CVE-2024-26933

USB: core: Fix deadlock in port "disable" sysfs attribute

Published May 1, 2024 CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed
Description
In the Linux kernel, the following vulnerability has been resolved:

USB: core: Fix deadlock in port "disable" sysfs attribute

The show and store callback routines for the "disable" sysfs attribute
file in port.c acquire the device lock for the port's parent hub
device. This can cause problems if another process has locked the hub
to remove it or change its configuration:

Removing the hub or changing its configuration requires the
hub interface to be removed, which requires the port device
to be removed, and device_del() waits until all outstanding
sysfs attribute callbacks for the ports have returned. The
lock can't be released until then.

But the disable_show() or disable_store() routine can't return
until after it has acquired the lock.

The resulting deadlock can be avoided by calling
sysfs_break_active_protection(). This will cause the sysfs core not
to wait for the attribute's callback routine to return, allowing the
removal to proceed. The disadvantage is that after making this call,
there is no guarantee that the hub structure won't be deallocated at
any moment. To prevent this, we have to acquire a reference to it
first by calling hub_get().

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Ubuntu USN Ubuntu USN USN-6816-1 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-6817-1 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-6817-2 Linux kernel (OEM) vulnerabilities
Ubuntu USN Ubuntu USN USN-6817-3 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-6878-1 Linux kernel (Oracle) vulnerabilities
History
Type Values Removed Values Added
CPEs cpe:/a:redhat:enterprise_linux:9
cpe:/o:redhat:enterprise_linux:9
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Linux
Published
Updated
May 11, 2026, 8:07 PM
Reserved
Feb 19, 2024, 2:20 PM
Status
Analyzed
Published
May 1, 2024, 6:15 AM
Modified
Jun 17, 2026, 7:18 AM
Severity
Low
Public date
May 1, 2024, 12:00 AM