| Reporter | Title | Published | Views | Family All 13 |
|---|---|---|---|---|
| CVE-2026-55950 | 2 Jul 202616:06 | – | attackerkb | |
| CVE-2026-55950 | 2 Jul 202619:30 | – | circl | |
| CVE-2026-55950 | 2 Jul 202616:06 | – | cve | |
| CVE-2026-55950 DTLS listener crash via race condition in dtls_packet_demux causes denial of service for all sessions | 2 Jul 202616:06 | – | cvelist | |
| CVE-2026-55950 | 2 Jul 202616:06 | – | debiancve | |
| EUVD-2026-41414 | 2 Jul 202616:06 | – | euvd | |
| CVE-2026-55950 | 2 Jul 202617:17 | – | nvd | |
| DEBIAN-CVE-2026-55950 | 2 Jul 202617:17 | – | osv | |
| EEF-CVE-2026-55950 DTLS listener crash via race condition in dtls_packet_demux causes denial of service for all sessions | 2 Jul 202616:06 | – | osv | |
| UBUNTU-CVE-2026-55950 | 3 Jul 202600:00 | – | osv |
| Source | Link |
|---|---|
| security-tracker | www.security-tracker.debian.org/tracker/CVE-2026-55950 |
| ubuntu | www.ubuntu.com/security/CVE-2026-55950 |
| cve | www.cve.mitre.org/cgi-bin/cvename.cgi |
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##
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script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-55950");
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patch available.
- Time-of-check Time-of-use (TOCTOU) race condition vulnerability in Erlang/OTP ssl (dtls_packet_demux
module) allows an unauthenticated remote attacker to crash all active DTLS sessions on a listener. A DTLS
server listener uses a single shared dtls_packet_demux gen_server process to route incoming UDP datagrams
to the correct connection handler. When a DTLS client reconnects rapidly from the same source address and
port (sending multiple ClientHello messages in quick succession), a race condition in the demux's internal
gb_trees key-value store causes a {key_exists, {old, Client}} crash, terminating the demux process.
Because the demux is shared across all DTLS associations on that listener, its crash immediately kills
every active DTLS session, not just the attacker's. The attack is pre-authentication: the attacker only
needs to send UDP datagrams containing valid ClientHello messages from the same source IP and port before
the intermediate DOWN monitor message is processed by the gen_server. No credentials, no completed
handshake, and no special configuration are required, and the crash can be repeated indefinitely to create
a persistent denial of service for all clients of that listener. This vulnerability is associated with
program file lib/ssl/src/dtls_packet_demux.erl. This issue affects OTP from OTP 25.3 before 29.0.3,
28.5.0.3, and 27.3.4.14 corresponding to ssl from 10.9 before 11.7.3, 11.6.0.3, and 11.2.12.10.
(CVE-2026-55950)
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script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:P");
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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");
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exit(0);
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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 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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