CVE-2026-56209: Libaom: libaom: arbitrary address write via svc layer context oob and cyclic refresh map pointer hijack

Severity: high (CVSS 7.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-19 · updated 2026-10-19
Weakness: CWE-787

Description

An arbitrary address write vulnerability was found in libaom, the reference AV1 codec implementation. A missing bounds check in the SVC (Scalable Video Coding) layer ID control function allows an attacker to inject an arbitrary pointer into the cyclic refresh map field via crafted image pixel values. The encoder then writes approximately 1,200 bytes at the attacker-controlled address. This is fully deterministic and does not require a separate information leak. An attacker who can supply frames to a network-facing libaom encoder with SVC enabled could exploit this for denial of service or potential code execution.

Affected products

Red Hat AI Inference Server: all versions
Red Hat AI Inference Server 3.2: all versions — fixed in 1787772157, 1787860580, 1787884873
Red Hat AI Inference Server 3.3: all versions — fixed in 1789502493, 1789504371, 1789508287, 1789582776
Red Hat Enterprise Linux 10: all versions
Red Hat Enterprise Linux 9: all versions
Red Hat Enterprise Linux AI 3.3: all versions — fixed in 1790791893, 1790850900, 1790866732, 1790936334, 1790936351, 1790954179
Red Hat Enterprise Linux AI 3.3 for RHEL 9: all versions — fixed in 0:3.14.0-1.el9ai
Red Hat Enterprise Linux AI 3.4 for RHEL 9: all versions — fixed in 0:3.14.0-1.el9ai
Red Hat Enterprise Linux AI 3.5 for RHEL 9: all versions — fixed in 0:3.14.0-1.el9ai
Red Hat Hardened Images: all versions — fixed in 3.14.0-0.1.hum1
Red Hat OpenShift AI 3.3: all versions — fixed in 1789137548, 1789137552, 1789137607, 1789137636, 1789137641
Red Hat OpenShift AI 3.4: all versions — fixed in 1786611800, 1787076481, 1787076778, 1787077779, 1788197530, 1788197549
Red Hat OpenShift AI 3.5: all versions — fixed in 1788197385, 1788197492, 1788197512, 1788197542, 1788197688, 1788197975

How to fix

Upgrade to a fixed version: Red Hat AI Inference Server 3.2 1787772157, 1787860580, 1787884873; Red Hat AI Inference Server 3.3 1789502493, 1789504371, 1789508287, 1789582776; Red Hat Enterprise Linux AI 3.3 1790791893, 1790850900, 1790866732, 1790936334; Red Hat Enterprise Linux AI 3.3 for RHEL 9 0:3.14.0-1.el9ai; Red Hat Enterprise Linux AI 3.4 for RHEL 9 0:3.14.0-1.el9ai; Red Hat Enterprise Linux AI 3.5 for RHEL 9 0:3.14.0-1.el9ai; Red Hat Hardened Images 3.14.0-0.1.hum1; Red Hat OpenShift AI 3.3 1789137548, 1789137552, 1789137607, 1789137636; Red Hat OpenShift AI 3.4 1786611800, 1787076481, 1787076778, 1787077779; Red Hat OpenShift AI 3.5 1788197385, 1788197492, 1788197512, 1788197542. Check the vendor advisory for mitigations.

References

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