CVE-2024-56624

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2024-56624", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-12-27T14:03:06.017Z", "datePublished": "2024-12-27T14:51:27.318Z", "dateUpdated": "2026-10-15T21:41:47.207Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:45:30.290Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommufd: Fix out_fput in iommufd_fault_alloc()\n\nAs fput() calls the file->f_op->release op, where fault obj and ictx are\ngetting released, there is no need to release these two after fput() one\nmore time, which would result in imbalanced refcounts:\n refcount_t: decrement hit 0; leaking memory.\n WARNING: CPU: 48 PID: 2369 at lib/refcount.c:31 refcount_warn_saturate+0x60/0x230\n Call trace:\n refcount_warn_saturate+0x60/0x230 (P)\n refcount_warn_saturate+0x60/0x230 (L)\n iommufd_fault_fops_release+0x9c/0xe0 [iommufd]\n ...\n VFS: Close: file count is 0 (f_op=iommufd_fops [iommufd])\n WARNING: CPU: 48 PID: 2369 at fs/open.c:1507 filp_flush+0x3c/0xf0\n Call trace:\n filp_flush+0x3c/0xf0 (P)\n filp_flush+0x3c/0xf0 (L)\n __arm64_sys_close+0x34/0x98\n ...\n imbalanced put on file reference count\n WARNING: CPU: 48 PID: 2369 at fs/file.c:74 __file_ref_put+0x100/0x138\n Call trace:\n __file_ref_put+0x100/0x138 (P)\n __file_ref_put+0x100/0x138 (L)\n __fput_sync+0x4c/0xd0\n\nDrop those two lines to fix the warnings above."}], "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 - Triggered via the IOMMU_FAULT_QUEUE_ALLOC ioctl on the local device file /dev/iommu (or /dev/vfio/vfio); no network reachability.\nAC:L - The caller reliably forces the error path (e.g. exhausting RLIMIT_NOFILE so get_unused_fd_flags fails, or passing a bad user pointer to fail iommufd_ucmd_respond); no uncontrolled race or memory-layout precondition.\nPR:L - Only a basic unprivileged local user with access to the iommufd/vfio device node is needed (/dev/vfio/vfio is mode 0666 with CONFIG_IOMMUFD_VFIO_CONTAINER); no capability or root required, and no device must be attached.\nUI:N - The ioctl is issued directly by the attacker; no action by any other user is required.\nS:U - The corruption stays within the kernel's own security authority; it is a refcount/UAF bug, not an IOMMU-translation or VM boundary bypass.\nC:H - The double put underflows a struct file refcount and the fault object is freed while still referenced, a use-after-free whose freed-object contents the attacker can control to read arbitrary kernel memory.\nI:H - The use-after-free / refcount underflow on a struct file enables heap grooming and arbitrary-write primitives, potentially leading to privilege escalation.\nA:H - The imbalanced refcounts cause premature frees and warnings that reliably lead to kernel oops/panic on any triggering invocation."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/iommu/iommufd/fault.c"], "versions": [{"version": "07838f7fd529c8a6de44b601d4b7057e6c8d36ed", "lessThan": "2b3f30c8edbf9a122ce01f13f0f41fbca5f1d41d", "status": "affected", "versionType": "git"}, {"version": "07838f7fd529c8a6de44b601d4b7057e6c8d36ed", "lessThan": "af7f4780514f850322b2959032ecaa96e4b26472", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/iommu/iommufd/fault.c"], "versions": [{"version": "6.11", "status": "affected"}, {"version": "0", "lessThan": "6.11", "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": "6.11", "versionEndExcluding": "6.12.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "6.13"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/2b3f30c8edbf9a122ce01f13f0f41fbca5f1d41d"}, {"url": "https://git.kernel.org/stable/c/af7f4780514f850322b2959032ecaa96e4b26472"}], "title": "iommufd: Fix out_fput in iommufd_fault_alloc()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-56624", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-15T21:41:07.307658Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T21:41:47.207Z"}}]}}

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no uncontrolled race or memory-layout precondition.\nPR:L - Only a basic unprivileged local user with access to the iommufd/vfio device node is needed (/dev/vfio/vfio is mode 0666 with CONFIG_IOMMUFD_VFIO_CONTAINER); no capability or root required, and no device must be attached.\nUI:N - The ioctl is issued directly by the attacker; no action by any other user is required.\nS:U - The corruption stays within the kernel's own security authority; it is a refcount/UAF bug, not an IOMMU-translation or VM boundary bypass.\nC:H - The double put underflows a struct file refcount and the fault object is freed while still referenced, a use-after-free whose freed-object contents the attacker can control to read arbitrary kernel memory.\nI:H - The use-after-free / refcount underflow on a struct file enables heap grooming and arbitrary-write primitives, potentially leading to privilege escalation.\nA:H - The imbalanced refcounts cause premature frees and warnings that reliably lead to kernel oops/panic on any triggering invocation."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "07838f7fd529c8a6de44b601d4b7057e6c8d36ed", "lessThan": "2b3f30c8edbf9a122ce01f13f0f41fbca5f1d41d", "versionType": "git"}, {"status": "affected", "version": "07838f7fd529c8a6de44b601d4b7057e6c8d36ed", "lessThan": "af7f4780514f850322b2959032ecaa96e4b26472", "versionType": "git"}], "programFiles": ["drivers/iommu/iommufd/fault.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.11"}, {"status": "unaffected", "version": "0", "lessThan": "6.11", "versionType": "semver"}, {"status": "unaffected", "version": "6.12.5", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.13", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/iommu/iommufd/fault.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/2b3f30c8edbf9a122ce01f13f0f41fbca5f1d41d"}, {"url": "https://git.kernel.org/stable/c/af7f4780514f850322b2959032ecaa96e4b26472"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommufd: Fix out_fput in iommufd_fault_alloc()\n\nAs fput() calls the file->f_op->release op, where fault obj and ictx are\ngetting released, there is no need to release these two after fput() one\nmore time, which would result in imbalanced refcounts:\n refcount_t: decrement hit 0; leaking memory.\n WARNING: CPU: 48 PID: 2369 at lib/refcount.c:31 refcount_warn_saturate+0x60/0x230\n Call trace:\n refcount_warn_saturate+0x60/0x230 (P)\n refcount_warn_saturate+0x60/0x230 (L)\n iommufd_fault_fops_release+0x9c/0xe0 [iommufd]\n ...\n VFS: Close: file count is 0 (f_op=iommufd_fops [iommufd])\n WARNING: CPU: 48 PID: 2369 at fs/open.c:1507 filp_flush+0x3c/0xf0\n Call trace:\n filp_flush+0x3c/0xf0 (P)\n filp_flush+0x3c/0xf0 (L)\n __arm64_sys_close+0x34/0x98\n ...\n imbalanced put on file reference count\n WARNING: CPU: 48 PID: 2369 at fs/file.c:74 __file_ref_put+0x100/0x138\n Call trace:\n __file_ref_put+0x100/0x138 (P)\n __file_ref_put+0x100/0x138 (L)\n __fput_sync+0x4c/0xd0\n\nDrop those two lines to fix the warnings above."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.5", "versionStartIncluding": "6.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.13", "versionStartIncluding": "6.11"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:45:30.290Z"}}}, "cveMetadata": {"cveId": "CVE-2024-56624", "state": "PUBLISHED", "dateUpdated": "2026-10-15T21:41:47.207Z", "dateReserved": "2024-12-27T14:03:06.017Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-12-27T14:51:27.318Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/iommu/iommufd/fault.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "2b3f30c8edbf9a122ce01f13f0f41fbca5f1d41d", "status": "affected", "version": "07838f7fd529c8a6de44b601d4b7057e6c8d36ed", "versionType": "git"}, {"lessThan": "af7f4780514f850322b2959032ecaa96e4b26472", "status": "affected", "version": "07838f7fd529c8a6de44b601d4b7057e6c8d36ed", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/iommu/iommufd/fault.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.11"}, {"lessThan": "6.11", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.5", "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": "80D95899-614A-43BE-AD21-BA14E811ACC4", "versionEndExcluding": "6.12.5", "versionStartIncluding": "6.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*", "matchCriteriaId": "62567B3C-6CEE-46D0-BC2E-B3717FBF7D13", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommufd: Fix out_fput in iommufd_fault_alloc()\n\nAs fput() calls the file->f_op->release op, where fault obj and ictx are\ngetting released, there is no need to release these two after fput() one\nmore time, which would result in imbalanced refcounts:\n refcount_t: decrement hit 0; leaking memory.\n WARNING: CPU: 48 PID: 2369 at lib/refcount.c:31 refcount_warn_saturate+0x60/0x230\n Call trace:\n refcount_warn_saturate+0x60/0x230 (P)\n refcount_warn_saturate+0x60/0x230 (L)\n iommufd_fault_fops_release+0x9c/0xe0 [iommufd]\n ...\n VFS: Close: file count is 0 (f_op=iommufd_fops [iommufd])\n WARNING: CPU: 48 PID: 2369 at fs/open.c:1507 filp_flush+0x3c/0xf0\n Call trace:\n filp_flush+0x3c/0xf0 (P)\n filp_flush+0x3c/0xf0 (L)\n __arm64_sys_close+0x34/0x98\n ...\n imbalanced put on file reference count\n WARNING: CPU: 48 PID: 2369 at fs/file.c:74 __file_ref_put+0x100/0x138\n Call trace:\n __file_ref_put+0x100/0x138 (P)\n __file_ref_put+0x100/0x138 (L)\n __fput_sync+0x4c/0xd0\n\nDrop those two lines to fix the warnings above."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: iommufd: Arreglar out_fput en iommufd_fault_alloc() Como fput() llama a la operaci\u00f3n file->f_op->release, donde se liberan los objetos de falla y ictx, no hay necesidad de liberar estos dos despu\u00e9s de fput() una vez m\u00e1s, lo que dar\u00eda como resultado recuentos de referencias desequilibrados: refcount_t: el decremento llega a 0; p\u00e9rdida de memoria. ADVERTENCIA: CPU: 48 PID: 2369 en lib/refcount.c:31 refcount_warn_saturate+0x60/0x230 Rastreo de llamadas: refcount_warn_saturate+0x60/0x230 (P) refcount_warn_saturate+0x60/0x230 (L) iommufd_fault_fops_release+0x9c/0xe0 [iommufd] ... VFS: Cerrar: el recuento de archivos es 0 (f_op=iommufd_fops [iommufd]) ADVERTENCIA: CPU: 48 PID: 2369 en fs/open.c:1507 filp_flush+0x3c/0xf0 Rastreo de llamadas: filp_flush+0x3c/0xf0 (P) filp_flush+0x3c/0xf0 (L) __arm64_sys_close+0x34/0x98 ... desequilibrado en el recuento de referencias de archivo ADVERTENCIA: CPU: 48 PID: 2369 en fs/file.c:74 __file_ref_put+0x100/0x138 Rastreo de llamadas: __file_ref_put+0x100/0x138 (P) __file_ref_put+0x100/0x138 (L) __fput_sync+0x4c/0xd0 Omita esas dos l\u00edneas para corregir las advertencias anteriores."}], "id": "CVE-2024-56624", "lastModified": "2026-10-15T22:18:01.677", "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": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-56624", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-15T21:41:07.307658Z", "version": "2.0.3"}}]}, "published": "2024-12-27T15:15:21.933", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2b3f30c8edbf9a122ce01f13f0f41fbca5f1d41d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/af7f4780514f850322b2959032ecaa96e4b26472"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: iommufd: Fix out_fput in iommufd_fault_alloc()", "id": "2334443", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2334443"}, "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-20", "details": ["In the Linux kernel, the following vulnerability has been resolved:\niommufd: Fix out_fput in iommufd_fault_alloc()\nAs fput() calls the file->f_op->release op, where fault obj and ictx are\ngetting released, there is no need to release these two after fput() one\nmore time, which would result in imbalanced refcounts:\nrefcount_t: decrement hit 0; leaking memory.\nWARNING: CPU: 48 PID: 2369 at lib/refcount.c:31 refcount_warn_saturate+0x60/0x230\nCall trace:\nrefcount_warn_saturate+0x60/0x230 (P)\nrefcount_warn_saturate+0x60/0x230 (L)\niommufd_fault_fops_release+0x9c/0xe0 [iommufd]\n...\nVFS: Close: file count is 0 (f_op=iommufd_fops [iommufd])\nWARNING: CPU: 48 PID: 2369 at fs/open.c:1507 filp_flush+0x3c/0xf0\nCall trace:\nfilp_flush+0x3c/0xf0 (P)\nfilp_flush+0x3c/0xf0 (L)\n__arm64_sys_close+0x34/0x98\n...\nimbalanced put on file reference count\nWARNING: CPU: 48 PID: 2369 at fs/file.c:74 __file_ref_put+0x100/0x138\nCall trace:\n__file_ref_put+0x100/0x138 (P)\n__file_ref_put+0x100/0x138 (L)\n__fput_sync+0x4c/0xd0\nDrop those two lines to fix the warnings above."], "name": "CVE-2024-56624", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-12-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-56624\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-56624\nhttps://lore.kernel.org/linux-cve-announce/2024122711-CVE-2024-56624-35f7@gregkh/T"], "threat_severity": "Low"}

{"created": "2025-07-13T11:21:48.930606+00:00", "updated": "2025-07-13T11:21:48.930664+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}