CVE-2026-19548 (GCVE-0-2026-19548)

Vulnerability from cvelistv5 – Published: 2026-08-12 15:51 – Updated: 2026-11-06 07:42
VLAI
Title
Binutils: binutils: multiple use-after-free in add_archive_element via lto plugin processing
Summary
Multiple Use-After-Free vulnerabilities were found in the add_archive_element function in ld/ldmain.c of the GNU linker (ld), a component of binutils. 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. These dangling pointers are subsequently dereferenced at three distinct locations in add_archive_element: 1. Line ~1442: accessing abfd->my_archive via bfd_usrdata(abfd->my_archive) 2. Line ~1493: multiple accesses to abfd and abfd->my_archive in a conditional check and bfd_get_filename call 3. Line ~1525: dereferencing the shallow copy orig_input.the_bfd->my_archive in trace/verbose logging The vulnerability is triggered when LTO plugins are active (link_info.lto_plugin_active is true) and the input object has abfd->my_archive == NULL, which is a valid state for standalone object files. Red Hat builds binutils with --enable-plugins and --enable-lto, confirming the vulnerable code path is compiled in and reachable. An attacker who can supply a crafted object or archive file to a build process using LTO-enabled linking could exploit this flaw to cause a denial of service (linker crash via segmentation fault). Arbitrary code execution is theoretically possible through heap manipulation but is substantially mitigated by hardening measures including stack protector, FORTIFY_SOURCE, ASLR, and PIE. The attack surface is limited to build-time environments — the linker is a development tool not exposed in production runtime. The most realistic exploitation scenario is a supply chain attack introducing a crafted object file as a build dependency in CI/CD pipelines or development environments.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-12 16:52 UTC
CWE
Assigner
redhat CNA under the redhat root
CNA scorecard B 82/100 over 1204 records in the last 180 days details
References
URL Tags
https://access.redhat.com/errata/RHSA-2026:82359 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-19548 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2507832 issue-trackingx_refsource_REDHAT
Impacted products
Date Public
2026-08-12 13:40
Credits
Red Hat would like to thank Xuqing Yang (Individual Security Researcher (rigelyoung@icloud.com)) for reporting this issue.
Show details on NVD website
To clipboard 

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}



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