CVE-2024-57849

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2024-57849", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-01-11T12:33:33.699Z", "datePublished": "2025-01-11T14:30:58.365Z", "dateUpdated": "2026-10-15T21:51:49.282Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:46:40.129Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/cpum_sf: Handle CPU hotplug remove during sampling\n\nCPU hotplug remove handling triggers the following function\ncall sequence:\n\n CPUHP_AP_PERF_S390_SF_ONLINE --> s390_pmu_sf_offline_cpu()\n ...\n CPUHP_AP_PERF_ONLINE --> perf_event_exit_cpu()\n\nThe s390 CPUMF sampling CPU hotplug handler invokes:\n\n s390_pmu_sf_offline_cpu()\n +--> cpusf_pmu_setup()\n +--> setup_pmc_cpu()\n +--> deallocate_buffers()\n\nThis function de-allocates all sampling data buffers (SDBs) allocated\nfor that CPU at event initialization. It also clears the\nPMU_F_RESERVED bit. The CPU is gone and can not be sampled.\n\nWith the event still being active on the removed CPU, the CPU event\nhotplug support in kernel performance subsystem triggers the\nfollowing function calls on the removed CPU:\n\n perf_event_exit_cpu()\n +--> perf_event_exit_cpu_context()\n +--> __perf_event_exit_context()\n\t +--> __perf_remove_from_context()\n\t +--> event_sched_out()\n\t +--> cpumsf_pmu_del()\n\t +--> cpumsf_pmu_stop()\n +--> hw_perf_event_update()\n\nto stop and remove the event. During removal of the event, the\nsampling device driver tries to read out the remaining samples from\nthe sample data buffers (SDBs). But they have already been freed\n(and may have been re-assigned). This may lead to a use after free\nsituation in which case the samples are most likely invalid. In the\nbest case the memory has not been reassigned and still contains\nvalid data.\n\nRemedy this situation and check if the CPU is still in reserved\nstate (bit PMU_F_RESERVED set). In this case the SDBs have not been\nreleased an contain valid data. This is always the case when\nthe event is removed (and no CPU hotplug off occured).\nIf the PMU_F_RESERVED bit is not set, the SDB buffers are gone."}], "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 vulnerability is reached through the local `perf_event_open()` syscall establishing a CPUM_SF sampling event combined with a CPU hot-unplug of that CPU; no network or adjacent-network path exists.\nAC:L - The attacker keeps a per-CPU sampling event installed indefinitely so any CPU-offline transition deterministically hits the freed SDBs, and on Linux on Z the offline side is attacker-influenceable (cpuplugd unplugs CPUs based on load the attacker generates) or directly performed, making the trigger repeatable rather than a narrow race.\nPR:L - A local unprivileged account suffices to hold the CPUM_SF sampling session on systems where perf_event_paranoid is relaxed \u2014 the standard configuration on IBM Z hosts that use CPUMF sampling for profiling \u2014 while the CPU-offline transition is supplied by the routinely-active cpuplugd daemon or hypervisor CPU reconfiguration rather than by the attacker's own privileges.\nUI:N - No victim action is required; the sampling event and the CPU hotplug transition are system/administrative operations, not interactions of a targeted user with attacker-supplied content.\nS:U - The use-after-free corrupts kernel memory within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `hw_collect_samples()` reads `hws_basic_entry` records out of freed and reallocated pages and pushes them to userspace through `perf_push_sample()`, leaking arbitrary reused kernel memory into the attacker-readable perf ring buffer, with the target address taken from a freed-page value fed to `phys_to_virt()`.\nI:H - The stale walk writes into freed/reallocated memory via `sample->def = 0` and `cmpxchg128(&te->header.val, ...)`, at addresses derived from freed-page contents, giving a memory-corruption primitive usable against arbitrary reallocated kernel objects.\nA:H - Dereferencing a bogus physical address obtained from freed memory, plus corruption of pages already reassigned to other kernel users, reliably produces a kernel oops or panic."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/s390/kernel/perf_cpum_sf.c"], "versions": [{"version": "e3d617fe6ac7294974fc513dc5e4d8ada8080fd1", "lessThan": "238e3af849dfdcb1faed544349f7025e533f9aab", "status": "affected", "versionType": "git"}, {"version": "e3d617fe6ac7294974fc513dc5e4d8ada8080fd1", "lessThan": "99192c735ed4bfdff0d215ec85c8a87a677cb898", "status": "affected", "versionType": "git"}, {"version": "e3d617fe6ac7294974fc513dc5e4d8ada8080fd1", "lessThan": "06a92f810df8037ca36157282ddcbefdcaf049b8", "status": "affected", "versionType": "git"}, {"version": "e3d617fe6ac7294974fc513dc5e4d8ada8080fd1", "lessThan": "b5be6a0bb639d165c8418d8dddd8f322587be8be", "status": "affected", "versionType": "git"}, {"version": "e3d617fe6ac7294974fc513dc5e4d8ada8080fd1", "lessThan": "a69752f1e5de817941a2ea0609254f6f25acd274", "status": "affected", "versionType": "git"}, {"version": "e3d617fe6ac7294974fc513dc5e4d8ada8080fd1", "lessThan": "be54e6e0f93a39a9c00478d70d12956a5f3d5b9b", "status": "affected", "versionType": "git"}, {"version": "e3d617fe6ac7294974fc513dc5e4d8ada8080fd1", "lessThan": "a0bd7dacbd51c632b8e2c0500b479af564afadf3", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/s390/kernel/perf_cpum_sf.c"], "versions": [{"version": "4.8", "status": "affected"}, {"version": "0", "lessThan": "4.8", "status": "unaffected", "versionType": "semver"}, {"version": "5.4.287", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.231", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.174", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.120", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.66", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.5", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.13", "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": "4.8", "versionEndExcluding": "5.4.287"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "5.10.231"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "5.15.174"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.1.120"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.6.66"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.12.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.13"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/238e3af849dfdcb1faed544349f7025e533f9aab"}, {"url": "https://git.kernel.org/stable/c/99192c735ed4bfdff0d215ec85c8a87a677cb898"}, {"url": "https://git.kernel.org/stable/c/06a92f810df8037ca36157282ddcbefdcaf049b8"}, {"url": "https://git.kernel.org/stable/c/b5be6a0bb639d165c8418d8dddd8f322587be8be"}, {"url": "https://git.kernel.org/stable/c/a69752f1e5de817941a2ea0609254f6f25acd274"}, {"url": "https://git.kernel.org/stable/c/be54e6e0f93a39a9c00478d70d12956a5f3d5b9b"}, {"url": "https://git.kernel.org/stable/c/a0bd7dacbd51c632b8e2c0500b479af564afadf3"}], "title": "s390/cpum_sf: Handle CPU hotplug remove during sampling", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T20:54:42.821Z"}}, {"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-57849", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-15T21:41:33.008491Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T21:51:49.282Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T20:54:42.821Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-57849", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-15T21:41:33.008491Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T21:41:33.925Z"}}], "cna": {"title": "s390/cpum_sf: Handle CPU hotplug remove during sampling", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.8, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerability is reached through the local `perf_event_open()` syscall establishing a CPUM_SF sampling event combined with a CPU hot-unplug of that CPU; no network or adjacent-network path exists.\nAC:L - The attacker keeps a per-CPU sampling event installed indefinitely so any CPU-offline transition deterministically hits the freed SDBs, and on Linux on Z the offline side is attacker-influenceable (cpuplugd unplugs CPUs based on load the attacker generates) or directly performed, making the trigger repeatable rather than a narrow race.\nPR:L - A local unprivileged account suffices to hold the CPUM_SF sampling session on systems where perf_event_paranoid is relaxed \u2014 the standard configuration on IBM Z hosts that use CPUMF sampling for profiling \u2014 while the CPU-offline transition is supplied by the routinely-active cpuplugd daemon or hypervisor CPU reconfiguration rather than by the attacker's own privileges.\nUI:N - No victim action is required; the sampling event and the CPU hotplug transition are system/administrative operations, not interactions of a targeted user with attacker-supplied content.\nS:U - The use-after-free corrupts kernel memory within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `hw_collect_samples()` reads `hws_basic_entry` records out of freed and reallocated pages and pushes them to userspace through `perf_push_sample()`, leaking arbitrary reused kernel memory into the attacker-readable perf ring buffer, with the target address taken from a freed-page value fed to `phys_to_virt()`.\nI:H - The stale walk writes into freed/reallocated memory via `sample->def = 0` and `cmpxchg128(&te->header.val, ...)`, at addresses derived from freed-page contents, giving a memory-corruption primitive usable against arbitrary reallocated kernel objects.\nA:H - Dereferencing a bogus physical address obtained from freed memory, plus corruption of pages already reassigned to other kernel users, reliably produces a kernel oops or panic."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "e3d617fe6ac7294974fc513dc5e4d8ada8080fd1", "lessThan": "238e3af849dfdcb1faed544349f7025e533f9aab", "versionType": "git"}, {"status": "affected", "version": "e3d617fe6ac7294974fc513dc5e4d8ada8080fd1", "lessThan": "99192c735ed4bfdff0d215ec85c8a87a677cb898", "versionType": "git"}, {"status": "affected", "version": "e3d617fe6ac7294974fc513dc5e4d8ada8080fd1", "lessThan": "06a92f810df8037ca36157282ddcbefdcaf049b8", "versionType": "git"}, {"status": "affected", "version": "e3d617fe6ac7294974fc513dc5e4d8ada8080fd1", "lessThan": "b5be6a0bb639d165c8418d8dddd8f322587be8be", "versionType": "git"}, {"status": "affected", "version": "e3d617fe6ac7294974fc513dc5e4d8ada8080fd1", "lessThan": "a69752f1e5de817941a2ea0609254f6f25acd274", "versionType": "git"}, {"status": "affected", "version": "e3d617fe6ac7294974fc513dc5e4d8ada8080fd1", "lessThan": "be54e6e0f93a39a9c00478d70d12956a5f3d5b9b", "versionType": "git"}, {"status": "affected", "version": "e3d617fe6ac7294974fc513dc5e4d8ada8080fd1", "lessThan": "a0bd7dacbd51c632b8e2c0500b479af564afadf3", "versionType": "git"}], "programFiles": ["arch/s390/kernel/perf_cpum_sf.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.8"}, {"status": "unaffected", "version": "0", "lessThan": "4.8", "versionType": "semver"}, {"status": "unaffected", "version": "5.4.287", "versionType": "semver", "lessThanOrEqual": "5.4.*"}, {"status": "unaffected", "version": "5.10.231", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.174", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.120", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.66", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.5", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.13", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["arch/s390/kernel/perf_cpum_sf.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/238e3af849dfdcb1faed544349f7025e533f9aab"}, {"url": "https://git.kernel.org/stable/c/99192c735ed4bfdff0d215ec85c8a87a677cb898"}, {"url": "https://git.kernel.org/stable/c/06a92f810df8037ca36157282ddcbefdcaf049b8"}, {"url": "https://git.kernel.org/stable/c/b5be6a0bb639d165c8418d8dddd8f322587be8be"}, {"url": "https://git.kernel.org/stable/c/a69752f1e5de817941a2ea0609254f6f25acd274"}, {"url": "https://git.kernel.org/stable/c/be54e6e0f93a39a9c00478d70d12956a5f3d5b9b"}, {"url": "https://git.kernel.org/stable/c/a0bd7dacbd51c632b8e2c0500b479af564afadf3"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/cpum_sf: Handle CPU hotplug remove during sampling\n\nCPU hotplug remove handling triggers the following function\ncall sequence:\n\n CPUHP_AP_PERF_S390_SF_ONLINE --> s390_pmu_sf_offline_cpu()\n ...\n CPUHP_AP_PERF_ONLINE --> perf_event_exit_cpu()\n\nThe s390 CPUMF sampling CPU hotplug handler invokes:\n\n s390_pmu_sf_offline_cpu()\n +--> cpusf_pmu_setup()\n +--> setup_pmc_cpu()\n +--> deallocate_buffers()\n\nThis function de-allocates all sampling data buffers (SDBs) allocated\nfor that CPU at event initialization. It also clears the\nPMU_F_RESERVED bit. The CPU is gone and can not be sampled.\n\nWith the event still being active on the removed CPU, the CPU event\nhotplug support in kernel performance subsystem triggers the\nfollowing function calls on the removed CPU:\n\n perf_event_exit_cpu()\n +--> perf_event_exit_cpu_context()\n +--> __perf_event_exit_context()\n\t +--> __perf_remove_from_context()\n\t +--> event_sched_out()\n\t +--> cpumsf_pmu_del()\n\t +--> cpumsf_pmu_stop()\n +--> hw_perf_event_update()\n\nto stop and remove the event. During removal of the event, the\nsampling device driver tries to read out the remaining samples from\nthe sample data buffers (SDBs). But they have already been freed\n(and may have been re-assigned). This may lead to a use after free\nsituation in which case the samples are most likely invalid. In the\nbest case the memory has not been reassigned and still contains\nvalid data.\n\nRemedy this situation and check if the CPU is still in reserved\nstate (bit PMU_F_RESERVED set). In this case the SDBs have not been\nreleased an contain valid data. This is always the case when\nthe event is removed (and no CPU hotplug off occured).\nIf the PMU_F_RESERVED bit is not set, the SDB buffers are gone."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.4.287", "versionStartIncluding": "4.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.231", "versionStartIncluding": "4.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.174", "versionStartIncluding": "4.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.120", "versionStartIncluding": "4.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.66", "versionStartIncluding": "4.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.5", "versionStartIncluding": "4.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.13", "versionStartIncluding": "4.8"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:46:40.129Z"}}}, "cveMetadata": {"cveId": "CVE-2024-57849", "state": "PUBLISHED", "dateUpdated": "2026-10-15T21:51:49.282Z", "dateReserved": "2025-01-11T12:33:33.699Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2025-01-11T14:30:58.365Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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It also clears the\nPMU_F_RESERVED bit. The CPU is gone and can not be sampled.\n\nWith the event still being active on the removed CPU, the CPU event\nhotplug support in kernel performance subsystem triggers the\nfollowing function calls on the removed CPU:\n\n perf_event_exit_cpu()\n +--> perf_event_exit_cpu_context()\n +--> __perf_event_exit_context()\n\t +--> __perf_remove_from_context()\n\t +--> event_sched_out()\n\t +--> cpumsf_pmu_del()\n\t +--> cpumsf_pmu_stop()\n +--> hw_perf_event_update()\n\nto stop and remove the event. During removal of the event, the\nsampling device driver tries to read out the remaining samples from\nthe sample data buffers (SDBs). But they have already been freed\n(and may have been re-assigned). This may lead to a use after free\nsituation in which case the samples are most likely invalid. In the\nbest case the memory has not been reassigned and still contains\nvalid data.\n\nRemedy this situation and check if the CPU is still in reserved\nstate (bit PMU_F_RESERVED set). In this case the SDBs have not been\nreleased an contain valid data. This is always the case when\nthe event is removed (and no CPU hotplug off occured).\nIf the PMU_F_RESERVED bit is not set, the SDB buffers are gone."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: s390/cpum_sf: Controlar la eliminaci\u00f3n de hotplug de la CPU durante el muestreo la gesti\u00f3n de la eliminaci\u00f3n de hotplug de la CPU activa la siguiente secuencia de llamada de funci\u00f3n: CPUHP_AP_PERF_S390_SF_ONLINE --> s390_pmu_sf_offline_cpu() ... CPUHP_AP_PERF_ONLINE --> perf_event_exit_cpu() El controlador de hotplug de la CPU de muestreo s390 CPUMF invoca: s390_pmu_sf_offline_cpu() +--> cpusf_pmu_setup() +--> setup_pmc_cpu() +--> deallocate_buffers() Esta funci\u00f3n anula la asignaci\u00f3n de todos los b\u00faferes de datos de muestreo (SDB) asignados para esa CPU en la inicializaci\u00f3n del evento. Tambi\u00e9n borra el bit PMU_F_RESERVED. La CPU desaparece y no se puede muestrear. Mientras el evento sigue activo en la CPU eliminada, la compatibilidad con hot plug de eventos de CPU en el subsistema de rendimiento del n\u00facleo activa las siguientes llamadas de funci\u00f3n en la CPU eliminada: perf_event_exit_cpu() +--> perf_event_exit_cpu_context() +--> __perf_event_exit_context() +--> __perf_remove_from_context() +--> event_sched_out() +--> cpumsf_pmu_del() +--> cpumsf_pmu_stop() +--> hw_perf_event_update() para detener y eliminar el evento. Durante la eliminaci\u00f3n del evento, el controlador del dispositivo de muestreo intenta leer las muestras restantes de los b\u00faferes de datos de muestra (SDB). Pero ya se han liberado (y es posible que se hayan reasignado). Esto puede provocar una situaci\u00f3n de use after free, en cuyo caso es muy probable que las muestras no sean v\u00e1lidas. En el mejor de los casos, la memoria no se ha reasignado y a\u00fan contiene datos v\u00e1lidos. Solucione esta situaci\u00f3n y compruebe si la CPU sigue en estado reservado (bit PMU_F_RESERVED activado). En este caso, los SDB no se han liberado y contienen datos v\u00e1lidos. Esto siempre ocurre cuando se elimina el evento (y no se ha producido ninguna desconexi\u00f3n en caliente de la CPU). Si el bit PMU_F_RESERVED no est\u00e1 activado, los b\u00faferes SDB desaparecen."}], "id": "CVE-2024-57849", "lastModified": "2026-10-15T22:18:03.393", "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": 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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-57849", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-15T21:41:33.008491Z", "version": "2.0.3"}}]}, "published": "2025-01-11T15:15:07.290", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/06a92f810df8037ca36157282ddcbefdcaf049b8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/238e3af849dfdcb1faed544349f7025e533f9aab"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/99192c735ed4bfdff0d215ec85c8a87a677cb898"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a0bd7dacbd51c632b8e2c0500b479af564afadf3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a69752f1e5de817941a2ea0609254f6f25acd274"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b5be6a0bb639d165c8418d8dddd8f322587be8be"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/be54e6e0f93a39a9c00478d70d12956a5f3d5b9b"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: s390/cpum_sf: Handle CPU hotplug remove during sampling", "id": "2337144", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2337144"}, "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"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ns390/cpum_sf: Handle CPU hotplug remove during sampling\nCPU hotplug remove handling triggers the following function\ncall sequence:\nCPUHP_AP_PERF_S390_SF_ONLINE --> s390_pmu_sf_offline_cpu()\n...\nCPUHP_AP_PERF_ONLINE --> perf_event_exit_cpu()\nThe s390 CPUMF sampling CPU hotplug handler invokes:\ns390_pmu_sf_offline_cpu()\n+--> cpusf_pmu_setup()\n+--> setup_pmc_cpu()\n+--> deallocate_buffers()\nThis function de-allocates all sampling data buffers (SDBs) allocated\nfor that CPU at event initialization. It also clears the\nPMU_F_RESERVED bit. The CPU is gone and can not be sampled.\nWith the event still being active on the removed CPU, the CPU event\nhotplug support in kernel performance subsystem triggers the\nfollowing function calls on the removed CPU:\nperf_event_exit_cpu()\n+--> perf_event_exit_cpu_context()\n+--> __perf_event_exit_context()\n+--> __perf_remove_from_context()\n+--> event_sched_out()\n+--> cpumsf_pmu_del()\n+--> cpumsf_pmu_stop()\n+--> hw_perf_event_update()\nto stop and remove the event. During removal of the event, the\nsampling device driver tries to read out the remaining samples from\nthe sample data buffers (SDBs). But they have already been freed\n(and may have been re-assigned). This may lead to a use after free\nsituation in which case the samples are most likely invalid. In the\nbest case the memory has not been reassigned and still contains\nvalid data.\nRemedy this situation and check if the CPU is still in reserved\nstate (bit PMU_F_RESERVED set). In this case the SDBs have not been\nreleased an contain valid data. This is always the case when\nthe event is removed (and no CPU hotplug off occured).\nIf the PMU_F_RESERVED bit is not set, the SDB buffers are gone.", "A vulnerability was found in the Linux Kernel. This issue affects performance monitoring on the `s390` architecture during specific CPU hotplug scenarios."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2024-57849", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Will not fix", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-01-11T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-57849\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-57849\nhttps://lore.kernel.org/linux-cve-announce/2025011103-CVE-2024-57849-64db@gregkh/T"], "statement": "This vulnerability is marked as Moderate rather than Important because its impact is limited to a specific scenario involving CPU hotplug operations on the `s390` architecture with active performance events. While the issue can lead to a use-after-free condition, the scope of exploitation is constrained since it requires precise timing to interact with deallocated sampling data buffers (SDBs) during event cleanup. Moreover, the invalid memory access primarily affects performance monitoring functionality and does not directly compromise critical system processes or user data.", "threat_severity": "Moderate"}

{"created": "2025-07-13T21:06:47.355064+00:00", "updated": "2025-07-13T21:06:47.355115+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}