Riskcovery

CVE-2026-53304

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

State
Published
Severity
Not scored
Published
Jun 26, 2026
Updated
Jun 26, 2026
Reserved
Jun 9, 2026

Read the record on cve.org

Description

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 6460e75a104d10458817d2f5b2fbff775bf0b43a to before 3d74e0654ac908c65a8f20373091826fe43b1363Affected
  • 6460e75a104d10458817d2f5b2fbff775bf0b43a to before c47ccfb3d80dfed522ca06a5954ac97488d78c5aAffected
  • 6460e75a104d10458817d2f5b2fbff775bf0b43a to before fe671d3c84ffb1b763d590c25195755adeaadabaAffected
  • 6460e75a104d10458817d2f5b2fbff775bf0b43a to before c5f4a211e82d04ccc1809311322c47023bbe66e2Affected
  • 6460e75a104d10458817d2f5b2fbff775bf0b43a to before 9676ca7b1ef31a3a65b3e61e7ce3b54ce7364202Affected
  • 6460e75a104d10458817d2f5b2fbff775bf0b43a to before 1afd963fcd963db0dc5d47df6dfcf010c9c4647eAffected
  • 6460e75a104d10458817d2f5b2fbff775bf0b43a to before feade299e932967de27519338d41de348fb5b061Affected
  • 6460e75a104d10458817d2f5b2fbff775bf0b43a to before d06a310b45e153872033dd0cf19d5a2279121099Affected
LinuxLinux
  • 2.6.19Affected
  • before 2.6.19Not affected
  • 5.10.258 through 5.10.*Not affected
  • 5.15.209 through 5.15.*Not affected
  • 6.1.175 through 6.1.*Not affected
  • 6.6.141 through 6.6.*Not affected
  • 6.12.91 through 6.12.*Not affected
  • 6.18.33 through 6.18.*Not affected
  • 7.0.10 through 7.0.*Not affected
  • 7.1 and laterNot affected

References

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