CVE-2026-19548 Red Hat CVE debrief

Who should care

Developers and administrators of build environments using LTO-enabled linking, especially those using Red Hat Enterprise Linux and OpenShift Container Platform, should assess their exposure and apply vendor patches or updates for binutils. They should also monitor build processes for unusual behavior or crashes and consider compensating controls such as restricting access to build environments. Additionally, they should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance, and plan vendor-supported updates or mitigations through normal change control where exposure is confirmed. Compensating controls for exposed systems should be reviewed while remediation is scheduled and verified, and relevant monitoring, detection, and logs for exposed assets should be checked for extra review. Exceptions, retested remediated assets, and closed items should be tracked only after evidence is documented. Asset inventory and source tracking should also be considered to ensure comprehensive vulnerability management. Security teams should prioritize patching and vulnerability management for build environments, and verify that build processes are properly secured and monitored to prevent potential exploitation. This may involve reviewing current build environment configurations, identifying potential vulnerabilities, and implementing additional security controls as needed. Furthermore, it is essential to ensure that all stakeholders, including developers, administrators, and security teams, are aware of the potential risks and take necessary precautions to prevent exploitation. This includes providing training and resources to help stakeholders understand the vulnerability and its potential impact, as well as ensuring that they have the necessary information and support to implement effective mitigations. By taking a proactive and comprehensive approach to vulnerability management, organizations can reduce the risk of exploitation and minimize the potential impact of a successful attack. Effective communication and collaboration between stakeholders is crucial to ensure that all necessary steps are taken to prevent potential

Technical summary

The root cause of the vulnerability is that plugin_maybe_claim() in ld/plugin.c frees the original BFD object via bfd_close/_bfd_delete_bfd when entry->the_bfd->my_archive == NULL, but the caller retains both the original abfd parameter and a shallow copy (orig_input.the_bfd) as dangling pointers. These dangling pointers are subsequently dereferenced at three distinct locations in add_archive_element. The vulnerability is triggered when LTO plugins are active and the input object has abfd->my_archive == NULL, which is a valid state for standalone object files.

Defensive priority

Medium-priority vulnerability in a development tool, with limited attack surface.

Recommended defensive actions

• Inventory and assess exposure of build environments using LTO-enabled linking
• Apply vendor patches or updates for binutils
• Monitor build processes for unusual behavior or crashes
• Consider compensating controls such as restricting access to build environments
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

Multiple Use-After-Free vulnerabilities were found in the add_archive_element function in ld/ldmain.c of the GNU linker (ld). The root cause is that plugin_maybe_claim() in ld/plugin.c frees the original BFD object via bfd_close/_bfd_delete_bfd when entry->the_bfd->my_archive == NULL, but the caller retains both the original abfd parameter and a shallow copy (orig_input.the_bfd) as dangling pointers.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.