CVE-2026-53304

MediumCVSS 5.5/10Last modified Jul 6, 2026

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.

Metrics

CVSS 3.1 5.5/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-667

Affected software

VendorProductVersions
LinuxLinux>= 6460e75a104d10458817d2f5b2fbff775bf0b43a, < 3d74e0654ac908c65a8f20373091826fe43b1363; >= 6460e75a104d10458817d2f5b2fbff775bf0b43a, < c47ccfb3d80dfed522ca06a5954ac97488d78c5a; >= 6460e75a104d10458817d2f5b2fbff775bf0b43a, < fe671d3c84ffb1b763d590c25195755adeaadaba; >= 6460e75a104d10458817d2f5b2fbff775bf0b43a, < c5f4a211e82d04ccc1809311322c47023bbe66e2; >= 6460e75a104d10458817d2f5b2fbff775bf0b43a, < 9676ca7b1ef31a3a65b3e61e7ce3b54ce7364202; >= 6460e75a104d10458817d2f5b2fbff775bf0b43a, < 1afd963fcd963db0dc5d47df6dfcf010c9c4647e; >= 6460e75a104d10458817d2f5b2fbff775bf0b43a, < feade299e932967de27519338d41de348fb5b061; >= 6460e75a104d10458817d2f5b2fbff775bf0b43a, < d06a310b45e153872033dd0cf19d5a2279121099
LinuxLinux2.6.19

References

Timeline

Published
Jun 26, 2026
Last modified
Jul 6, 2026
NVD status
Analyzed

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CVE-2026-53304: Medium severity, CVSS 5.5 | Vulnix