{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpib/common/gpib_os.c",
            "drivers/gpib/include/gpib_types.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "cae26eff1b56d78bed7873cf3e60a2b1bdd4da6c",
              "status": "affected",
              "version": "9dde4559e93955ccc47d588f7fd051684d55c4e7",
              "versionType": "git"
            },
            {
              "lessThan": "28c75dd143ead62e0dfac564c79d251e21d5d74b",
              "status": "affected",
              "version": "9dde4559e93955ccc47d588f7fd051684d55c4e7",
              "versionType": "git"
            },
            {
              "lessThan": "d1857f8296dceb75d00ab857fc3c61bc00c7f5c6",
              "status": "affected",
              "version": "9dde4559e93955ccc47d588f7fd051684d55c4e7",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpib/common/gpib_os.c",
            "drivers/gpib/include/gpib_types.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.13"
            },
            {
              "lessThan": "6.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.22",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.22",
                  "versionStartIncluding": "6.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.12",
                  "versionStartIncluding": "6.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "6.13",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngpib: fix use-after-free in IO ioctl handlers\n\nThe IBRD, IBWRT, IBCMD, and IBWAIT ioctl handlers use a gpib_descriptor\npointer after board-\u003ebig_gpib_mutex has been released.  A concurrent\nIBCLOSEDEV ioctl can free the descriptor via close_dev_ioctl() during\nthis window, causing a use-after-free.\n\nThe IO handlers (read_ioctl, write_ioctl, command_ioctl) explicitly\nrelease big_gpib_mutex before calling their handler.  wait_ioctl() is\ncalled with big_gpib_mutex held, but ibwait() releases it internally\nwhen wait_mask is non-zero.  In all four cases, the descriptor pointer\nobtained from handle_to_descriptor() becomes unprotected.\n\nFix this by introducing a kernel-only descriptor_busy reference count\nin struct gpib_descriptor.  Each handler atomically increments\ndescriptor_busy under file_priv-\u003edescriptors_mutex before releasing the\nlock, and decrements it when done.  close_dev_ioctl() checks\ndescriptor_busy under the same lock and rejects the close with -EBUSY\nif the count is non-zero.\n\nA reference count rather than a simple flag is necessary because\nmultiple handlers can operate on the same descriptor concurrently\n(e.g. IBRD and IBWAIT on the same handle from different threads).\n\nA separate counter is needed because io_in_progress can be cleared from\nunprivileged userspace via the IBWAIT ioctl (through general_ibstatus()\nwith set_mask containing CMPL), which would allow an attacker to bypass\na check based solely on io_in_progress.  The new descriptor_busy\ncounter is only modified by the kernel IO paths.\n\nThe lock ordering is consistent (big_gpib_mutex -\u003e descriptors_mutex)\nand the handlers only hold descriptors_mutex briefly during the lookup,\nso there is no deadlock risk and no impact on IO throughput."
        }
      ],
      "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 code is reached through local `/dev/gpibN` character-device ioctls such as `IBRD`, `IBWRT`, `IBCMD`, `IBWAIT`, and `IBCLOSEDEV`. There is no network, adjacent, or physical packet-processing entry point for this bug.\nAC:L - The attacker controls both sides of the race by issuing concurrent ioctls on the same GPIB file descriptor and handle. Use-after-free triggering does not depend on conditions outside attacker control once the board is online and accessible.\nPR:L - The vulnerable ioctls do not perform capability checks; a local user with access to the GPIB device node can open a descriptor, run IO or wait operations, and concurrently close it. Administrative privileges are needed for board configuration, but not for the vulnerable open/close/IO path in a configured deployment.\nUI:N - No victim action is required after the attacker has local access to the device. Exploitation is performed entirely by attacker-controlled ioctl calls.\nS:U - The bug is a kernel use-after-free reachable from a local kernel device interface and impacts the same kernel security authority. It does not cross a virtualization, IOMMU, or separate security-scope boundary.\nC:H - This is a kernel heap use-after-free of `struct gpib_descriptor`, and freed object reuse can expose or help derive kernel memory contents. Following the required kernel guidance, use-after-free bugs are scored as high confidentiality impact.\nI:H - The stale descriptor pointer is dereferenced after free and can be overlapped through heap reuse, giving a plausible path to corrupt kernel data or build write/control-flow primitives. Following the required kernel guidance, use-after-free bugs are scored as high integrity impact.\nA:H - The stale pointer can be dereferenced after `kfree()` during IO or wait completion, making kernel oops, panic, or hang plausible. Use-after-free bugs are therefore high availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:25:02.500Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/cae26eff1b56d78bed7873cf3e60a2b1bdd4da6c"
        },
        {
          "url": "https://git.kernel.org/stable/c/28c75dd143ead62e0dfac564c79d251e21d5d74b"
        },
        {
          "url": "https://git.kernel.org/stable/c/d1857f8296dceb75d00ab857fc3c61bc00c7f5c6"
        }
      ],
      "title": "gpib: fix use-after-free in IO ioctl handlers",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31769",
    "datePublished": "2026-05-01T14:14:58.617Z",
    "dateReserved": "2026-03-09T15:48:24.140Z",
    "dateUpdated": "2026-08-05T12:25:02.500Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}