Detections
Analytics

Linux Distros Unpatched Vulnerability : CVE-2026-19542

medium Nessus Plugin ID 339040

Language:

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.

 - Calling tdelete on a sufficiently deep tree in the GNU C Library version 2.1 to 2.44 may write one pointer past the end of an alloca-allocated array on the stack, which may crash the application. The tdelete implementation keeps an explicit stack of parent nodes for rebalancing, which is grown as needed while descending the tree. Two rebalancing branches push an additional entry without checking the capacity, and write past the array when the stack is exactly full. Triggering this requires a node at a depth of exactly 40 (or 40 plus a multiple of 20), which implies a tree with at least a million nodes, so an attacker must drive a large number of insertions and deletions through an application that uses tsearch and tdelete. The written value is a pointer into a tree node and is not directly attacker controlled. No affected application in common distributions has been identified. (CVE-2026-19542)

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-2026-19542

https://security-tracker.debian.org/tracker/CVE-2026-19542

https://ubuntu.com/security/CVE-2026-19542

Plugin Details

Severity: Medium

ID: 339040

File Name: unpatched_CVE_2026_19542.nasl

Version: 1.10

Type: Local

Agent: unix

Family: Misc.

Published: 8/23/2026

Updated: 9/16/2026

Supported Sensors: Agentless Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 2.8

Percentile: 22.19

CVSS v2

Risk Factor: Medium

Base Score: 5.1

Temporal Score: 4.3

Vector: CVSS2#AV:N/AC:H/Au:N/C:P/I:P/A:P

CVSS Score Source: CVE-2026-19542

CVSS v3

Risk Factor: Medium

Base Score: 5.6

Temporal Score: 5.1

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

Temporal Vector: CVSS:3.0/E:U/RL:U/RC:C

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:14.04:-:lts, 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:debian:debian_linux:12.0, cpe:/o:debian:debian_linux:13.0, cpe:/o:redhat:enterprise_linux:10, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:canonical:ubuntu_linux:eglibc, p-cpe:/a:canonical:ubuntu_linux:glibc, p-cpe:/a:debian:debian_linux:glibc, p-cpe:/a:redhat:enterprise_linux:glibc-all-langpacks, p-cpe:/a:redhat:enterprise_linux:glibc-benchtests, p-cpe:/a:redhat:enterprise_linux:glibc-common, p-cpe:/a:redhat:enterprise_linux:glibc-devel, p-cpe:/a:redhat:enterprise_linux:glibc-doc, p-cpe:/a:redhat:enterprise_linux:glibc-gconv-extra, p-cpe:/a:redhat:enterprise_linux:glibc-headers, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-aa, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-af, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-agr, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-ak, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-am, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-an, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-anp, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-ar, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-as, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-ast, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-ayc, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-az, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-be, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-bem, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-ber, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-bg, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-bhb, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-bho, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-bi, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-bn, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-bo, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-br, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-brx, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-bs, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-byn, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-ca, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-ce, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-chr, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-ckb, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-cmn, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-crh, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-cs, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-csb, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-cv, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-cy, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-da, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-de, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-doi, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-dsb, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-dv, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-dz, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-el, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-en, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-eo, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-es, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-et, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-eu, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-fa, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-ff, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-fi, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-fil, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-fo, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-fr, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-fur, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-fy, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-ga, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-gbm, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-gd, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-gez, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-gl, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-gu, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-gv, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-ha, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-hak, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-he, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-hi, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-hif, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-hne, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-hr, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-hsb, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-ht, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-hu, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-hy, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-ia, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-id, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-ig, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-ik, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-is, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-it, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-iu, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-ja, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-ka, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-kab, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-kk, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-kl, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-km, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-kn, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-ko, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-kok, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-ks, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-ku, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-kv, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-kw, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-ky, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-lb, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-lg, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-li, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-lij, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-ln, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-lo, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-lt, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-lv, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-lzh, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-mag, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-mai, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-mfe, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-mg, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-mhr, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-mi, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-miq, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-mjw, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-mk, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-ml, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-mn, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-mni, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-mnw, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-mr, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-ms, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-mt, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-my, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-nan, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-nb, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-nds, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-ne, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-nhn, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-niu, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-nl, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-nn, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-nr, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-nso, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-oc, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-om, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-or, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-os, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-pa, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-pap, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-pl, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-ps, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-pt, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-quz, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-raj, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-rif, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-ro, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-ru, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-rw, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-sa, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-sah, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-sat, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-sc, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-sd, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-se, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-sgs, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-shn, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-shs, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-si, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-sid, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-sk, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-sl, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-sm, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-so, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-sq, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-sr, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-ss, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-ssy, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-st, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-su, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-sv, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-sw, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-syr, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-szl, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-ta, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-tcy, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-te, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-tg, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-th, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-the, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-ti, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-tig, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-tk, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-tl, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-tn, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-to, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-tok, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-tpi, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-tr, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-ts, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-tt, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-ug, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-uk, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-unm, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-ur, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-uz, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-ve, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-vi, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-wa, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-wae, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-wal, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-wo, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-xh, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-yi, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-yo, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-yue, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-yuw, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-zgh, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-zh, p-cpe:/a:redhat:enterprise_linux:glibc-langpack-zu, p-cpe:/a:redhat:enterprise_linux:glibc-locale-source, p-cpe:/a:redhat:enterprise_linux:glibc-minimal-langpack, p-cpe:/a:redhat:enterprise_linux:glibc-nss-devel, p-cpe:/a:redhat:enterprise_linux:glibc-static, p-cpe:/a:redhat:enterprise_linux:glibc-utils, p-cpe:/a:redhat:enterprise_linux:glibc, p-cpe:/a:redhat:enterprise_linux:libnsl, p-cpe:/a:redhat:enterprise_linux:nscd, p-cpe:/a:redhat:enterprise_linux:nss_db, p-cpe:/a:redhat:enterprise_linux:nss_hesiod

Required KB Items: Host/cpu, Host/local_checks_enabled, global_settings/vendor_unpatched, Host/OS/identifier

Exploit Ease: No known exploits are available

Reference Information

CVE: CVE-2026-19542