{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "6460e75a104d10458817d2f5b2fbff775bf0b43a"
            },
            {
              "fixed": "3d74e0654ac908c65a8f20373091826fe43b1363"
            },
            {
              "fixed": "c47ccfb3d80dfed522ca06a5954ac97488d78c5a"
            },
            {
              "fixed": "fe671d3c84ffb1b763d590c25195755adeaadaba"
            },
            {
              "fixed": "c5f4a211e82d04ccc1809311322c47023bbe66e2"
            },
            {
              "fixed": "9676ca7b1ef31a3a65b3e61e7ce3b54ce7364202"
            },
            {
              "fixed": "1afd963fcd963db0dc5d47df6dfcf010c9c4647e"
            },
            {
              "fixed": "feade299e932967de27519338d41de348fb5b061"
            },
            {
              "fixed": "d06a310b45e153872033dd0cf19d5a2279121099"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.19"
            },
            {
              "fixed": "5.10.258"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.209"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.175"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.141"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.91"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.33"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53304.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: sg: Resolve soft lockup issue when opening /dev/sgX\n\nThe parameter def_reserved_size defines the default buffer size reserved\nfor each Sg_fd and should be restricted to a range between 0 and 1,048,576\n(see https://tldp.org/HOWTO/SCSI-Generic-HOWTO/proc.html).  Although the\nfunction sg_proc_write_dressz enforces this limit, it is possible to bypass\nit by directly modifying the module parameter as shown below, which then\ncauses a soft lockup:\n\necho -1 \u003e /sys/module/sg/parameters/def_reserved_size\nexec 4\u003c\u003e /dev/sg0\n\nwatchdog: BUG: soft lockup - CPU#5 stuck for 26 seconds! [bash:537]\nModules loaded:\nCPU: 5 UID: 0 PID: 537 Command: bash, kernel version 6.19.0-rc3+ #134,\nPREEMPT disabled\nHardware: QEMU Standard PC (i440FX + PIIX, 1996), BIOS version\n1.16.1-2.fc37 dated 04/01/2014\n...\nCall Trace:\n\n  sg_build_reserve+0x5c/0xa0\n  sg_add_sfp+0x168/0x270\n  sg_open+0x16e/0x340\n  chrdev_open+0xbe/0x230\n  do_dentry_open+0x175/0x480\n  vfs_open+0x34/0xf0\n  do_open+0x265/0x3d0\n  path_openat+0x110/0x290\n  do_filp_open+0xc3/0x170\n  do_sys_openat2+0x71/0xe0\n  __x64_sys_openat+0x6d/0xa0\n  do_syscall_64+0x62/0x310\n  entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nThe fix is to use module_param_cb to validate and reject invalid values\nassigned to def_reserved_size.",
  "id": "CVE-2026-53304",
  "modified": "2026-07-08T05:39:10.920664981Z",
  "published": "2026-06-26T19:41:00.056Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1afd963fcd963db0dc5d47df6dfcf010c9c4647e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3d74e0654ac908c65a8f20373091826fe43b1363"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9676ca7b1ef31a3a65b3e61e7ce3b54ce7364202"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c47ccfb3d80dfed522ca06a5954ac97488d78c5a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c5f4a211e82d04ccc1809311322c47023bbe66e2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d06a310b45e153872033dd0cf19d5a2279121099"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fe671d3c84ffb1b763d590c25195755adeaadaba"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/feade299e932967de27519338d41de348fb5b061"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53304.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53304"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "summary": "scsi: sg: Resolve soft lockup issue when opening /dev/sgX"
}