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Linux Distros Unpatched Vulnerability : CVE-2026-42792

🗓️ 28 Jul 2026 00:00:00Reported by TenableType 
nessus
 nessus
🔗 www.tenable.com👁 3 Views

Unpatched Linux hosts face CVE-2026-42792; remote epmd termination via descriptor exhaustion; no per-source-IP cap.

Related
Refs
Code
ReporterTitlePublishedViews
Family
freebsd
FreeBSD
Erlang/OTP -- denial of service in epmd
27 Jul 202600:00
freebsd
attackerkb
ATTACKERKB
CVE-2026-42792
27 Jul 202614:58
attackerkb
cve
CVE
CVE-2026-42792
27 Jul 202614:58
cve
cvelist
Cvelist
CVE-2026-42792 epmd permanent DoS via EMFILE on accept(2) in erts
27 Jul 202614:58
cvelist
debiancve
Debian CVE
CVE-2026-42792
27 Jul 202614:58
debiancve
euvd
EUVD
EUVD-2026-49316
27 Jul 202614:58
euvd
nessus
Tenable Nessus
FreeBSD : Erlang/OTP -- denial of service in epmd (445e3324-89e1-11f1-b35c-4c526214c986)
28 Jul 202600:00
nessus
nvd
NVD
CVE-2026-42792
27 Jul 202616:17
nvd
osv
OSV
CVE-2026-42792 epmd permanent DoS via EMFILE on accept(2) in erts
27 Jul 202614:58
osv
osv
OSV
DEBIAN-CVE-2026-42792
27 Jul 202616:17
osv
Rows per page
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##
# (C) Tenable, Inc.
##

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  - Improper Handling of Exceptional Conditions vulnerability in Erlang OTP erts (epmd) allows an
    unauthenticated remote attacker to permanently terminate the Erlang Port Mapper Daemon (epmd) via
    connection slot exhaustion. The do_accept function in erts/epmd/src/epmd_srv.c calls epmd_cleanup_exit()
    when accept(2) returns EMFILE (per-process file descriptor limit reached) or ENFILE (system-wide file
    descriptor limit reached), rather than treating these as recoverable conditions. An attacker can exhaust
    epmd's file descriptor slots by holding many TCP connections open while periodically sending a single byte
    to reset the idle timeout, then causing accept(2) to return EMFILE, which kills the daemon. epmd has no
    per-source-IP connection cap, making the attack feasible from a single source. On Debian/Ubuntu default
    packaging the impact is amplified: the systemd unit inherits a low file descriptor soft limit, and
    repeated daemon deaths trigger systemd's start-rate-limit, permanently failing both epmd.service and
    epmd.socket and requiring manual operator intervention to recover. This issue affects OTP from OTP 17.0
    before OTP 29.0.4, OTP 28.5.0.4 and OTP 27.3.4.15. (CVE-2026-42792)

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          {"reference": "erlang-crypto"},
          {"reference": "erlang-dbg"},
          {"reference": "erlang-debugger"},
          {"reference": "erlang-dev"},
          {"reference": "erlang-dialyzer"},
          {"reference": "erlang-diameter"},
          {"reference": "erlang-doc"},
          {"reference": "erlang-edoc"},
          {"reference": "erlang-eldap"},
          {"reference": "erlang-erl-docgen"},
          {"reference": "erlang-et"},
          {"reference": "erlang-eunit"},
          {"reference": "erlang-examples"},
          {"reference": "erlang-gs"},
          {"reference": "erlang-ic"},
          {"reference": "erlang-ic-java"},
          {"reference": "erlang-inets"},
          {"reference": "erlang-jinterface"},
          {"reference": "erlang-manpages"},
          {"reference": "erlang-megaco"},
          {"reference": "erlang-mnesia"},
          {"reference": "erlang-mode"},
          {"reference": "erlang-nox"},
          {"reference": "erlang-observer"},
          {"reference": "erlang-odbc"},
          {"reference": "erlang-os-mon"},
          {"reference": "erlang-parsetools"},
          {"reference": "erlang-percept"},
          {"reference": "erlang-public-key"},
          {"reference": "erlang-reltool"},
          {"reference": "erlang-runtime-tools"},
          {"reference": "erlang-snmp"},
          {"reference": "erlang-src"},
          {"reference": "erlang-ssh"},
          {"reference": "erlang-ssl"},
          {"reference": "erlang-syntax-tools"},
          {"reference": "erlang-test-server"},
          {"reference": "erlang-tools"},
          {"reference": "erlang-typer"},
          {"reference": "erlang-webtool"},
          {"reference": "erlang-wx"},
          {"reference": "erlang-x11"},
          {"reference": "erlang-xmerl"}
        ]
      }
    ]
  },
  "Ubuntu Linux-18.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "18.04",
        "pkgs": [
          {"reference": "erlang"},
          {"reference": "erlang-asn1"},
          {"reference": "erlang-base"},
          {"reference": "erlang-base-hipe"},
          {"reference": "erlang-common-test"},
          {"reference": "erlang-corba"},
          {"reference": "erlang-crypto"},
          {"reference": "erlang-debugger"},
          {"reference": "erlang-dev"},
          {"reference": "erlang-dialyzer"},
          {"reference": "erlang-diameter"},
          {"reference": "erlang-doc"},
          {"reference": "erlang-edoc"},
          {"reference": "erlang-eldap"},
          {"reference": "erlang-erl-docgen"},
          {"reference": "erlang-et"},
          {"reference": "erlang-eunit"},
          {"reference": "erlang-examples"},
          {"reference": "erlang-ic"},
          {"reference": "erlang-ic-java"},
          {"reference": "erlang-inets"},
          {"reference": "erlang-jinterface"},
          {"reference": "erlang-manpages"},
          {"reference": "erlang-megaco"},
          {"reference": "erlang-mnesia"},
          {"reference": "erlang-mode"},
          {"reference": "erlang-nox"},
          {"reference": "erlang-observer"},
          {"reference": "erlang-odbc"},
          {"reference": "erlang-os-mon"},
          {"reference": "erlang-parsetools"},
          {"reference": "erlang-public-key"},
          {"reference": "erlang-reltool"},
          {"reference": "erlang-runtime-tools"},
          {"reference": "erlang-snmp"},
          {"reference": "erlang-src"},
          {"reference": "erlang-ssh"},
          {"reference": "erlang-ssl"},
          {"reference": "erlang-syntax-tools"},
          {"reference": "erlang-tools"},
          {"reference": "erlang-wx"},
          {"reference": "erlang-x11"},
          {"reference": "erlang-xmerl"}
        ]
      }
    ]
  }
};

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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28 Jul 2026 00:00Current
6Medium risk
Vulners AI Score6
CVSS 46.3
EPSS0.00387
SSVC
3