CVE-2026-56211: Out-of-bounds Write in Red Hat Red Hat Enterprise Linux 10
CVE-2026-56211 is a high-severity remote code execution vulnerability in libaom, the AV1 codec implementation used in Red Hat Enterprise Linux 10. It arises from insufficient bounds validation in the AV1 encoder's SVC layer ID control, allowing crafted video frames to overwrite internal encoder structures. Exploitation requires a service using libaom with SVC encoding enabled that accepts attacker-supplied video frames. No official patch or remediation guidance is currently provided by Red Hat.
AI Analysis
Technical Summary
This vulnerability in libaom's AV1 encoder involves an out-of-bounds write due to improper bounds checking of the SVC layer ID control. An attacker can supply specially crafted video frame pixels that overlap with internal encoder layer context structures. In fork-based video processing services, this can lead to hijacking the cyclic refresh map pointer, brute forcing the process base address via a crash oracle, and redirecting control flow to achieve arbitrary command execution. The vulnerability affects all versions of Red Hat Enterprise Linux 10 that use libaom with SVC encoding enabled. Exploitation requires no privileges or user interaction but does require the target service to process attacker-controlled video frames.
Potential Impact
Successful exploitation allows remote attackers to execute arbitrary code on affected systems without privileges or user interaction. This can lead to complete system compromise, including confidentiality, integrity, and availability impacts. The CVSS v3.1 base score is 8.1, indicating high severity with network attack vector, high impact on confidentiality, integrity, and availability, and high attack complexity.
Mitigation Recommendations
Patch status is not yet confirmed — check the Red Hat advisory at https://access.redhat.com/security/cve/CVE-2026-56211 for current remediation guidance. Until an official fix is available, mitigate exposure by disabling or restricting services that use libaom with SVC encoding enabled and do not require processing untrusted video frames. Monitor vendor communications for updates.
CVE-2026-56211: Out-of-bounds Write in Red Hat Red Hat Enterprise Linux 10
Description
CVE-2026-56211 is a high-severity remote code execution vulnerability in libaom, the AV1 codec implementation used in Red Hat Enterprise Linux 10. It arises from insufficient bounds validation in the AV1 encoder's SVC layer ID control, allowing crafted video frames to overwrite internal encoder structures. Exploitation requires a service using libaom with SVC encoding enabled that accepts attacker-supplied video frames. No official patch or remediation guidance is currently provided by Red Hat.
CVSS v3.1
Score 8.1high
Affected software
Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in libaom's AV1 encoder involves an out-of-bounds write due to improper bounds checking of the SVC layer ID control. An attacker can supply specially crafted video frame pixels that overlap with internal encoder layer context structures. In fork-based video processing services, this can lead to hijacking the cyclic refresh map pointer, brute forcing the process base address via a crash oracle, and redirecting control flow to achieve arbitrary command execution. The vulnerability affects all versions of Red Hat Enterprise Linux 10 that use libaom with SVC encoding enabled. Exploitation requires no privileges or user interaction but does require the target service to process attacker-controlled video frames.
Potential Impact
Successful exploitation allows remote attackers to execute arbitrary code on affected systems without privileges or user interaction. This can lead to complete system compromise, including confidentiality, integrity, and availability impacts. The CVSS v3.1 base score is 8.1, indicating high severity with network attack vector, high impact on confidentiality, integrity, and availability, and high attack complexity.
Mitigation Recommendations
Patch status is not yet confirmed — check the Red Hat advisory at https://access.redhat.com/security/cve/CVE-2026-56211 for current remediation guidance. Until an official fix is available, mitigate exposure by disabling or restricting services that use libaom with SVC encoding enabled and do not require processing untrusted video frames. Monitor vendor communications for updates.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- redhat
- Date Reserved
- 2026-06-19T15:50:16.801Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2026-56211","vendor":"Red Hat"}]
Threat ID: 6a3576d1f198dc38c1c38f51
Added to database: 6/19/2026, 5:05:21 PM
Last enriched: 6/19/2026, 5:20:01 PM
Last updated: 6/19/2026, 6:15:15 PM
Views: 5
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.