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Linux Distros Unpatched Vulnerability : CVE-2026-18220

🗓️ 29 Jul 2026 00:00:00Reported by TenableType 
nessus
 nessus🔗 www.tenable.com👁 4 Views

Unpatched Linux/Unix host vulnerable to out-of-bounds write in binutils DLX ELF backend (CVE-2026-18220).

Related
Refs
Code
ReporterTitlePublishedViews
Family
attackerkb
ATTACKERKB		CVE-2026-18220
29 Jul 202609:47
–attackerkb
circl
Circl		CVE-2026-18220
29 Jul 202615:00
–circl
cve
CVE		CVE-2026-18220
29 Jul 202609:47
–cve
cvelist
Cvelist		CVE-2026-18220 Binutils: binutils: out-of-bounds write in bfd dlx elf backend relocation processing
29 Jul 202609:47
–cvelist
debiancve
Debian CVE		CVE-2026-18220
29 Jul 202609:47
–debiancve
euvd
EUVD		EUVD-2026-50279
29 Jul 202609:47
–euvd
nvd
NVD		CVE-2026-18220
29 Jul 202611:16
–nvd
osv
OSV		DEBIAN-CVE-2026-18220
29 Jul 202611:16
–osv
osv
OSV		ECHO-2327-9760-E268
30 Jul 202607:51
–osv
osv
OSV		UBUNTU-CVE-2026-18220
30 Jul 202600:00
–osv
Rows per page
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

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patched.");
  script_set_attribute(attribute:"description", value:
"The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied
patch available.

  - An out-of-bounds write vulnerability was found in the BFD library's DLX ELF backend (bfd/elf32-dlx.c) in
    GNU binutils. The dlx_rtype_to_howto() function maps ELF relocation types to internal howto structures but
    fails to perform adequate bounds checking on attacker-controlled relocation type values (via
    ELF32_R_TYPE(r_info)) before indexing into the dlx_elf_howto_table[] array. The DLX relocation type number
    space is non-contiguous (basic types 0-6, extended types at 0x10000+), but the default case in the switch
    statement allows arbitrary index values to reach the array access. A specially crafted ELF/DLX object file
    can trigger this out-of-bounds write when processed by any BFD-consuming tool (objdump, readelf, strip,
    ld, nm, objcopy). The vulnerability has been demonstrated to achieve arbitrary code execution via a File
    Stream Oriented Programming (FSOP) attack against glibc FILE structures (stderr), redirecting control flow
    to system(). Attack scenarios include CI/CD pipelines performing automated binary analysis, developer
    workstations running objdump/readelf on untrusted binaries, automated security scanning or malware
    analysis tools invoking binutils, and package build systems processing third-party code. Note: This
    vulnerability is only exploitable when binutils is built with the DLX backend enabled (typically via
    --enable-targets=all). (CVE-2026-18220)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-18220");
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  script_set_attribute(attribute:"solution", value:
"There is no known solution at this time.");
  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:U/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:U/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-18220");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
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  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:20.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:22.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:24.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:26.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:11.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:12.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:13.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:14.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:binutils");
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  exit(0);
}

if (!get_kb_item("global_settings/vendor_unpatched")) exit(0, "Unpatched Vulnerabilities Detection not active.");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (empty_or_null(get_one_kb_item("Host/Debian/dpkg-l"))) audit(AUDIT_PACKAGE_LIST_MISSING);

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          {"reference": "binutils-hppa-linux-gnu"},
          {"reference": "binutils-hppa64-linux-gnu"},
          {"reference": "binutils-m68k-linux-gnu"},
          {"reference": "binutils-mips-linux-gnu"},
          {"reference": "binutils-mips64-linux-gnuabi64"},
          {"reference": "binutils-mips64el-linux-gnuabi64"},
          {"reference": "binutils-mipsel-linux-gnu"},
          {"reference": "binutils-multiarch"},
          {"reference": "binutils-multiarch-dev"},
          {"reference": "binutils-powerpc-linux-gnu"},
          {"reference": "binutils-powerpc-linux-gnuspe"},
          {"reference": "binutils-powerpc64-linux-gnu"},
          {"reference": "binutils-powerpc64le-linux-gnu"},
          {"reference": "binutils-s390x-linux-gnu"},
          {"reference": "binutils-sh4-linux-gnu"},
          {"reference": "binutils-source"},
          {"reference": "binutils-sparc64-linux-gnu"}
        ]
      }
    ]
  },
  "Ubuntu Linux-18.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "18.04",
        "pkgs": [
          {"reference": "binutils"},
          {"reference": "binutils-aarch64-linux-gnu"},
          {"reference": "binutils-aarch64-linux-gnu-dbg"},
          {"reference": "binutils-alpha-linux-gnu"},
          {"reference": "binutils-alpha-linux-gnu-dbg"},
          {"reference": "binutils-arm-linux-gnueabi"},
          {"reference": "binutils-arm-linux-gnueabi-dbg"},
          {"reference": "binutils-arm-linux-gnueabihf"},
          {"reference": "binutils-arm-linux-gnueabihf-dbg"},
          {"reference": "binutils-common"},
          {"reference": "binutils-dev"},
          {"reference": "binutils-doc"},
          {"reference": "binutils-for-build"},
          {"reference": "binutils-for-host"},
          {"reference": "binutils-hppa-linux-gnu"},
          {"reference": "binutils-hppa-linux-gnu-dbg"},
          {"reference": "binutils-hppa64-linux-gnu"},
          {"reference": "binutils-hppa64-linux-gnu-dbg"},
          {"reference": "binutils-i686-linux-gnu"},
          {"reference": "binutils-i686-linux-gnu-dbg"},
          {"reference": "binutils-mips-linux-gnu"},
          {"reference": "binutils-mips-linux-gnu-dbg"},
          {"reference": "binutils-mips64el-linux-gnuabi64"},
          {"reference": "binutils-mips64el-linux-gnuabi64-dbg"},
          {"reference": "binutils-mipsel-linux-gnu"},
          {"reference": "binutils-mipsel-linux-gnu-dbg"},
          {"reference": "binutils-multiarch"},
          {"reference": "binutils-multiarch-dbg"},
          {"reference": "binutils-multiarch-dev"},
          {"reference": "binutils-powerpc64le-linux-gnu"},
          {"reference": "binutils-powerpc64le-linux-gnu-dbg"},
          {"reference": "binutils-s390x-linux-gnu"},
          {"reference": "binutils-s390x-linux-gnu-dbg"},
          {"reference": "binutils-source"},
          {"reference": "binutils-x86-64-linux-gnu"},
          {"reference": "binutils-x86-64-linux-gnu-dbg"},
          {"reference": "libbinutils"},
          {"reference": "libbinutils-dbg"}
        ]
      }
    ]
  },
  "Ubuntu Linux-24.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "24.04",
        "pkgs": [
          {"reference": "binutils"},
          {"reference": "binutils-aarch64-linux-gnu"},
          {"reference": "binutils-aarch64-linux-gnu-dbg"},
          {"reference": "binutils-alpha-linux-gnu"},
          {"reference": "binutils-alpha-linux-gnu-dbg"},
          {"reference": "binutils-arc-linux-gnu"},
          {"reference": "binutils-arc-linux-gnu-dbg"},
          {"reference": "binutils-arm-linux-gnueabi"},
          {"reference": "binutils-arm-linux-gnueabi-dbg"},
          {"reference": "binutils-arm-linux-gnueabihf"},
          {"reference": "binutils-arm-linux-gnueabihf-dbg"},
          {"reference": "binutils-common"},
          {"reference": "binutils-dev"},
          {"reference": "binutils-doc"},
          {"reference": "binutils-for-build"},
          {"reference": "binutils-for-host"},
          {"reference": "binutils-hppa-linux-gnu"},
          {"reference": "binutils-hppa-linux-gnu-dbg"},
          {"reference": "binutils-hppa64-linux-gnu"},
          {"reference": "binutils-hppa64-linux-gnu-dbg"},
          {"reference": "binutils-i686-linux-gnu"},
          {"reference": "binutils-i686-linux-gnu-dbg"},
          {"reference": "binutils-multiarch"},
          {"reference": "binutils-multiarch-dbg"},
          {"reference": "binutils-multiarch-dev"},
          {"reference": "binutils-powerpc64le-linux-gnu"},
          {"reference": "binutils-powerpc64le-linux-gnu-dbg"},
          {"reference": "binutils-s390x-linux-gnu"},
          {"reference": "binutils-s390x-linux-gnu-dbg"},
          {"reference": "binutils-source"},
          {"reference": "binutils-x86-64-linux-gnu"},
          {"reference": "binutils-x86-64-linux-gnu-dbg"},
          {"reference": "libbinutils"},
          {"reference": "libbinutils-dbg"},
          {"reference": "libctf-nobfd0"},
          {"reference": "libctf-nobfd0-dbg"},
          {"reference": "libctf0"},
          {"reference": "libctf0-dbg"},
          {"reference": "libgprofng0"},
          {"reference": "libgprofng0-dbg"},
          {"reference": "libsframe1"},
          {"reference": "libsframe1-dbg"}
        ]
      }
    ]
  }
};

var distro_constraints_values = linux_unpatched::get_distro_constraints(distro_constraints_arr:distro_constraints_array);
if (empty_or_null(distro_constraints_values)) audit(AUDIT_HOST_NOT, 'affected');

var third_party_support = get_kb_item('Host/OS/extended-third-party');
if (!empty_or_null(third_party_support)) {
    var third_party_vendors = distro_constraints_values['third_party'];
    if (!empty_or_null(third_party_vendors)) {
        var vendor;
        foreach vendor (third_party_vendors) {
            if (vendor == third_party_support) exit(0, 'A third party management patch is available for this vulnerability from ' + vendor + '.\n');
        }
    }
}

var report = linux_unpatched::check_unpatched_constraints(distro_constraints_values:distro_constraints_values);

if (!empty_or_null(report))
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}

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30 Jul 2026 00:00Current
6.4Medium risk
Vulners AI Score6.4
CVSS 3.17.8
EPSS0.00186
SSVC
linuxunpatchedvulnerabilitybinutilsdlx elf backendcve-2026-18220
4