel.org/stable/c/c70dce4982ce1718bf978a35f8e26160b82081f4"}], "title": "fs/proc/task_mmu: fix loss of young/dirty bits during pagemap scan", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2024-06-05T18:15:10.001170Z", "id": "CVE-2024-36943", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-05T18:17:48.241Z"}}, {"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T03:43:50.375Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/74b3d66f91d9f539f99faad74d796fa9a389a015", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/c70dce4982ce1718bf978a35f8e26160b82081f4", "tags": ["x_transferred"]}]}]}}

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{"descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/proc/task_mmu: fix loss of young/dirty bits during pagemap scan\n\nmake_uffd_wp_pte() was previously doing:\n\n  pte = ptep_get(ptep);\n  ptep_modify_prot_start(ptep);\n  pte = pte_mkuffd_wp(pte);\n  ptep_modify_prot_commit(ptep, pte);\n\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:\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": "2024-11-21T09:22:52.417", "metrics": {}, "published": "2024-05-30T16:15:17.307", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/74b3d66f91d9f539f99faad74d796fa9a389a015"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c70dce4982ce1718bf978a35f8e26160b82081f4"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://git.kernel.org/stable/c/74b3d66f91d9f539f99faad74d796fa9a389a015"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://git.kernel.org/stable/c/c70dce4982ce1718bf978a35f8e26160b82081f4"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"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"}