Answer in brief
CVE-2026-53304 records a Medium severity (CVSS 5.5) vulnerability in scsi: sg: Resolve soft lockup issue when opening /dev/sgX. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=6460e75a104d10458817d2f5b2fbff775bf0b43a <3d74e0654ac908c65a8f20373091826fe43b1363 || >=6460e75a104d10458817d2f5b2fbff775bf0b43a <c47ccfb3d80dfed522ca06a5954ac97488d78c5a || >=6460e75a104d10458817d2f5b2fbff775bf0b43a <fe671d3c84ffb1b763d590c25195755adeaadaba || >=6460e75a104d10458817d2f5b2fbff775bf0b43a <c5f4a211e82d04ccc1809311322c47023bbe66e2 || >=6460e75a104d10458817d2f5b2fbff775bf0b43a <9676ca7b1ef31a3a65b3e61e7ce3b54ce7364202 || >=6460e75a104d10458817d2f5b2fbff775bf0b43a <1afd963fcd963db0dc5d47df6dfcf010c9c4647e || >=6460e75a104d10458817d2f5b2fbff775bf0b43a <feade299e932967de27519338d41de348fb5b061 || >=6460e75a104d10458817d2f5b2fbff775bf0b43a <d06a310b45e153872033dd0cf19d5a2279121099 | 3d74e0654ac908c65a8f20373091826fe43b1363, c47ccfb3d80dfed522ca06a5954ac97488d78c5a, fe671d3c84ffb1b763d590c25195755adeaadaba, c5f4a211e82d04ccc1809311322c47023bbe66e2, 9676ca7b1ef31a3a65b3e61e7ce3b54ce7364202, 1afd963fcd963db0dc5d47df6dfcf010c9c4647e, feade299e932967de27519338d41de348fb5b061, d06a310b45e153872033dd0cf19d5a2279121099 |
| Linux/Linuxgeneric | 2.6.19 | Not reported |
Published upstream
Jun 26, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 26, 2026
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.
Quoted source text, attributed separately from HOL analysis.