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Linux Distros Unpatched Vulnerability : CVE-2026-84782
high Nessus Plugin ID 351165
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Synopsis
The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be patched.Description
The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.- Issue summary: The DTLS retransmission logic does not correctly handle a handshake message write that is suspended part-way through. The retransmitted message can be read past the message buffer and the retransmission overwrites the internal state the suspended write needs to resume correctly. Impact summary: The retransmitted message can disclose a heap memory to the peer as plaintext handshake data or cause a crash and a Denial of Service when the read reaches an unmapped memory region. CWE: CWE-125: Out- of-bounds Read Description: DTLS handshake messages can be written out in multiple fragments, and a write can suspend mid-message (returning WANT_WRITE) if the underlying transport temporarily cannot accept more data. While such a write is suspended, the DTLS retransmission timer may independently fire and ask the retransmission logic to resend an earlier, already-acknowledged-as-sent message from its retransmit queue.
The retransmission logic reused the same internal buffer and position tracking as the message that was still being written, without resetting the position back to the start of the message being retransmitted.
As a result the retransmission was read starting from wherever the suspended write had left off, producing a mislabelled message whose body was leftover bytes from the other, larger message still in flight - content that was never meant to be sent at that point, and which could run past the end of the allocated buffer. Separately, even when the retransmission is positioned correctly, allowing it to run to completion while another write is suspended overwrites the same shared bookkeeping that the suspended write depends on to resume. When the application later resumes the suspended write (via a subsequent SSL_read(), SSL_write(), SSL_accept(), or SSL_connect() call), it finds that bookkeeping in a state inconsistent with the message and aborts the process in a debugging build. The fix resets the retransmission's read position to the start of the message before resending, and skips retransmission entirely whenever a handshake write is still suspended, deferring to the next call that resumes it instead. FIPS impact: no The affected code is outside the FIPS module boundary. (CVE-2026-84782)
Note that Nessus relies on the presence of the package as reported by the vendor.
Solution
There is no known solution at this time.See Also
https://access.redhat.com/security/cve/cve-2026-84782
Plugin Details
Severity: High
ID: 351165
File Name: unpatched_CVE_2026_84782.nasl
Version: 1.9
Type: Local
Agent: unix
Family: Misc.
Published: 9/29/2026
Updated: 10/8/2026
Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 6.5
Percentile: 96.38
CVSS v2
Risk Factor: Medium
Base Score: 6.4
Temporal Score: 5.4
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:P
CVSS Score Source: CVE-2026-84782
CVSS v3
Risk Factor: High
Base Score: 8.2
Temporal Score: 7.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Temporal Vector: CVSS:3.0/E:U/RL:U/RC:C
Vulnerability Information
CPE: cpe:/o:canonical:ubuntu_linux:16.04:-:lts, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, cpe:/o:canonical:ubuntu_linux:26.04:-:lts, cpe:/o:centos:centos:7, cpe:/o:centos:centos:8, cpe:/o:debian:debian_linux:12.0, cpe:/o:debian:debian_linux:14.0, cpe:/o:redhat:enterprise_linux:10, cpe:/o:redhat:enterprise_linux:6, cpe:/o:redhat:enterprise_linux:7, cpe:/o:redhat:enterprise_linux:8, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:canonical:ubuntu_linux:edk2-hwe, p-cpe:/a:canonical:ubuntu_linux:edk2, p-cpe:/a:canonical:ubuntu_linux:nodejs, p-cpe:/a:centos:centos:aavmf, p-cpe:/a:centos:centos:bootc, p-cpe:/a:centos:centos:clevis-pin-tpm2, p-cpe:/a:centos:centos:compat-openssl10, p-cpe:/a:centos:centos:compat-openssl11, p-cpe:/a:centos:centos:edk2-aarch64, p-cpe:/a:centos:centos:edk2-ovmf, p-cpe:/a:centos:centos:edk2-tools-doc, p-cpe:/a:centos:centos:edk2-tools, p-cpe:/a:centos:centos:edk2, p-cpe:/a:centos:centos:firefox-x11, p-cpe:/a:centos:centos:firefox, p-cpe:/a:centos:centos:glx-utils, p-cpe:/a:centos:centos:mesa-demos, p-cpe:/a:centos:centos:mesa-dri-drivers, p-cpe:/a:centos:centos:mesa-filesystem, p-cpe:/a:centos:centos:mesa-libegl-devel, p-cpe:/a:centos:centos:mesa-libegl, p-cpe:/a:centos:centos:mesa-libgbm-devel, p-cpe:/a:centos:centos:mesa-libgbm, p-cpe:/a:centos:centos:mesa-libgl-devel, p-cpe:/a:centos:centos:mesa-libgl, p-cpe:/a:centos:centos:mesa-libglapi, p-cpe:/a:centos:centos:mesa-libglu-devel, p-cpe:/a:centos:centos:mesa-libglu, p-cpe:/a:centos:centos:mesa-libosmesa-devel, p-cpe:/a:centos:centos:mesa-libosmesa, p-cpe:/a:centos:centos:mesa-libxatracker, p-cpe:/a:centos:centos:mesa-vulkan-drivers, p-cpe:/a:centos:centos:mingw-openssl, p-cpe:/a:centos:centos:mingw32-openssl, p-cpe:/a:centos:centos:mingw64-openssl, p-cpe:/a:centos:centos:mokutil, p-cpe:/a:centos:centos:mozjs60-devel, p-cpe:/a:centos:centos:mozjs60, p-cpe:/a:centos:centos:openssl-devel, p-cpe:/a:centos:centos:openssl-libs, p-cpe:/a:centos:centos:openssl-perl, p-cpe:/a:centos:centos:openssl-static, p-cpe:/a:centos:centos:openssl, p-cpe:/a:centos:centos:ovmf, p-cpe:/a:centos:centos:python3.12-cryptography, p-cpe:/a:centos:centos:rpm-ostree-libs, p-cpe:/a:centos:centos:rpm-ostree, p-cpe:/a:centos:centos:s390utils-base, p-cpe:/a:centos:centos:s390utils-chreipl-fcp-mpath, p-cpe:/a:centos:centos:s390utils-cmsfs-fuse, p-cpe:/a:centos:centos:s390utils-core, p-cpe:/a:centos:centos:s390utils-cpacfstatsd, p-cpe:/a:centos:centos:s390utils-cpuplugd, p-cpe:/a:centos:centos:s390utils-devel, p-cpe:/a:centos:centos:s390utils-hmcdrvfs, p-cpe:/a:centos:centos:s390utils-iucvterm, p-cpe:/a:centos:centos:s390utils-mon_statd, p-cpe:/a:centos:centos:s390utils-osasnmpd, p-cpe:/a:centos:centos:s390utils-se-data, p-cpe:/a:centos:centos:s390utils-zdsfs, p-cpe:/a:centos:centos:s390utils-ziomon, p-cpe:/a:centos:centos:s390utils, p-cpe:/a:centos:centos:sevctl, p-cpe:/a:centos:centos:shim-aa64, p-cpe:/a:centos:centos:shim-ia32, p-cpe:/a:centos:centos:shim-signed, p-cpe:/a:centos:centos:shim-x64, p-cpe:/a:centos:centos:shim, p-cpe:/a:centos:centos:system-reinstall-bootc, p-cpe:/a:debian:debian_linux:openssl, p-cpe:/a:redhat:enterprise_linux:aavmf, p-cpe:/a:redhat:enterprise_linux:bootc, p-cpe:/a:redhat:enterprise_linux:clevis-pin-tpm2, p-cpe:/a:redhat:enterprise_linux:compat-openssl10, p-cpe:/a:redhat:enterprise_linux:compat-openssl11, p-cpe:/a:redhat:enterprise_linux:edk2-aarch64, p-cpe:/a:redhat:enterprise_linux:edk2-ovmf, p-cpe:/a:redhat:enterprise_linux:edk2-tools-doc, p-cpe:/a:redhat:enterprise_linux:edk2-tools, p-cpe:/a:redhat:enterprise_linux:edk2, p-cpe:/a:redhat:enterprise_linux:firefox-x11, p-cpe:/a:redhat:enterprise_linux:firefox, p-cpe:/a:redhat:enterprise_linux:glx-utils, p-cpe:/a:redhat:enterprise_linux:mesa-demos, p-cpe:/a:redhat:enterprise_linux:mesa-dri-drivers, p-cpe:/a:redhat:enterprise_linux:mesa-filesystem, p-cpe:/a:redhat:enterprise_linux:mesa-libegl-devel, p-cpe:/a:redhat:enterprise_linux:mesa-libegl, p-cpe:/a:redhat:enterprise_linux:mesa-libgbm-devel, p-cpe:/a:redhat:enterprise_linux:mesa-libgbm, p-cpe:/a:redhat:enterprise_linux:mesa-libgl-devel, p-cpe:/a:redhat:enterprise_linux:mesa-libgl, p-cpe:/a:redhat:enterprise_linux:mesa-libglapi, p-cpe:/a:redhat:enterprise_linux:mesa-libglu-devel, p-cpe:/a:redhat:enterprise_linux:mesa-libglu, p-cpe:/a:redhat:enterprise_linux:mesa-libosmesa-devel, p-cpe:/a:redhat:enterprise_linux:mesa-libosmesa, p-cpe:/a:redhat:enterprise_linux:mesa-libxatracker, p-cpe:/a:redhat:enterprise_linux:mesa-vulkan-drivers, p-cpe:/a:redhat:enterprise_linux:mingw-openssl, p-cpe:/a:redhat:enterprise_linux:mingw32-openssl, p-cpe:/a:redhat:enterprise_linux:mingw64-openssl, p-cpe:/a:redhat:enterprise_linux:mokutil, p-cpe:/a:redhat:enterprise_linux:mozjs60-devel, p-cpe:/a:redhat:enterprise_linux:mozjs60, p-cpe:/a:redhat:enterprise_linux:openssl-devel, p-cpe:/a:redhat:enterprise_linux:openssl-libs, p-cpe:/a:redhat:enterprise_linux:openssl-perl, p-cpe:/a:redhat:enterprise_linux:openssl-static, p-cpe:/a:redhat:enterprise_linux:openssl, p-cpe:/a:redhat:enterprise_linux:ovmf, p-cpe:/a:redhat:enterprise_linux:python3.12-cryptography, p-cpe:/a:redhat:enterprise_linux:rpm-ostree-libs, p-cpe:/a:redhat:enterprise_linux:rpm-ostree, p-cpe:/a:redhat:enterprise_linux:s390utils-base, p-cpe:/a:redhat:enterprise_linux:s390utils-chreipl-fcp-mpath, p-cpe:/a:redhat:enterprise_linux:s390utils-cmsfs-fuse, p-cpe:/a:redhat:enterprise_linux:s390utils-core, p-cpe:/a:redhat:enterprise_linux:s390utils-cpacfstatsd, p-cpe:/a:redhat:enterprise_linux:s390utils-cpuplugd, p-cpe:/a:redhat:enterprise_linux:s390utils-devel, p-cpe:/a:redhat:enterprise_linux:s390utils-hmcdrvfs, p-cpe:/a:redhat:enterprise_linux:s390utils-iucvterm, p-cpe:/a:redhat:enterprise_linux:s390utils-mon_statd, p-cpe:/a:redhat:enterprise_linux:s390utils-osasnmpd, p-cpe:/a:redhat:enterprise_linux:s390utils-se-data, p-cpe:/a:redhat:enterprise_linux:s390utils-zdsfs, p-cpe:/a:redhat:enterprise_linux:s390utils-ziomon, p-cpe:/a:redhat:enterprise_linux:s390utils, p-cpe:/a:redhat:enterprise_linux:sevctl, p-cpe:/a:redhat:enterprise_linux:shim-aa64, p-cpe:/a:redhat:enterprise_linux:shim-ia32, p-cpe:/a:redhat:enterprise_linux:shim-signed, p-cpe:/a:redhat:enterprise_linux:shim-x64, p-cpe:/a:redhat:enterprise_linux:shim, p-cpe:/a:redhat:enterprise_linux:system-reinstall-bootc
Required KB Items: Host/local_checks_enabled, Host/cpu, global_settings/vendor_unpatched, Host/OS/identifier
Exploit Ease: No known exploits are available
Vulnerability Publication Date: 9/29/2026
Reference Information
CVE: CVE-2026-84782