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              "value": "AV:L - The attacker-controlled `*cmd` value originates from a local write to the UCSI debugfs `command` file on the local system, not from any network or remote peer input. No physical access is required to issue the malformed command itself.\nAC:L - The index is taken verbatim from bits 24-31 of the value the attacker writes, so the out-of-bounds access is deterministic and repeatable with no race or memory-layout guessing. The `has_multiple_dp` precondition is under the attacker\u0027s own control since a local attacker can attach a Type-C partner advertising multiple DP alternate modes.\nPR:L - Reaching the code requires write access to the UCSI debugfs interface, which is an authenticated local account with access to the debugfs mount rather than any remote or unauthenticated position. Consistent with prior kernel.org scoring of debugfs-reachable overflows, this is treated as low privilege rather than high.\nUI:N - The attacker triggers the flaw entirely on their own by writing the crafted UCSI command; no separate victim needs to open a file, mount a filesystem, or take any other action. Establishing the multi-DP connector state is an action the attacker performs themselves, not a victim.\nS:U - The out-of-bounds access corrupts kernel heap memory within the same kernel security authority. No hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - `new_port-\u003elinked_idx` and `new_port-\u003esvid` are read from an attacker-selected offset ranging up to roughly 2 KB past the end of the `updated[]` array and past the containing `struct ucsi_ccg` allocation, so this is a wide-ranging heap out-of-bounds read rather than a tightly bounded one. The disclosed bytes steer subsequent control flow and the command value programmed into the PD controller, and such heap OOB reads are leverageable for broader kernel memory disclosure.\nI:H - When the out-of-bounds `linked_idx` reads as `0xff` and the ENTER bit is set, `new_port-\u003eactive_idx = cam` performs a one-byte out-of-bounds heap write at the attacker-chosen offset, giving a controlled-location heap corruption primitive. Out-of-bounds writes into adjacent slab objects are exploitable for control-flow hijacking, and the corrupted value also alters the command sent to the Type-C PD controller.\nA:H - Reading and writing thousands of bytes beyond a `devm`-allocated object corrupts neighbouring slab objects or touches unmapped memory, producing slab corruption, KASAN reports, and kernel oops/panic. The attacker can repeat the write with different offsets until the system crashes."
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetlink: terminate outstanding dump on socket close\n\nNetlink supports iterative dumping of data. It provides the families\nthe following ops:\n - start - (optional) kicks off the dumping process\n - dump  - actual dump helper, keeps getting called until it returns 0\n - done  - (optional) pairs with .start, can be used for cleanup\nThe whole process is asynchronous and the repeated calls to .dump\ndon\u0027t actually happen in a tight loop, but rather are triggered\nin response to recvmsg() on the socket.\n\nThis gives the user full control over the dump, but also means that\nthe user can close the socket without getting to the end of the dump.\nTo make sure .start is always paired with .done we check if there\nis an ongoing dump before freeing the socket, and if so call .done.\n\nThe complication is that sockets can get freed from BH and .done\nis allowed to sleep. So we use a workqueue to defer the call, when\nneeded.\n\nUnfortunately this does not work correctly. What we defer is not\nthe cleanup but rather releasing a reference on the socket.\nWe have no guarantee that we own the last reference, if someone\nelse holds the socket they may release it in BH and we\u0027re back\nto square one.\n\nThe whole dance, however, appears to be unnecessary. Only the user\ncan interact with dumps, so we can clean up when socket is closed.\nAnd close always happens in process context. Some async code may\nstill access the socket after close, queue notification skbs to it etc.\nbut no dumps can start, end or otherwise make progress.\n\nDelete the workqueue and flush the dump state directly from the release\nhandler. Note that further cleanup is possible in -next, for instance\nwe now always call .done before releasing the main module reference,\nso dump doesn\u0027t have to take a reference of its own."
        }
      ],
      "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 - The vulnerable path is reached entirely through local syscalls \u2014 opening an AF_NETLINK socket, starting a dump, and registering it via mq_notify \u2014 with no network component.\nAC:L - Although triggering requires winning a lifetime race, the local attacker controls both sides (the outstanding dump, the extra reference holder via mqueue, and the socket close/reference drop) and syzkaller reproduced it, so success is reliable.\nPR:L - All required operations (AF_NETLINK socket, netlink dump, POSIX mqueue notification via mq_notify) are available to an ordinary unprivileged local user with no capabilities in the init namespace.\nUI:N - The attacker performs every step (start dump, attach reference, close socket) themselves; no victim action is required.\nS:U - The corruption stays within the kernel\u0027s own security authority; there is no VM/IOMMU/sandbox boundary crossed.\nC:H - The mismanaged socket reference lifetime is characterized as a use-after-free of a heap-allocated netlink_sock object, whose freed-then-reallocated contents an attacker can leverage to read sensitive kernel memory.\nI:H - The same use-after-free permits heap grooming and writes through a reallocated object, enabling memory corruption and potential control-flow hijacking.\nA:H - Executing the sleeping .done callback in atomic/BH context and the use-after-free reliably produce a kernel BUG/oops, deadlock, or panic."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:44:03.721Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/114a61d8d94ae3a43b82446cf737fd757021b834"
        },
        {
          "url": "https://git.kernel.org/stable/c/598c956b62699c3753929602560d8df322e60559"
        },
        {
          "url": "https://git.kernel.org/stable/c/6e3f2c512d2b7dbd247485b1dd9e43e4210a18f4"
        },
        {
          "url": "https://git.kernel.org/stable/c/d2fab3d66cc16cfb9e3ea1772abe6b79b71fa603"
        },
        {
          "url": "https://git.kernel.org/stable/c/4e87a52133284afbd40fb522dbf96e258af52a98"
        },
        {
          "url": "https://git.kernel.org/stable/c/bbc769d2fa1b8b368c5fbe013b5b096afa3c05ca"
        },
        {
          "url": "https://git.kernel.org/stable/c/176c41b3ca9281a9736b67c6121b03dbf0c8c08f"
        },
        {
          "url": "https://git.kernel.org/stable/c/1904fb9ebf911441f90a68e96b22aa73e4410505"
        }
      ],
      "title": "netlink: terminate outstanding dump on socket close",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-53140",
    "datePublished": "2024-12-04T14:20:44.914Z",
    "dateReserved": "2024-11-19T17:17:24.997Z",
    "dateUpdated": "2026-08-05T11:44:03.721Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}