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Fencer Vulns
medium 4.6

CVE-2016-2781 json

chroot in GNU coreutils, when used with --userspec, allows local users to escape to the parent session via a crafted TIOCSTI ioctl call, wh…

published 2017-02-07 9 y ago modified 2026-06-17 4 mo ago also EUVD-2016-3855

cvss
4.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 37%
public exploits
0
none known

Summary

chroot in GNU coreutils, when used with --userspec, allows local users to escape to the parent session via a crafted TIOCSTI ioctl call, which pushes characters to the terminal's input buffer.

Patch / fix

  • coreutils Debian 14, Debian 13 9.4-1

debian advisories DEBIAN-CVE-2016-2781

  • coreutils Azure Linux 3.0 9.4-1
  • coreutils CBL-Mariner 2.0 8.32-1

azure linux advisories AZL-34628AZL-6355

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2016-2781 updated cvss 8.6

coreutils: Non-privileged session can escape to the parent session in chroot

  • Red Hat Enterprise Linux 6 coreutils, coreutils-libs Red Hat Enterprise Linux 7 coreutils
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux 5 coreutils
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
17 mo ago

Exploit prediction

0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 4.6 CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
CNA 3.1 4.6 CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
NVD 3.0 6.5 CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:N/I:P/A:N

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.