RHSA-2026:30814HighCVSS 7.6

Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

Published
June 28, 2026
Last Modified
August 18, 2026

🔗 CVE IDs covered (4)

CVE-2026-56208 →CVE-2026-56209 →CVE-2026-56210 →CVE-2026-56211 →

📋 Description

CVE-2026-56208 — libaom: libaom: heap buffer overflow in AV1 encoder first-pass stats buffer via LAP mode CVE-2026-56209 — libaom: libaom: arbitrary address write via SVC layer context OOB and cyclic refresh map pointer hijack CVE-2026-56210 — libaom: libaom: heap-buffer-overflow read via missing bounds check in ctrl_set_layer_id CVE-2026-56211 — libaom: libaom: remote code execution via SVC layer context handling with attacker-controlled frames

🎯 Affected products4

  • Red Hat Hardened Images
  • aom-main@aarch64 as a component of Red Hat Hardened Images
  • aom-main@src as a component of Red Hat Hardened Images
  • aom-main@x86_64 as a component of Red Hat Hardened Images

✅ Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ Workaround: There is no complete mitigation for this vulnerability. The following measures can reduce risk: 1. If using libaom as a standalone encoder library, avoid setting g_lag_in_frames to values >= 1 when processing untrusted input, or validate all encoder configuration parameters before passing them to the libaom API. 2. For Firefox and Thunderbird, ensure browsers are updated to versions that include the patched libaom (v3.14.0 or later). 3. For standalone libaom deployments (RHEL-AI, Hummingbird), restrict access to the encoding service to trusted clients only. 4. Apply network-level access controls to limit who can submit video for encoding. Workaround: There is no complete mitigation for this vulnerability. The following measures can reduce risk: 1. If using libaom as a standalone encoder library with SVC enabled, validate that spatial_layer_id and temporal_layer_id values are within the configured range [0, configured_layers) before calling aom_codec_control with AV1E_SET_SVC_LAYER_ID. 2. Restrict access to encoding services to trusted clients only. Do not expose libaom SVC encoder configuration to untrusted input. 3. For Firefox and Thunderbird, ensure browsers are updated to versions that include the patched libaom (v3.14.0 or later). 4. Deploy encoding services with ASLR, stack canaries, and other exploit mitigation technologies enabled. Workaround: There is no complete mitigation for this vulnerability. The following measures can reduce risk: 1. If using libaom as a standalone encoder library with SVC enabled, validate that spatial_layer_id does not exceed the number of configured spatial layers before calling aom_codec_control with AV1E_SET_SVC_LAYER_ID. 2. Restrict access to encoding services to trusted clients only. 3. For Firefox and Thunderbird, ensure browsers are updated to versions that include the patched libaom (v3.14.0 or later). 4. Monitor encoding service processes for unexpected crashes (segfaults) that may indicate exploitation attempts. Workaround: There is no complete mitigation for this vulnerability. The following measures can reduce risk: 1. If using libaom as a standalone encoder in a fork-based service, validate all SVC layer parameters (spatial_layer_id, temporal_layer_id) against configured bounds before passing them to the encoder API. 2. Avoid fork-based architectures for encoding services that accept untrusted input. Use thread-based or container-isolated workers instead, which prevent crash oracle attacks. 3. Restrict access to encoding services to trusted clients only. Do not expose SVC encoder configuration or frame submission to untrusted network input. 4. For Firefox and Thunderbird, ensure browsers are updated to versions that include the patched libaom (v3.14.0 or later). 5. Enable all available exploit mitigations (ASLR, PIE, stack canaries, CFI) on encoding service binaries.

🔗 References (8)