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Linux Distros Unpatched Vulnerability : CVE-2026-91781

🗓️ 23 Sep 2026 00:00:00Reported by TenableType 
nessus
 nessus🔗 www.tenable.com👁 8 Views

Local null pointer dereference in GNU Binutils 2.47 ELF Section Handler.

Related
Refs
Code
ReporterTitlePublishedViews
Family
cve
CVE		CVE-2026-91781
15 Sep 202608:45
–cve
cvelist
Cvelist		CVE-2026-91781 GNU Binutils ELF Section elf64-x86-64.c elf_x86_64_common_section_index null pointer dereference
15 Sep 202608:45
–cvelist
debiancve
Debian CVE		CVE-2026-91781
15 Sep 202608:45
–debiancve
euvd
EUVD		EUVD-2026-78329
15 Sep 202608:45
–euvd
mscve
Microsoft CVE		GNU Binutils ELF Section elf64-x86-64.c elf_x86_64_common_section_index null pointer dereference
21 Sep 202608:03
–mscve
nvd
NVD		CVE-2026-91781
15 Sep 202609:16
–nvd
osv
OSV		AZL-103368 CVE-2026-91781 affecting package binutils 2.41-13
15 Sep 202609:16
–osv
osv
OSV		CGA-2WFW-W4P7-55X5
17 Sep 202613:08
–osv
osv
OSV		CGA-45Q9-CX9R-FXPH
17 Sep 202614:10
–osv
osv
OSV		CGA-4GH6-J735-8HQW
17 Sep 202612:39
–osv
Rows per page
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

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  script_set_attribute(attribute:"synopsis", value:
"The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be
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.

  - A security vulnerability has been detected in GNU Binutils 2.47. Affected is the function
    elf_x86_64_common_section_index of the file bfd/elf64-x86-64.c of the component ELF Section Handler. The
    manipulation leads to null pointer dereference. The attack needs to be performed locally. The exploit has
    been disclosed publicly and may be used. Upgrading to version 2.48 is able to address this issue. The
    identifier of the patch is 7322e9bc30cb282575a701c307851fd3d66fee68. It is suggested to upgrade the
    affected component. (CVE-2026-91781)

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-2026-91781");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2026-91781");
  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:L/AC:L/Au:S/C:N/I:N/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:L/UI:N/S:U/C:N/I:N/A:L");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:U/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:P");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-91781");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"vendor_unpatched", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/09/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/23");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:14.04:-:lts");
  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: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");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:binutils");
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  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

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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);

include('linux_unpatched.inc');

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          {"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"}
        ]
      }
    ]
  },
  "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_NOTE,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}

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4.4Medium risk
Vulners AI Score4.4
CVSS 21.7
CVSS 3.13.3
CVSS 33.3
CVSS 44.8
EPSS0.00175
SSVC
GNU BinutilsELF Section Handlernull pointer dereferencelocal attackelf_x86_64_common_section_index
8