[CVE-2026-53379][LOW] media: i2c: ov8856: free control handler on error in ov8856_init_controls()

[AL-KERNEL <alkernel@kernelcve.org>]

CVE: CVE-2026-53379
Priority: LOW
AL-KERNEL base severity: LOW
KPANIC flag: NO
Patch: media: i2c: ov8856: free control handler on error in ov8856_init_controls()
Commit: c13721040a566d832ee8a20ecf04b7ef288a1525
Upstream patch: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=c13721040a566d832ee8a20ecf04b7ef288a1525
Original CVE announcement: https://lore.kernel.org/linux-cve-announce/?q=CVE-2026-53379
Analysis date: Sun, 19 Jul 2026 06:53:52 -0400
ActionableScore: 0
ActionableScore lower bound: unknown
Actionable bucket: Ordinary Moderate / Low-like
Manual review required: NO

Summary:
No one-sentence report phrase was found.

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ABOUT THIS REPORT
======================================================================

The original Linux kernel CVE announcement for CVE-2026-53379 is available here:
https://lore.kernel.org/linux-cve-announce/?q=CVE-2026-53379

The original announcement does not normally provide a security severity
estimate, CVSS assessment, or enough information to determine whether the
reported kernel bug represents a practically relevant security issue.

This report was generated by AL-KERNEL, an AI-assisted Linux kernel
vulnerability analysis system developed by Alexander Larkin. It combines
an autonomous classifier with LLM-assisted technical analysis and a
separate ActionableScore mechanism.

The purpose of this report is to prioritize Linux kernel CVEs before
manual review, identify cases that require prompt investigation, and
support automatic closure of issues that are unlikely to have meaningful
security impact.

Published priority for this report: LOW
Manual review required: NO

A detailed explanation of the methodology and priority rules is included
at the end of this message.

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AL-KERNEL CLASSIFICATION RESULT
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CVE-2026-53379	LOW	CHECK WITH IMPACT FROM ORIG NN MODERATE	Maybe valid. Check manually. Hints by AL-KERNEL: The best (paranoid) CVSS is 'AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H';*CWE-401;*CWE-772;CWE-703;Other CVSS 'AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L';BEST CVSS score: '4.1';DESCR 'A resource leak in the ov8856 camera sensor driver can occur when ov8856_init_controls fails while adding V4L2 controls. The function returned the control handler error without freeing the already initialized control handler, so repeated failed probe or initialization attempts could leak kernel memory. For the CVSS the PR:H is used because reliable triggering typically requires administrative control over driver loading, device binding, or probe error conditions. The issue is not network reachable and does not provide a direct memory corruption primitive. Impact is limited to denial of service through resource exhaustion in sustained or artificial failure scenarios.';NO MANUAL CHECK; ,and ActionableScore result is Ordinary Moderate / Low-like (with actual score 0)	YES	USB INIT UAF HARDWARE  DECREASED_TO_MODERATE_REGULAR_FROM_MODERATE7_BASED_ON_GUESSCVSS DECREASED_TO_LOW_FROM_MODERATE_BASED_ON_ACTIONABLESCORELESSTHAN3	YES	NO	guess

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ACTIONABLESCORE ANALYSIS
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ActionableScore=0

1. ActionableScore
* Conservative score: 0
* Paranoid score: 0
* Final recommended bucket: **Ordinary Moderate / Low-like**::

2. Signal breakdown
* Resource leak only: v4l2_ctrl_handler was not freed on an error path in ov8856_init_controls().
* No generic memory corruption: no UAF, double free, OOB access, stale callback, refcount abuse, or attacker-controlled overwrite is shown.
* No local unprivileged trigger: reliable triggering normally requires driver probe or rebinding control, device setup control, or induced allocation/control creation failure.
* Requires admin/root/CAP-style control in typical deployments: -2.
* Rare hardware/device-specific path: OV8856 camera sensor driver probe/init path, not a broad default kernel attack surface.
* Availability impact is only theoretical through repeated leaks across failed initialization attempts. It is not an immediate reliable system-wide DoS.

3. Reachability analysis
The bug is reachable during OV8856 sensor driver initialization when V4L2 control creation fails. In typical deployments, an attacker would need administrative control over module loading, device binding, probe retries, or fault-injection-like conditions to trigger the error path repeatedly. Namespaces and containers do not normally expose this device probe path to unprivileged users. The path is not network reachable and depends on specific camera hardware or platform configuration.

4. Severity interpretation
This behaves like a low-severity resource leak rather than an actionable kernel security issue. The theoretical worst case is memory exhaustion after repeated failed probe attempts, but the patch does not show a memory corruption primitive or a plausible privilege escalation path. Realistic exploitation requires privileged local control and specific device conditions, so this should not be treated as Important or Actionable Moderate.

5. One-sentence report phrase
A privileged local resource leak in the OV8856 V4L2 camera driver error path can leak a control handler on failed initialization, with impact limited to possible DoS through repeated failed probes.

6. Manual review recommendation
NO MANUAL CHECK NEEDED. This is a privileged device-specific error-path resource leak with no network exposure and no demonstrated memory corruption or privilege escalation primitive.

======================================================================
UPSTREAM PATCH SUMMARY
======================================================================

Patch: media: i2c: ov8856: free control handler on error in ov8856_init_controls()
Commit: c13721040a566d832ee8a20ecf04b7ef288a1525
Upstream URL: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=c13721040a566d832ee8a20ecf04b7ef288a1525

Commit description:

The control handler wasn't freed if adding controls failed, add an error
exit label and convert the existing error return to use it.

Fixes: 879347f ("media: ov8856: Add support for OV8856 sensor")
Cc: stable@vger.kernel.org
Signed-off-by: Alexander Koskovich <akoskovich@pm.me>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Changed files:
  drivers/media/i2c/ov8856.c

Diff excerpt:

Not included in this email. See the upstream URL for the full patch.

Full patch:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=c13721040a566d832ee8a20ecf04b7ef288a1525

======================================================================
DETAILED REPORT METHODOLOGY
======================================================================

The original Linux kernel CVE announcement for CVE-2026-53379 can be found here:
https://lore.kernel.org/linux-cve-announce/?q=CVE-2026-53379

The original CVE announcement normally does not include a security-level
estimate. In particular, it may not contain a CVSS assessment, an impact
level, or enough information to determine whether the reported bug is a
practically relevant security issue. One purpose of this parallel CVE list
is to provide that missing technical and prioritization information.

The original goal of the AL-KERNEL project was to prioritize Linux kernel
CVE analysis automatically before manual review. The system can also help
identify non-security issues that may be suitable for automatic closure.

This report was generated by AL-KERNEL, an AI-assisted Linux kernel
vulnerability analysis system developed by Alexander Larkin.

The first analysis stage combines an autonomous classifier with additional
LLM-based analysis. The autonomous classifier runs locally on a CPU and is
based on a backpropagation neural network. Together, these mechanisms
produce a technical vulnerability description, identify likely weakness
types, estimate CVSS severity, and provide input for ActionableScore.

Two CVSS estimates are retained because incomplete kernel vulnerability
information often permits more than one defensible interpretation:

  Conservative CVSS vector: AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L
  The Best / paranoid CVSS vector: AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
  The Best / paranoid CVSS score: 4.1

The conservative vector represents a lower-impact interpretation.
The Best/paranoid vector intentionally represents a plausible upper-bound
interpretation and should not automatically be treated as demonstrated
real-world impact.

CVSS may also need to be adjusted for a particular Linux deployment,
because actual reachability, privileges, enabled kernel configuration,
hardware, namespaces, exposed device nodes, and other environmental
conditions can differ significantly between systems.

A separate ActionableScore mechanism evaluates practical remediation
urgency. Its analysis may include reachability, attack prerequisites,
subsystem exposure, memory-corruption characteristics, denial-of-service
reliability, and possible confidentiality, integrity, or
privilege-escalation impact.

  Conservative ActionableScore: unknown
  Paranoid ActionableScore: 0

The final base severity is taken directly from the second tab-separated
field of the AL-KERNEL classification result. ActionableScore does not
replace or independently override that final AL-KERNEL decision, and
if ActionableScore adjusted impact level of ALKERNEL, then you would see
self-readable flags above like INCREASED_TO_HIGH_BASED_ON_ACTIONABLESCOREHIGHEREQTHAN7.

For an AL-KERNEL result of MODERATE, this report uses the following
additional presentation split:

  ActionableScore below 5   -> MODERATE REGULAR
  ActionableScore 5 or more -> MODERATE 7.0

The distinction between MODERATE REGULAR and MODERATE 7.0 makes it
possible to identify Moderate issues that should receive manual analysis
and fixes before lower-priority MODERATE REGULAR issues. In many cases,
MODERATE REGULAR fixes may wait for a later rebase or routine update.

There is one override in which MODERATE REGULAR becomes MODERATE 7.0
even when the ActionableScore is below 5. When the AL-KERNEL result
contains the KPANIC flag, a MODERATE result is always presented as
MODERATE 7.0. The KPANIC flag selected with few regexps without
usage of AI at all, so it helps to detect cases when Kernel Crash happens
and similar (to filter False-Negative results from the LLM usage).

KPANIC indicates that a reliable kernel crash, kernel panic, or similarly
serious kernel availability impact was identified by the classification
workflow.

AL-KERNEL base severity for this report: LOW
KPANIC detected for this report: NO
Published priority for this report (same as in Subject): LOW

These results are intended to support engineering triage. They are
machine-generated estimates, and cases marked for manual review should
be validated by a human security engineer before final disposition.
For more info read docs linked from here: https://kernelcve.org/
(and you can submit you own patch there to generate such a report
for non-existant CVE-id yet).

Note that in many cases this AI tool selects higher severity, than
real is (means you can expect Importants instead of Moderate 7.0 or
Moderates 7.0 instead of regular Moderates). If you see such cases,
please use reply email interface to add additional manual analyses
info to this particular CVE.
And please, please, let me know when you see Lows instead of Importants
or Important instead of Low (because particular for such cases I
need to tune this AI tool to make it better for this one and next similar).
My contact email for such notifications is alexanjelausa@gmail.com (and both
send reply to CVE record itself too and see "reply" button below for howto reply).