CVE-2026-75145
Description
A flaw was found in FFmpeg. An incorrect integer narrowing conversion in the AV1 RTP packetizer can lead to an out-of-bounds memory access. This occurs when processing specially crafted AV1 RTP (Real-time Transport Protocol) packets, where a large OBU (Operating Block Unit) size is incorrectly handled due to a casting issue on certain platforms. An attacker could exploit this to cause a denial of service or potentially execute arbitrary code.
Statement
The ffmpeg package is not shipped in base Red Hat Enterprise Linux. It is available through EPEL, Red Hat Enterprise Linux AI, and as a bundled dependency in Red Hat OpenShift AI container images. The vulnerable code resides in the AV1 RTP packetizer (libavformat/rtpenc_av1.c), which is compiled and shipped in all FFmpeg builds across these products. This integer narrowing bug primarily affects platforms where long is 32-bit (e.g. 64-bit Windows). On Linux, long is 64-bit on all supported architectures (x86_64, aarch64, ppc64le, s390x), significantly reducing exploitability. 32-bit architectures (i686, armv7hl) could theoretically be affected.
Mitigation
No mitigation is currently available for this flaw.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.8 | N/A | 5.8 |
| Attack Vector | Local | N/A | Local |
| Attack Complexity | High | N/A | High |
| Privileges Required | None | N/A | None |
| User Interaction | Required | N/A | Required |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | Low | N/A | Low |
| Integrity Impact | Low | N/A | Low |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:H
cve.org: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:H
Understanding the Weakness (CWE)
Integrity
Technical Impact: Modify Memory; Execute Unauthorized Code or Commands
Write operations could cause memory corruption. In some cases, an adversary can modify control data such as return addresses in order to execute unexpected code.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
Attempting to access out-of-range, invalid, or unauthorized memory could cause the product to crash.
Other
Technical Impact: Unexpected State
Subsequent write operations can produce undefined or unexpected results.
Acknowledgements
Upstream acknowledges Joshua Rogers (AISLE Research) as the original reporter.
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