scsi: sg: Resolve soft lockup issue when opening /dev/sgX
Summary
| CVE | CVE-2026-53304 |
|---|
| State | PUBLISHED |
|---|
| Assigner | Linux |
|---|
| Source Priority | CVE Program / NVD first with legacy fallback |
|---|
| Published | 2026-06-26 20:17:23 UTC |
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| Updated | 2026-06-26 20:17:23 UTC |
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| 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. |
|---|
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|
| 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
| Reference | Source | Link | Tags |
|---|
| git.kernel.org/stable/c/1afd963fcd963db0dc5d47df6dfcf010c9c4647e |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/3d74e0654ac908c65a8f20373091826fe43b1363 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/9676ca7b1ef31a3a65b3e61e7ce3b54ce7364202 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/fe671d3c84ffb1b763d590c25195755adeaadaba |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/feade299e932967de27519338d41de348fb5b061 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/c47ccfb3d80dfed522ca06a5954ac97488d78c5a |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/d06a310b45e153872033dd0cf19d5a2279121099 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/c5f4a211e82d04ccc1809311322c47023bbe66e2 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| CVE Program record |
CVE.ORG |
www.cve.org |
canonical |
| NVD vulnerability detail |
NVD |
nvd.nist.gov |
canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.
