CVE-2024-56706

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There is no remote or adjacent-network path to the CPU-measurement sampling facility.\nAC:L - The attacker controls both sides of the race by simply calling `perf_event_open()` from two or more of its own threads in a loop; `perf_try_init_event()` holds no global lock, and the race window spans a long `GFP_KERNEL` page-allocation loop (hundreds to thousands of pages, freely sleeping), making it trivially winnable.\nPR:L - Under the upstream default `perf_event_paranoid = 2`, an ordinary unprivileged user may open a per-task sampling event (`pid=self`, `cpu=-1`, `exclude_kernel=1`) with no capability at all, and that `cpu == -1` branch is precisely the one that allocates buffers on every online CPU. A local account is required, so not PR:N.\nUI:N - The attacking process triggers the race entirely on its own by issuing concurrent syscalls; no action by any other user or victim process is needed.\nS:U - The corruption is confined to kernel memory managed by the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The racing `free_sampling_buffer()` treats still-zero SDBT entries as SDB pointers and walks past the end of the table page, reading unbounded adjacent kernel memory as physical addresses; combined with the resulting use-after-free, the hardware keeps writing sample data into freed/reallocated pages that the attacker reads back through the perf ring buffer.\nI:H - The race yields double-free, use-after-free writes into freed SDBT/SDB pages, and `free_page()` on in-use pages (including physical page 0 via `phys_to_virt(0)`), all classic page-allocator grooming primitives that can be escalated to arbitrary write and control-flow hijack.\nA:H - At minimum each won race orphans an entire SDBT/SDB chain (up to ~32 MB per online CPU) and can be repeated in a loop to exhaust memory; the double-free and freeing of live kernel pages readily produce a page-allocator BUG 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": "8a6fe8f21ec4f049a7b1fe120ad50a5065a9c7a8", "lessThan": "4b3bdfa89635db6a53e02955548bd07bebcae233", "status": "affected", "versionType": "git"}, {"version": "8a6fe8f21ec4f049a7b1fe120ad50a5065a9c7a8", "lessThan": "f55bd479d8663a4a4e403b3d308d3d1aa33d92df", "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": "6.12", "status": "affected"}, {"version": "0", "lessThan": "6.12", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.2", "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": "6.12", "versionEndExcluding": "6.12.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.13"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/4b3bdfa89635db6a53e02955548bd07bebcae233"}, {"url": "https://git.kernel.org/stable/c/f55bd479d8663a4a4e403b3d308d3d1aa33d92df"}], "title": "s390/cpum_sf: Fix and protect memory allocation of SDBs with mutex", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["arch/s390/kernel/perf_cpum_sf.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "4b3bdfa89635db6a53e02955548bd07bebcae233", "status": "affected", "version": "8a6fe8f21ec4f049a7b1fe120ad50a5065a9c7a8", "versionType": "git"}, {"lessThan": "f55bd479d8663a4a4e403b3d308d3d1aa33d92df", "status": "affected", "version": "8a6fe8f21ec4f049a7b1fe120ad50a5065a9c7a8", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["arch/s390/kernel/perf_cpum_sf.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.12"}, {"lessThan": "6.12", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.2", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.13", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "D8882B1B-2ABC-4838-AC1D-DBDBB5764776", "versionEndExcluding": "6.12.2", "versionStartIncluding": "6.12", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/cpum_sf: Fix and protect memory allocation of SDBs with mutex\n\nReservation of the PMU hardware is done at first event creation\nand is protected by a pair of mutex_lock() and mutex_unlock().\nAfter reservation of the PMU hardware the memory\nrequired for the PMUs the event is to be installed on is\nallocated by allocate_buffers() and alloc_sampling_buffer().\nThis done outside of the mutex protection.\nWithout mutex protection two or more concurrent invocations of\nperf_event_init() may run in parallel.\nThis can lead to allocation of Sample Data Blocks (SDBs)\nmultiple times for the same PMU.\nPrevent this and protect memory allocation of SDBs by\nmutex."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: s390/cpum_sf: Reparar y proteger la asignaci\u00f3n de memoria de los SDB con mutex La reserva del hardware de la PMU se realiza en la primera creaci\u00f3n del evento y est\u00e1 protegida por un par de mutex_lock() y mutex_unlock(). Despu\u00e9s de la reserva del hardware de la PMU, la memoria requerida para las PMU en las que se instalar\u00e1 el evento se asigna mediante allocate_buffers() y alloc_sampling_buffer(). Esto se hace fuera de la protecci\u00f3n mutex. Sin la protecci\u00f3n mutex, dos o m\u00e1s invocaciones simult\u00e1neas de perf_event_init() pueden ejecutarse en paralelo. Esto puede provocar la asignaci\u00f3n de bloques de datos de muestra (SDB) varias veces para la misma PMU. Evite esto y proteja la asignaci\u00f3n de memoria de los SDB mediante mutex."}], "id": "CVE-2024-56706", "lastModified": "2026-08-04T11:22:23.160", "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": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 6.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 5.2, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2024-12-28T10:15:19.400", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4b3bdfa89635db6a53e02955548bd07bebcae233"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f55bd479d8663a4a4e403b3d308d3d1aa33d92df"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}, {"lang": "en", "value": "CWE-362"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: s390/cpum_sf: Fix and protect memory allocation of SDBs with mutex", "id": "2334662", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2334662"}, "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:\ns390/cpum_sf: Fix and protect memory allocation of SDBs with mutex\nReservation of the PMU hardware is done at first event creation\nand is protected by a pair of mutex_lock() and mutex_unlock().\nAfter reservation of the PMU hardware the memory\nrequired for the PMUs the event is to be installed on is\nallocated by allocate_buffers() and alloc_sampling_buffer().\nThis done outside of the mutex protection.\nWithout mutex protection two or more concurrent invocations of\nperf_event_init() may run in parallel.\nThis can lead to allocation of Sample Data Blocks (SDBs)\nmultiple times for the same PMU.\nPrevent this and protect memory allocation of SDBs by\nmutex."], "name": "CVE-2024-56706", "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": "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": "2024-12-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-56706\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-56706\nhttps://lore.kernel.org/linux-cve-announce/2024122838-CVE-2024-56706-d292@gregkh/T"], "threat_severity": "Low"}

{"created": "2025-07-12T16:01:21.892603+00:00", "updated": "2025-07-12T16:01:21.892652+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}