Vulnerability Intelligence Report
Glibc: buffer overflow in ld.so leading to privilege escalation
CVE-2023-4911
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.
CISA KEV
Nuclei Template
SSVC: Active Exploitation
CVSS Base Score
7.8
HIGH
Exploitability:1.9
Impact Score:5.9
EPSS Probability:81.42%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-122 ↗Heap-based Buffer Overflow
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| 2.34 < 2.39 (affected) | ||
| Red Hat | Red Hat Enterprise Linux 8 | 0:2.28-225.el8_8.6 < * (unaffected) |
| Red Hat | Red Hat Enterprise Linux 8 | 0:2.28-225.el8_8.6 < * (unaffected) |
| Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support | 0:2.28-189.6.el8_6 < * (unaffected) |
| Red Hat | Red Hat Enterprise Linux 9 | 0:2.34-60.el9_2.7 < * (unaffected) |
| Red Hat | Red Hat Enterprise Linux 9 | 0:2.34-60.el9_2.7 < * (unaffected) |
| Red Hat | Red Hat Enterprise Linux 9.0 Extended Update Support | 0:2.34-28.el9_0.4 < * (unaffected) |
| Red Hat | Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 | 0:2.28-189.6.el8_6 < * (unaffected) |
| Red Hat | Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 | 0:4.5.3-10.el8ev < * (unaffected) |
| Red Hat | Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 | 0:4.5.3-202312060823_8.6 < * (unaffected) |
| Red Hat | Red Hat Enterprise Linux 6 | all |
| Red Hat | Red Hat Enterprise Linux 7 | all |
| Red Hat | Red Hat Enterprise Linux 7 | all |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
CISA KEV
ACTIVE IN CATALOG
Nuclei Template
SCANNER AVAILABLE
EPSS Score
81.422%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Red Hat, Inc. · Vendor · USA |
| Reserved | 2023-09-12T13:10:32 |
| Published | 2023-10-03T17:25:08 |
| Patch Date | 2023-10-03 |
| Last Updated | 2026-07-14T11:59:00 |
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