FFmpeg up to 9.0.2 V4L2 mem2mem decoder v4l2_buffers.c ff_v4l2_m2m_codec_reinit deadlock

CVSS Meta Temp Score
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CTI Interest Score
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3.7$0-$5k0.00+

Summaryinfo

A vulnerability marked as problematic has been reported in FFmpeg up to 9.0.2. This issue affects the function ff_v4l2_m2m_codec_reinit of the file libavcodec/v4l2_buffers.c of the component V4L2 mem2mem decoder. The manipulation leads to deadlock. This vulnerability is listed as CVE-2026-125191. The attack must be carried out locally. There is no available exploit.

Detailsinfo

A vulnerability was found in FFmpeg up to 9.0.2 and classified as problematic. This issue affects the function ff_v4l2_m2m_codec_reinit of the file libavcodec/v4l2_buffers.c of the component V4L2 mem2mem decoder. The manipulation with an unknown input leads to a deadlock vulnerability. Using CWE to declare the problem leads to CWE-833. The product contains multiple threads or executable segments that are waiting for each other to release a necessary lock, resulting in deadlock. Impacted is availability. The summary by CVE is:

FFmpeg through 9.0.2 contains a reference count leak in libavcodec/v4l2_buffers.c that allows attackers to deadlock the V4L2 mem2mem decoder on multi-plane capture formats. Attackers can supply crafted H.264, HEVC, or VP9 streams with resolution changes, making ff_v4l2_m2m_codec_reinit() wait forever and hang the decoding application.

It is possible to read the advisory at code.ffmpeg.org. The identification of this vulnerability is CVE-2026-125191 since 11/09/2026. The exploitation is known to be easy. Attacking locally is a requirement. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 3.7
VulDB Meta Temp Score: 3.7

VulDB Base Score: 2.8
VulDB Temp Score: 2.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 4.7
CNA Vector (VulnCheck): 🔒

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Deadlock
CWE: CWE-833 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

11/09/2026 Advisory disclosed
11/09/2026 +0 days CVE reserved
11/09/2026 +0 days VulDB entry created
11/09/2026 +0 days VulDB entry last update

Sourcesinfo

Product: ffmpeg.org

Advisory: code.ffmpeg.org
Status: Not defined

CNA: VulnCheck
CVE: CVE-2026-125191 (🔒)

GCVE (CVE): GCVE-0-2026-125191
GCVE (VulDB): GCVE-100-433283

Entryinfo

Created: 11/09/2026 20:32
Changes: 11/09/2026 20:32 (75)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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