scsi: sg: Resolve soft lockup issue when opening /dev/sgX

{
  "id": "aa3e45ec88f767ec05e3070362c64890920cf1c3aca35dbf8f00cfcc8e0e9aec",
  "url": "https://osv.dev/vulnerability/CVE-2026-53304",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "scsi: sg: Resolve soft lockup issue when opening /dev/sgX",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: scsi: sg: Resolve soft lockup issue when opening /dev/sgX The parameter def_reserved_size defines the default buffer size reserved for each Sg_fd and should be restricted to a range between 0 and 1,048,576 (see https://tldp.org/HOWTO/SCSI-Generic-HOWTO/proc.html). Although the function sg_proc_write_dressz enforces this limit, it is possible to bypass it by directly modifying the module parameter as shown below, which then causes a soft lockup: echo -1 > /sys/module/sg/parameters/def_reserved_size exec 4<> /dev/sg0 watchdog: BUG: soft lockup - CPU#5 stuck for 26 seconds! [bash:537] Modules loaded: CPU: 5 UID: 0 PID: 537 Command: bash, kernel version 6.19.0-rc3+ #134, PREEMPT disabled Hardware: QEMU Standard PC (i440FX + PIIX, 1996), BIOS version 1.16.1-2.fc37 dated 04/01/2014 ... Call Trace: sg_build_reserve+0x5c/0xa0 sg_add_sfp+0x168/0x270 sg_open+0x16e/0x340 chrdev_open+0xbe/0x230 do_dentry_open+0x175/0x480 vfs_open+0x34/0xf0 do_open+0x265/0x3d0 path_openat+0x110/0x290 do_filp_open+0xc3/0x170 do_sys_openat2+0x71/0xe0 __x64_sys_openat+0x6d/0xa0 do_syscall_64+0x62/0x310 entry_SYSCALL_64_after_hwframe+0x76/0x7e The fix is to use module_param_cb to validate and reject invalid values assigned to def_reserved_size.",
    "evidence": "osv:CVE-2026-53304",
    "products": [
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        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-53304",
      "aliases": [
        "CVE-2026-53304"
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      ],
      "modified": "2026-10-28T02:30:42.802927224Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1afd963fcd963db0dc5d47df6dfcf010c9c4647e",
        "https://git.kernel.org/stable/c/3d74e0654ac908c65a8f20373091826fe43b1363",
        "https://git.kernel.org/stable/c/9676ca7b1ef31a3a65b3e61e7ce3b54ce7364202",
        "https://git.kernel.org/stable/c/c47ccfb3d80dfed522ca06a5954ac97488d78c5a",
        "https://git.kernel.org/stable/c/c5f4a211e82d04ccc1809311322c47023bbe66e2",
        "https://git.kernel.org/stable/c/d06a310b45e153872033dd0cf19d5a2279121099",
        "https://git.kernel.org/stable/c/fe671d3c84ffb1b763d590c25195755adeaadaba",
        "https://git.kernel.org/stable/c/feade299e932967de27519338d41de348fb5b061",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53304.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-53304",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53304.json"
      }
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    "related_cves": [
      {
        "value": "CVE-2026-53304",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 510246,
  "published_at": "2026-06-26T19:41:00.056+00:00"
}