CVE-2024-56624 (GCVE-0-2024-56624)

Vulnerability from cvelistv5 – Published: 2024-12-27 14:51 – Updated: 2026-08-05 11:45
VLAI
Title
iommufd: Fix out_fput in iommufd_fault_alloc()
Summary
In the Linux kernel, the following vulnerability has been resolved: iommufd: Fix out_fput in iommufd_fault_alloc() As fput() calls the file->f_op->release op, where fault obj and ictx are getting released, there is no need to release these two after fput() one more time, which would result in imbalanced refcounts: refcount_t: decrement hit 0; leaking memory. WARNING: CPU: 48 PID: 2369 at lib/refcount.c:31 refcount_warn_saturate+0x60/0x230 Call trace: refcount_warn_saturate+0x60/0x230 (P) refcount_warn_saturate+0x60/0x230 (L) iommufd_fault_fops_release+0x9c/0xe0 [iommufd] ... VFS: Close: file count is 0 (f_op=iommufd_fops [iommufd]) WARNING: CPU: 48 PID: 2369 at fs/open.c:1507 filp_flush+0x3c/0xf0 Call trace: filp_flush+0x3c/0xf0 (P) filp_flush+0x3c/0xf0 (L) __arm64_sys_close+0x34/0x98 ... imbalanced put on file reference count WARNING: CPU: 48 PID: 2369 at fs/file.c:74 __file_ref_put+0x100/0x138 Call trace: __file_ref_put+0x100/0x138 (P) __file_ref_put+0x100/0x138 (L) __fput_sync+0x4c/0xd0 Drop those two lines to fix the warnings above.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 07838f7fd529c8a6de44b601d4b7057e6c8d36ed , < 2b3f30c8edbf9a122ce01f13f0f41fbca5f1d41d (git)
Affected: 07838f7fd529c8a6de44b601d4b7057e6c8d36ed , < af7f4780514f850322b2959032ecaa96e4b26472 (git)
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Linux Linux Affected: 6.11
Unaffected: 0 , < 6.11 (semver)
Unaffected: 6.12.5 , ≤ 6.12.* (semver)
Unaffected: 6.13 , ≤ * (original_commit_for_fix)
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          "product": "Linux",
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          "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-\u003ef_op-\u003erelease 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."
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              "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\u0027s 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."
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          "url": "https://git.kernel.org/stable/c/af7f4780514f850322b2959032ecaa96e4b26472"
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    "cveId": "CVE-2024-56624",
    "datePublished": "2024-12-27T14:51:27.318Z",
    "dateReserved": "2024-12-27T14:03:06.017Z",
    "dateUpdated": "2026-08-05T11:45:30.290Z",
    "state": "PUBLISHED"
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            "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-\u003ef_op-\u003erelease 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-\u0026gt;f_op-\u0026gt;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": "2026-08-04T11:22:14.573",
        "metrics": {
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              "cvssData": {
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                "attackVector": "LOCAL",
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                "value": "CWE-401"
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            "type": "Primary"
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-04T22:39:26+00:00",
      "cve": "CVE-2024-56624",
      "id": "CVE-2024-56624",
      "initial_release_date": "2024-12-27T00:00:00+00:00",
      "product_status:known_affected": "108",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: iommufd: Fix out_fput in iommufd_fault_alloc()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-56624.json",
      "version": "3"
    }
  }
}



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