CVE-2026-53304None▾ SunlitIn 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 restric…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 6.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.1%
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.
Linux >= 6460e75a104d10458817d2f5b2fbff775bf0b43a < 3d74e0654ac908c65a8f20373091826fe43b1363Linux >= 6460e75a104d10458817d2f5b2fbff775bf0b43a < c47ccfb3d80dfed522ca06a5954ac97488d78c5aLinux >= 6460e75a104d10458817d2f5b2fbff775bf0b43a < fe671d3c84ffb1b763d590c25195755adeaadabaLinux >= 6460e75a104d10458817d2f5b2fbff775bf0b43a < c5f4a211e82d04ccc1809311322c47023bbe66e2Linux >= 6460e75a104d10458817d2f5b2fbff775bf0b43a < 9676ca7b1ef31a3a65b3e61e7ce3b54ce7364202Linux >= 6460e75a104d10458817d2f5b2fbff775bf0b43a < 1afd963fcd963db0dc5d47df6dfcf010c9c4647eLinux >= 6460e75a104d10458817d2f5b2fbff775bf0b43a < feade299e932967de27519338d41de348fb5b061Linux >= 6460e75a104d10458817d2f5b2fbff775bf0b43a < d06a310b45e153872033dd0cf19d5a2279121099Linux 2.6.19Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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