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CVE-2023-4911

Glibc: buffer overflow in ld.so leading to privilege escalation

CVSS 3.1 High 7.8Known exploited (CISA KEV)

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Description

A buffer overflow was discovered in the GNU C Library's dynamic loader ld.so while processing the GLIBC_TUNABLES environment variable. This issue could allow a local attacker to use maliciously crafted GLIBC_TUNABLES environment variables when launching binaries with SUID permission to execute code with elevated privileges.

Official description from the CVE record, published by redhat. Copyright © 1999-2026 The MITRE Corporation. See /security/cve/legal for the CVE license. View the record on cve.org

Key data

CVSS 3.1 High 7.8

Score published by redhat in the CVE record.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

  • Attack vector: Local

    The attacker needs local access to the system, or to trick a user into running something.

  • Attack complexity: Low

    No special conditions are needed. The attack can be repeated at will.

  • Privileges required: Low

    A basic user account is needed.

  • User interaction: None

    No action from any user is needed.

  • Scope: Unchanged

    The impact stays within the vulnerable component.

  • Confidentiality impact: High

    Serious or total effect on the secrecy of data.

  • Integrity impact: High

    Serious or total effect on the trustworthiness of data.

  • Availability impact: High

    Serious or total effect on availability.

CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at first.org/cvss.

EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.
Score
0.63769 (63.8% probability)
Percentile
99.2%
Scores of
Nov 10, 2026
Model
v2026.06.15

CISA Known Exploited Vulnerabilities

This CVE is listed in the CISA KEV catalog.
Name in the catalog
GNU C Library Buffer Overflow Vulnerability
Added to the catalog
Nov 21, 2023
Federal due date
Dec 12, 2023

CISA assessment as of Oct 15, 2025

Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA.
Exploitation
Recorded by CISA as active
Automatable
no
Technical impact
total

Weakness (CWE)

CWE catalog version 5.0.
CWE names: Copyright © 2006-2026, The MITRE Corporation. See /security/cve/legal for the CWE license.

Affected products

Products listed in the CVE record, as the CNA published them.

  • glibc

    • affected: 2.34 up to before 2.39

  • Red Hat Enterprise Linux 8

    • unaffected: 0:2.28-225.el8_8.6 up to before *

  • Red Hat Enterprise Linux 8

    • unaffected: 0:2.28-225.el8_8.6 up to before *

  • Red Hat Enterprise Linux 8.6 Extended Update Support

    • unaffected: 0:2.28-189.6.el8_6 up to before *

  • Red Hat Enterprise Linux 9

    • unaffected: 0:2.34-60.el9_2.7 up to before *

  • Red Hat Enterprise Linux 9

    • unaffected: 0:2.34-60.el9_2.7 up to before *

  • Red Hat Enterprise Linux 9.0 Extended Update Support

    • unaffected: 0:2.34-28.el9_0.4 up to before *

  • Red Hat Virtualization 4 for Red Hat Enterprise Linux 8

    • unaffected: 0:2.28-189.6.el8_6 up to before *

  • Red Hat Virtualization 4 for Red Hat Enterprise Linux 8

    • unaffected: 0:4.5.3-10.el8ev up to before *

  • Red Hat Virtualization 4 for Red Hat Enterprise Linux 8

    • unaffected: 0:4.5.3-202312060823_8.6 up to before *

Listed as not affected

  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 7

References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

Timeline

  1. ID reserved
  2. Record published
  3. Added to CISA KEV
  4. Record last updated

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Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:24 UTC. Sources and licenses