VulnerabilityPublished 24 Jul 2026

CVE-2026-64233: Linux kernel · usb: gadget: uvc: hold opts->lock across XU walks in uvc_function_bind

Affects Linux kernelSource GCVE Database

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Not known to be exploited.

Data as of 8 Nov 2026, 16:36 UTC

Severity

Low

Rated Low by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation evidence

Disclosed: evidence found.
CVE published 24 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 8 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

AI-suggested

A fix is available that holds opts->lock consistently during extension unit list walks in uvc_function_bind, preventing race conditions. Users should apply the updated Linux kernel version containing this patch. Since the vulnerability requires privileged access and is a correctness fix, no additional mitigation is necessary beyond applying the official patch.

Description

CVE-2026-64233 is a Linux kernel vulnerability in the USB gadget UVC function binding code. It involves a race condition due to missing locking around extension unit list walks during function bind operations. This can lead to dereferencing freed memory if a privileged user concurrently modifies configfs entries while binding the UVC function. The issue affects only privileged processes with configfs mount and gadget UDC write permissions and is considered a correctness fix rather than a security boundary bypass.

Impact

The vulnerability can cause a race condition leading to dereferencing freed memory during USB gadget UVC function binding. Exploitation requires privileged access to mount configfs and write to gadget UDC files, limiting the impact to trusted users with elevated permissions. The fix addresses a correctness issue rather than a direct security boundary bypass. There are no known exploits in the wild.

Summary

The vulnerability in the Linux kernel's USB gadget UVC function (uvc_function_bind) arises because opts->lock is not held consistently during walks of the extension_units list. Specifically, the function walks the list twice without holding the lock: once directly for string-descriptor fixup and multiple times indirectly via uvc_copy_descriptors. Concurrent modifications via configfs operations (uvcg_extension_make/uvcg_extension_drop) that hold opts->lock can race with these walks, potentially causing use-after-free of uvcg_extension structures. The fix involves holding opts->lock throughout the entire sequence of extension unit list walks during binding, matching the locking discipline of configfs callbacks and eliminating unsynchronized readers.

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Exploitation evidence

What to do

Description

AI analysisMachine-generated, updated 8 Nov 2026, 16:36 UTC

Technical details

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