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With package: bintoolsDualAs

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Permalink CVE-2026-19548
5.5 MEDIUM
  • CVSS version (CVSS): 3.1
  • Attack Vector (AV): Local (L)
  • Attack Complexity (AC): Low (L)
  • Privileges Required (PR): None (N)
  • User Interaction (UI): Required (R)
  • Scope (S): Unchanged (U)
  • Confidentiality (C): None (N)
  • Integrity (I): None (N)
  • Availability (A): High (H)
  • Modified Attack Vector (MAV): Local (L)
  • Modified Attack Complexity (MAC): Low (L)
  • Modified Privileges Required (MPR): None (N)
  • Modified User Interaction (MUI): Required (R)
  • Modified Confidentiality (MC): None (N)
  • Modified Scope (MS): Unchanged (U)
  • Modified Integrity (MI): None (N)
  • Modified Availability (MA): High (H)
updated 1 month, 1 week ago by @LeSuisse Activity log
  • Created suggestion
  • @LeSuisse ignored package bintools
Binutils: binutils: multiple use-after-free in add_archive_element via lto plugin processing

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.

References

Affected products

rhcos
binutils
mingw-binutils
gcc-toolset-14-binutils
gcc-toolset-15-binutils
gcc-toolset-16-binutils

Matching in nixpkgs

pkgs.binutils

Tools for manipulating binaries (linker, assembler, etc.) (wrapper script)

  • nixos-unstable -
    • nixos-unstable-small 2.46
  • nixos-26.05 -
    • nixos-26.05-small 2.46

pkgs.bintoolsNoLibc

Tools for manipulating binaries (linker, assembler, etc.) (wrapper script)

  • nixos-unstable -
    • nixos-unstable-small 2.46
  • nixos-26.05 -
    • nixos-26.05-small 2.46

pkgs.binutilsNoLibc

Tools for manipulating binaries (linker, assembler, etc.) (wrapper script)

  • nixos-unstable -
    • nixos-unstable-small 2.46
  • nixos-26.05 -
    • nixos-26.05-small 2.46

pkgs.cargo-binutils

Cargo subcommands to invoke the LLVM tools shipped with the Rust toolchain

  • nixos-unstable -
    • nixos-unstable-small 0.4.0
  • nixos-26.05 -
    • nixos-26.05-small 0.4.0

pkgs.binutils_nogold

Tools for manipulating binaries (linker, assembler, etc.) (wrapper script)

  • nixos-unstable -
    • nixos-unstable-small 2.46
  • nixos-26.05 -
    • nixos-26.05-small 2.46

pkgs.darwin.binutils

System binary utilities (wrapper script)

  • nixos-unstable -
  • nixos-26.05 -

pkgs.bintools-unwrapped

Tools for manipulating binaries (linker, assembler, etc.)

  • nixos-unstable -
    • nixos-unstable-small 2.46
  • nixos-26.05 -
    • nixos-26.05-small 2.46

pkgs.binutils-unwrapped

Tools for manipulating binaries (linker, assembler, etc.)

  • nixos-unstable -
    • nixos-unstable-small 2.46
  • nixos-26.05 -
    • nixos-26.05-small 2.46

pkgs.binutils-unwrapped_2_38

Tools for manipulating binaries (linker, assembler, etc.)

  • nixos-unstable -
    • nixos-unstable-small 2.38
  • nixos-26.05 -
    • nixos-26.05-small 2.38
Ignored packages (1)

pkgs.bintools

Tools for manipulating binaries (linker, assembler, etc.) (wrapper script)

  • nixos-unstable -
    • nixos-unstable-small 2.46
  • nixos-26.05 -
    • nixos-26.05-small 2.46