Vulnerability-Lookup

CVE-2026-53304 (GCVE-0-2026-53304)

Vulnerability from cvelistv5 – Published: 2026-06-26 19:41 – Updated: 2026-06-26 19:41

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.

Severity

No CVSS data available.

Assigner

Linux

References

8 references

URL	Tags
https://git.kernel.org/stable/c/3d74e0654ac908c65…
https://git.kernel.org/stable/c/c47ccfb3d80dfed52…
https://git.kernel.org/stable/c/fe671d3c84ffb1b76…
https://git.kernel.org/stable/c/c5f4a211e82d04ccc…
https://git.kernel.org/stable/c/9676ca7b1ef31a3a6…
https://git.kernel.org/stable/c/1afd963fcd963db0d…
https://git.kernel.org/stable/c/feade299e932967de…
https://git.kernel.org/stable/c/d06a310b45e153872…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 6460e75a104d10458817d2f5b2fbff775bf0b43a , < 3d74e0654ac908c65a8f20373091826fe43b1363 (git) Affected: 6460e75a104d10458817d2f5b2fbff775bf0b43a , < c47ccfb3d80dfed522ca06a5954ac97488d78c5a (git) Affected: 6460e75a104d10458817d2f5b2fbff775bf0b43a , < fe671d3c84ffb1b763d590c25195755adeaadaba (git) Affected: 6460e75a104d10458817d2f5b2fbff775bf0b43a , < c5f4a211e82d04ccc1809311322c47023bbe66e2 (git) Affected: 6460e75a104d10458817d2f5b2fbff775bf0b43a , < 9676ca7b1ef31a3a65b3e61e7ce3b54ce7364202 (git) Affected: 6460e75a104d10458817d2f5b2fbff775bf0b43a , < 1afd963fcd963db0dc5d47df6dfcf010c9c4647e (git) Affected: 6460e75a104d10458817d2f5b2fbff775bf0b43a , < feade299e932967de27519338d41de348fb5b061 (git) Affected: 6460e75a104d10458817d2f5b2fbff775bf0b43a , < d06a310b45e153872033dd0cf19d5a2279121099 (git)
Linux	Linux	Affected: 2.6.19 Unaffected: 0 , < 2.6.19 (semver) Unaffected: 5.10.258 , ≤ 5.10.* (semver) Unaffected: 5.15.209 , ≤ 5.15.* (semver) Unaffected: 6.1.175 , ≤ 6.1.* (semver) Unaffected: 6.6.141 , ≤ 6.6.* (semver) Unaffected: 6.12.91 , ≤ 6.12.* (semver) Unaffected: 6.18.33 , ≤ 6.18.* (semver) Unaffected: 7.0.10 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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          "value": "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."
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          "url": "https://git.kernel.org/stable/c/d06a310b45e153872033dd0cf19d5a2279121099"
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    "dateReserved": "2026-06-09T07:44:35.397Z",
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[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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/scsi/sg.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6460e75a104d10458817d2f5b2fbff775bf0b43a\",\"lessThan\":\"3d74e0654ac908c65a8f20373091826fe43b1363\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6460e75a104d10458817d2f5b2fbff775bf0b43a\",\"lessThan\":\"c47ccfb3d80dfed522ca06a5954ac97488d78c5a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6460e75a104d10458817d2f5b2fbff775bf0b43a\",\"lessThan\":\"fe671d3c84ffb1b763d590c25195755adeaadaba\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6460e75a104d10458817d2f5b2fbff775bf0b43a\",\"lessThan\":\"c5f4a211e82d04ccc1809311322c47023bbe66e2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6460e75a104d10458817d2f5b2fbff775bf0b43a\",\"lessThan\":\"9676ca7b1ef31a3a65b3e61e7ce3b54ce7364202\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6460e75a104d10458817d2f5b2fbff775bf0b43a\",\"lessThan\":\"1afd963fcd963db0dc5d47df6dfcf010c9c4647e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6460e75a104d10458817d2f5b2fbff775bf0b43a\",\"lessThan\":\"feade299e932967de27519338d41de348fb5b061\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6460e75a104d10458817d2f5b2fbff775bf0b43a\",\"lessThan\":\"d06a310b45e153872033dd0cf19d5a2279121099\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/scsi/sg.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.19\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.19\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.258\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.209\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.141\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.91\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.33\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.10\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1afd963fcd963db0dc5d47df6dfcf010c9c4647e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3d74e0654ac908c65a8f20373091826fe43b1363\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9676ca7b1ef31a3a65b3e61e7ce3b54ce7364202\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c47ccfb3d80dfed522ca06a5954ac97488d78c5a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c5f4a211e82d04ccc1809311322c47023bbe66e2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d06a310b45e153872033dd0cf19d5a2279121099\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fe671d3c84ffb1b763d590c25195755adeaadaba\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/feade299e932967de27519338d41de348fb5b061\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}

GHSA-CX67-J66H-CM23

Vulnerability from github – Published: 2026-06-26 21:32 – Updated: 2026-06-26 21:32

Details

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.

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-53304"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-26T20:17:23Z",
    "severity": null
  },
  "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": "GHSA-cx67-j66h-cm23",
  "modified": "2026-06-26T21:32:17Z",
  "published": "2026-06-26T21:32:17Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53304"
    },
    {
      "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

MSRC_CVE-2026-53304

Vulnerability from csaf_microsoft - Published: 2026-06-02 00:00 - Updated: 2026-06-28 01:02

Summary

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

Notes

Additional Resources: To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

Disclaimer: The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

CVE-2026-53304

Affected products

Under investigation 1 product

Product	Identifier	Version	Remediation
Unresolved product id: 17084-1		—

References

4 references

URL	Category
https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self
https://support.microsoft.com/lifecycle	external
https://www.first.org/cvss	external
https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self

JSON

To clipboard

{
  "document": {
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Public",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "CVE-2026-53304 scsi: sg: Resolve soft lockup issue when opening /dev/sgX - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-53304.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Support Lifecycle",
        "url": "https://support.microsoft.com/lifecycle"
      },
      {
        "category": "external",
        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "scsi: sg: Resolve soft lockup issue when opening /dev/sgX",
    "tracking": {
      "current_release_date": "2026-06-28T01:02:48.000Z",
      "generator": {
        "date": "2026-06-28T07:10:57.325Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-53304",
      "initial_release_date": "2026-06-02T00:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-06-28T01:02:48.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "3.0",
                "product": {
                  "name": "Azure Linux 3.0",
                  "product_id": "17084"
                }
              }
            ],
            "category": "product_name",
            "name": "Azure Linux"
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-53304",
      "notes": [
        {
          "category": "general",
          "text": "Linux",
          "title": "Assigning CNA"
        }
      ],
      "product_status": {
        "under_investigation": [
          "17084-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-53304 scsi: sg: Resolve soft lockup issue when opening /dev/sgX - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-53304.json"
        }
      ],
      "title": "scsi: sg: Resolve soft lockup issue when opening /dev/sgX"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-53304 (GCVE-0-2026-53304)

GHSA-CX67-J66H-CM23

MSRC_CVE-2026-53304

Tags

Sightings

Nomenclature