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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-53304
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-26 20:17:23 UTC
Updated2026-07-06 20:24:15 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

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

EPSS: 0.001850000 probability, percentile 0.082990000 (date 2026-07-04)

Problem Types: CWE-667

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 6460e75a104d10458817d2f5b2fbff775bf0b43a 3d74e0654ac908c65a8f20373091826fe43b1363 git Not specified
CNA Linux Linux affected 6460e75a104d10458817d2f5b2fbff775bf0b43a c47ccfb3d80dfed522ca06a5954ac97488d78c5a git Not specified
CNA Linux Linux affected 6460e75a104d10458817d2f5b2fbff775bf0b43a fe671d3c84ffb1b763d590c25195755adeaadaba git Not specified
CNA Linux Linux affected 6460e75a104d10458817d2f5b2fbff775bf0b43a c5f4a211e82d04ccc1809311322c47023bbe66e2 git Not specified
CNA Linux Linux affected 6460e75a104d10458817d2f5b2fbff775bf0b43a 9676ca7b1ef31a3a65b3e61e7ce3b54ce7364202 git Not specified
CNA Linux Linux affected 6460e75a104d10458817d2f5b2fbff775bf0b43a 1afd963fcd963db0dc5d47df6dfcf010c9c4647e git Not specified
CNA Linux Linux affected 6460e75a104d10458817d2f5b2fbff775bf0b43a feade299e932967de27519338d41de348fb5b061 git Not specified
CNA Linux Linux affected 6460e75a104d10458817d2f5b2fbff775bf0b43a d06a310b45e153872033dd0cf19d5a2279121099 git Not specified
CNA Linux Linux affected 2.6.19 Not specified
CNA Linux Linux unaffected 2.6.19 semver Not specified
CNA Linux Linux unaffected 5.10.258 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.141 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.91 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.33 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/1afd963fcd963db0dc5d47df6dfcf010c9c4647e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/3d74e0654ac908c65a8f20373091826fe43b1363 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/9676ca7b1ef31a3a65b3e61e7ce3b54ce7364202 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/fe671d3c84ffb1b763d590c25195755adeaadaba 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/feade299e932967de27519338d41de348fb5b061 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/c47ccfb3d80dfed522ca06a5954ac97488d78c5a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d06a310b45e153872033dd0cf19d5a2279121099 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/c5f4a211e82d04ccc1809311322c47023bbe66e2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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