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🛡️ CVE-2026-53304 — kernel

🟡 CVSS 5.5 — Medium ✅ No Known Exploit NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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

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.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

  • Attack vector: Local — a local account, shell or session on the host is needed.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: Low — an ordinary user account is enough.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: None.
  • Integrity impact: None.
  • Availability impact: High — total loss, or loss the attacker controls.

Affected software

CVE-2026-53304 is recorded against 2 packages.

  • kernel (from 6.19.0 up to 7.0.10)
  • linux-kernel (from 6.19 up to 7.0.10)

Timeline and source

Published on 26 June 2026 and last revised on 12 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

Other advisories for this package

kernel has other advisories on record. If you are patching this one, these are worth checking on the same host:

Details

Severity Medium
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2026-06-26
Updated 2026-08-20
Modified 2026-08-12

Affected Packages

Software From version Fixed in
kernel 6.19.0 7.0.10
linux-kernel 6.19 7.0.10

References

Similar Threats

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