Bug 2569605 (CVE-2026-125208)

Summary: CVE-2026-125208 ffmpeg: ffmpeg: Arbitrary code execution via out-of-bounds write in V4L2 buffer handling
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: bbrownin
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in FFmpeg. By supplying a specially crafted video file with manipulated dimensions or padding, an attacker could trigger an out-of-bounds memory write during Video4Linux2 (V4L2) encoding. This issue occurs because buffer offsets are not properly validated against the allocated buffer size, causing an integer wraparound during memory copy operations. Successful exploitation may result in arbitrary code execution or an application crash leading to a denial of service (DoS).
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-11-10 13:11:50 UTC 
FFmpeg through 9.0.2 contains an out-of-bounds write vulnerability in v4l2_buffer_swframe_to_buf() in libavcodec/v4l2_buffers.c because cumulative plane offsets are not checked against the V4L2 buffer length. Attackers can supply crafted video whose dimensions or padding cause unsigned wraparound in v4l2_bufref_to_buf(), making memcpy() write past the mmaped driver buffer during V4L2 M2M encoding.