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

Vulnerability from cvelistv5 – Published: 2026-06-26 19:41 – Updated: 2026-06-26 19:41
VLAI
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
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
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)
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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)
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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 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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-07-06T20:56:28+00:00",
      "cve": "CVE-2026-53304",
      "id": "CVE-2026-53304",
      "initial_release_date": "2026-06-26T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: scsi: sg: Resolve soft lockup issue when opening /dev/sgX",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53304.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-06-30T01:42:53Z",
      "cve": "CVE-2026-53304",
      "id": "CVE-2026-53304",
      "initial_release_date": "2026-06-28T01:08:55Z",
      "product_status:known_affected": "291",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53304",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53304.json",
      "version": "3"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.