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

Vulnerability from cvelistv5 – Published: 2024-12-27 14:51 – Updated: 2026-10-15 21:41
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
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-15 21:41 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6642 records in the last 180 days details
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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Show details on NVD website
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                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "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-\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."
            }
          ],
          "metrics": [
            {
              "cvssV3_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",
                "version": "3.1"
              },
              "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\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."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T11:45:30.290Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "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"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-56624",
        "datePublished": "2024-12-27T14:51:27.318Z",
        "dateReserved": "2024-12-27T14:03:06.017Z",
        "dateUpdated": "2026-10-15T21:41:47.207Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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