{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2024-35929", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-17T13:50:33.129Z", "datePublished": "2024-05-19T10:10:38.388Z", "dateUpdated": "2026-05-11T20:13:55.186Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T20:13:55.186Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrcu/nocb: Fix WARN_ON_ONCE() in the rcu_nocb_bypass_lock()\n\nFor the kernels built with CONFIG_RCU_NOCB_CPU_DEFAULT_ALL=y and\nCONFIG_RCU_LAZY=y, the following scenarios will trigger WARN_ON_ONCE()\nin the rcu_nocb_bypass_lock() and rcu_nocb_wait_contended() functions:\n\n CPU2 CPU11\nkthread\nrcu_nocb_cb_kthread ksys_write\nrcu_do_batch vfs_write\nrcu_torture_timer_cb proc_sys_write\n__kmem_cache_free proc_sys_call_handler\nkmemleak_free drop_caches_sysctl_handler\ndelete_object_full drop_slab\n__delete_object shrink_slab\nput_object lazy_rcu_shrink_scan\ncall_rcu rcu_nocb_flush_bypass\n__call_rcu_commn rcu_nocb_bypass_lock\n raw_spin_trylock(&rdp->nocb_bypass_lock) fail\n atomic_inc(&rdp->nocb_lock_contended);\nrcu_nocb_wait_contended WARN_ON_ONCE(smp_processor_id() != rdp->cpu);\n WARN_ON_ONCE(atomic_read(&rdp->nocb_lock_contended)) |\n |_ _ _ _ _ _ _ _ _ _same rdp and rdp->cpu != 11_ _ _ _ _ _ _ _ _ __|\n\nReproduce this bug with \"echo 3 > /proc/sys/vm/drop_caches\".\n\nThis commit therefore uses rcu_nocb_try_flush_bypass() instead of\nrcu_nocb_flush_bypass() in lazy_rcu_shrink_scan(). If the nocb_bypass\nqueue is being flushed, then rcu_nocb_try_flush_bypass will return\ndirectly."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/rcu/tree_nocb.h"], "versions": [{"version": "7625926086765123251f765d91fc3a70617d334d", "lessThan": "4d58c9fb45c70e62c19e8be3f3605889c47601bc", "status": "affected", "versionType": "git"}, {"version": "7625926086765123251f765d91fc3a70617d334d", "lessThan": "927d1f4f77e4784ab3944a9df86ab14d1cd3185a", "status": "affected", "versionType": "git"}, {"version": "7625926086765123251f765d91fc3a70617d334d", "lessThan": "dda98810b552fc6bf650f4270edeebdc2f28bd3f", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/rcu/tree_nocb.h"], "versions": [{"version": "6.5", "status": "affected"}, {"version": "0", "lessThan": "6.5", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.27", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.8.6", "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": "6.5", "versionEndExcluding": "6.6.27"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.8.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.9"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/4d58c9fb45c70e62c19e8be3f3605889c47601bc"}, {"url": "https://git.kernel.org/stable/c/927d1f4f77e4784ab3944a9df86ab14d1cd3185a"}, {"url": "https://git.kernel.org/stable/c/dda98810b552fc6bf650f4270edeebdc2f28bd3f"}], "title": "rcu/nocb: Fix WARN_ON_ONCE() in the rcu_nocb_bypass_lock()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-35929", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-05-23T19:21:22.724357Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T17:34:50.854Z"}}, {"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T03:21:49.023Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/4d58c9fb45c70e62c19e8be3f3605889c47601bc", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/927d1f4f77e4784ab3944a9df86ab14d1cd3185a", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/dda98810b552fc6bf650f4270edeebdc2f28bd3f", "tags": ["x_transferred"]}]}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/4d58c9fb45c70e62c19e8be3f3605889c47601bc", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/927d1f4f77e4784ab3944a9df86ab14d1cd3185a", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/dda98810b552fc6bf650f4270edeebdc2f28bd3f", "tags": ["x_transferred"]}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T03:21:49.023Z"}}, {"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-35929", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-05-23T19:21:22.724357Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-05-23T19:21:26.648Z"}, "title": "CISA ADP Vulnrichment"}], "cna": {"title": "rcu/nocb: Fix WARN_ON_ONCE() in the rcu_nocb_bypass_lock()", "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "7625926086765123251f765d91fc3a70617d334d", "lessThan": "4d58c9fb45c70e62c19e8be3f3605889c47601bc", "versionType": "git"}, {"status": "affected", "version": "7625926086765123251f765d91fc3a70617d334d", "lessThan": "927d1f4f77e4784ab3944a9df86ab14d1cd3185a", "versionType": "git"}, {"status": "affected", "version": "7625926086765123251f765d91fc3a70617d334d", "lessThan": "dda98810b552fc6bf650f4270edeebdc2f28bd3f", "versionType": "git"}], "programFiles": ["kernel/rcu/tree_nocb.h"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.5"}, {"status": "unaffected", "version": "0", "lessThan": "6.5", "versionType": "semver"}, {"status": "unaffected", "version": "6.6.27", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.8.6", "versionType": "semver", "lessThanOrEqual": "6.8.*"}, {"status": "unaffected", "version": "6.9", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["kernel/rcu/tree_nocb.h"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/4d58c9fb45c70e62c19e8be3f3605889c47601bc"}, {"url": "https://git.kernel.org/stable/c/927d1f4f77e4784ab3944a9df86ab14d1cd3185a"}, {"url": "https://git.kernel.org/stable/c/dda98810b552fc6bf650f4270edeebdc2f28bd3f"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrcu/nocb: Fix WARN_ON_ONCE() in the rcu_nocb_bypass_lock()\n\nFor the kernels built with CONFIG_RCU_NOCB_CPU_DEFAULT_ALL=y and\nCONFIG_RCU_LAZY=y, the following scenarios will trigger WARN_ON_ONCE()\nin the rcu_nocb_bypass_lock() and rcu_nocb_wait_contended() functions:\n\n CPU2 CPU11\nkthread\nrcu_nocb_cb_kthread ksys_write\nrcu_do_batch vfs_write\nrcu_torture_timer_cb proc_sys_write\n__kmem_cache_free proc_sys_call_handler\nkmemleak_free drop_caches_sysctl_handler\ndelete_object_full drop_slab\n__delete_object shrink_slab\nput_object lazy_rcu_shrink_scan\ncall_rcu rcu_nocb_flush_bypass\n__call_rcu_commn rcu_nocb_bypass_lock\n raw_spin_trylock(&rdp->nocb_bypass_lock) fail\n atomic_inc(&rdp->nocb_lock_contended);\nrcu_nocb_wait_contended WARN_ON_ONCE(smp_processor_id() != rdp->cpu);\n WARN_ON_ONCE(atomic_read(&rdp->nocb_lock_contended)) |\n |_ _ _ _ _ _ _ _ _ _same rdp and rdp->cpu != 11_ _ _ _ _ _ _ _ _ __|\n\nReproduce this bug with \"echo 3 > /proc/sys/vm/drop_caches\".\n\nThis commit therefore uses rcu_nocb_try_flush_bypass() instead of\nrcu_nocb_flush_bypass() in lazy_rcu_shrink_scan(). If the nocb_bypass\nqueue is being flushed, then rcu_nocb_try_flush_bypass will return\ndirectly."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.27", "versionStartIncluding": "6.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.8.6", "versionStartIncluding": "6.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.9", "versionStartIncluding": "6.5"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T20:13:55.186Z"}}}, "cveMetadata": {"cveId": "CVE-2024-35929", "state": "PUBLISHED", "dateUpdated": "2026-05-11T20:13:55.186Z", "dateReserved": "2024-05-17T13:50:33.129Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-05-19T10:10:38.388Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "06E895C1-812D-4DD3-AC6C-7069937B982A", "versionEndExcluding": "6.6.27", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "22CA5433-1303-41EF-AD4C-F4645DC01541", "versionEndExcluding": "6.8.6", "versionStartIncluding": "6.7", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrcu/nocb: Fix WARN_ON_ONCE() in the rcu_nocb_bypass_lock()\n\nFor the kernels built with CONFIG_RCU_NOCB_CPU_DEFAULT_ALL=y and\nCONFIG_RCU_LAZY=y, the following scenarios will trigger WARN_ON_ONCE()\nin the rcu_nocb_bypass_lock() and rcu_nocb_wait_contended() functions:\n\n CPU2 CPU11\nkthread\nrcu_nocb_cb_kthread ksys_write\nrcu_do_batch vfs_write\nrcu_torture_timer_cb proc_sys_write\n__kmem_cache_free proc_sys_call_handler\nkmemleak_free drop_caches_sysctl_handler\ndelete_object_full drop_slab\n__delete_object shrink_slab\nput_object lazy_rcu_shrink_scan\ncall_rcu rcu_nocb_flush_bypass\n__call_rcu_commn rcu_nocb_bypass_lock\n raw_spin_trylock(&rdp->nocb_bypass_lock) fail\n atomic_inc(&rdp->nocb_lock_contended);\nrcu_nocb_wait_contended WARN_ON_ONCE(smp_processor_id() != rdp->cpu);\n WARN_ON_ONCE(atomic_read(&rdp->nocb_lock_contended)) |\n |_ _ _ _ _ _ _ _ _ _same rdp and rdp->cpu != 11_ _ _ _ _ _ _ _ _ __|\n\nReproduce this bug with \"echo 3 > /proc/sys/vm/drop_caches\".\n\nThis commit therefore uses rcu_nocb_try_flush_bypass() instead of\nrcu_nocb_flush_bypass() in lazy_rcu_shrink_scan(). If the nocb_bypass\nqueue is being flushed, then rcu_nocb_try_flush_bypass will return\ndirectly."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: rcu/nocb: corrija WARN_ON_ONCE() en rcu_nocb_bypass_lock() Para los kernels creados con CONFIG_RCU_NOCB_CPU_DEFAULT_ALL=y y CONFIG_RCU_LAZY=y, los siguientes escenarios activar\u00e1n WARN_ON_ONCE() en rcu_nocb_bypass_lock( ) y funciones rcu_nocb_wait_contended(): CPU2 CPU11 kthread rcu_nocb_cb_kthread ksys_write rcu_do_batch vfs_write rcu_torture_timer_cb proc_sys_write __kmem_cache_free proc_sys_call_handler kmemleak_free drop_caches_sysctl_handler delete_object_full losa __delete_object encogimiento_slab put_object lazy_rcu_shrink_scan call_rcu rcu_nocb_flush_bypass __call_rcu_commn rcu_nocb_bypass_lock raw_spin_trylock(&rdp->nocb_bypass_lock) fail atomic_inc(&rdp->nocb_lock_contended); rcu_nocb_wait_contended WARN_ON_ONCE(smp_processor_id()!= rdp->cpu); WARN_ON_ONCE(atomic_read(&rdp->nocb_lock_contended)) | |_ _ _ _ _ _ _ _ _ _mismo rdp y rdp->cpu != 11_ _ _ _ _ _ _ _ _ __| Reproduzca este error con \"echo 3 > /proc/sys/vm/drop_caches\". Por lo tanto, esta confirmaci\u00f3n utiliza rcu_nocb_try_flush_bypass() en lugar de rcu_nocb_flush_bypass() en lazy_rcu_shrink_scan(). Si se est\u00e1 vaciando la cola nocb_bypass, entonces rcu_nocb_try_flush_bypass regresar\u00e1 directamente."}], "id": "CVE-2024-35929", "lastModified": "2024-12-30T19:56:30.927", "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": "nvd@nist.gov", "type": "Primary"}]}, "published": "2024-05-19T11:15:48.993", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4d58c9fb45c70e62c19e8be3f3605889c47601bc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/927d1f4f77e4784ab3944a9df86ab14d1cd3185a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/dda98810b552fc6bf650f4270edeebdc2f28bd3f"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4d58c9fb45c70e62c19e8be3f3605889c47601bc"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/927d1f4f77e4784ab3944a9df86ab14d1cd3185a"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/dda98810b552fc6bf650f4270edeebdc2f28bd3f"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: rcu/nocb: Fix WARN_ON_ONCE() in the rcu_nocb_bypass_lock()", "id": "2281514", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2281514"}, "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:\nrcu/nocb: Fix WARN_ON_ONCE() in the rcu_nocb_bypass_lock()\nFor the kernels built with CONFIG_RCU_NOCB_CPU_DEFAULT_ALL=y and\nCONFIG_RCU_LAZY=y, the following scenarios will trigger WARN_ON_ONCE()\nin the rcu_nocb_bypass_lock() and rcu_nocb_wait_contended() functions:\nCPU2 CPU11\nkthread\nrcu_nocb_cb_kthread ksys_write\nrcu_do_batch vfs_write\nrcu_torture_timer_cb proc_sys_write\n__kmem_cache_free proc_sys_call_handler\nkmemleak_free drop_caches_sysctl_handler\ndelete_object_full drop_slab\n__delete_object shrink_slab\nput_object lazy_rcu_shrink_scan\ncall_rcu rcu_nocb_flush_bypass\n__call_rcu_commn rcu_nocb_bypass_lock\nraw_spin_trylock(&rdp->nocb_bypass_lock) fail\natomic_inc(&rdp->nocb_lock_contended);\nrcu_nocb_wait_contended WARN_ON_ONCE(smp_processor_id() != rdp->cpu);\nWARN_ON_ONCE(atomic_read(&rdp->nocb_lock_contended)) |\n|_ _ _ _ _ _ _ _ _ _same rdp and rdp->cpu != 11_ _ _ _ _ _ _ _ _ __|\nReproduce this bug with \"echo 3 > /proc/sys/vm/drop_caches\".\nThis commit therefore uses rcu_nocb_try_flush_bypass() instead of\nrcu_nocb_flush_bypass() in lazy_rcu_shrink_scan(). If the nocb_bypass\nqueue is being flushed, then rcu_nocb_try_flush_bypass will return\ndirectly.", "This is a vulnerability in the Linux kernel's RCU (Read-Copy Update) subsystem, specifically affecting configurations that enable lazy RCU operations (CONFIG_RCU_NOCB_CPU_DEFAULT_ALL and CONFIG_RCU_LAZY). Under certain conditions, operations like writing to /proc/sys/vm/drop_caches could trigger warnings due to unsafe handling of the RCU nocb bypass queue. This issue may result in system instability or undefined behavior. The vulnerability has been resolved by improving how the nocb bypass queue is managed to ensure safer concurrency. Users should update to a patched kernel version to prevent potential disruptions."], "name": "CVE-2024-35929", "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": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Under investigation", "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": "2024-05-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-35929\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-35929\nhttps://lore.kernel.org/linux-cve-announce/2024051916-CVE-2024-35929-6f74@gregkh/T"], "threat_severity": "Moderate"}

{}