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Echo: glibc: security update to 2.41-12+deb13u4+e3

medium Tenable Self-Hosted Container Security Plugin ID 463609

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - A time-of-check to time-of-use (TOCTOU) race condition in the dynamic loader (ld.so) of the GNU C Library
 (glibc) versions 2.14 through 2.44 allows a local attacker to escalate privileges. When expanding $ORIGIN
 in DT_RPATH for setuid/setgid (AT_SECURE) programs, glibc validates the lexically normalized search path
 against the trusted directories but then opens the raw, un-normalized path. On systems where the Linux
 fs.protected_hardlinks sysctl is disabled, a local attacker who hard-links such a program into an
 attacker-controlled directory and wins a race to replace an intermediate path component with a symbolic
 link can direct the loader outside the trusted directory, causing it to load an attacker-controlled shared
 object and execute arbitrary code with the elevated privileges of the program. Exploitation requires an
 installed setuid or setgid binary whose DT_RPATH uses $ORIGIN followed by ".." traversal that normalizes
 into a trusted directory, and the ability to hard-link that binary and win the race by swapping a path
 component for a symbolic link. Major Linux-based OS distributions ship with fs.protected_hardlinks enabled
 by default and mitigate the vulnerability. (CVE-2026-86805)

Solution

Update the glibc library and its related packages to version 2.41-12+deb13u4+e3 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-86805

Plugin Details

Severity: Medium

ID: 463609

Version: Revision 1.2

Type: Local

Published: 10/2/2026

Updated: 10/5/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.5

Percentile: 57.74

CVSS v2

Risk Factor: Medium

Base Score: 5.7

Temporal Score: 4.2

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

CVSS Score Source: CVE-2026-86805

CVSS v3

Risk Factor: Medium

Base Score: 6.3

Temporal Score: 5.5

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

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

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 9/23/2026

Vulnerability Publication Date: 9/22/2026

Reference Information

CVE: CVE-2026-86805