CVE record · CVE-2023-4911

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

CVSS 7.8 HighCriticalIn CISA KEVEPSS 0.64 · 99th percentile

Critical, because:

In CISA’s KEV catalogue since 21 Nov 2023: it is known to be exploited.
CVSS score 7.8 (7.0 or more) and EPSS 0.64 (0.1 or more): a high score and a real chance of exploitation in the next 30 days.

Published by the CVE Program (CNA: redhat) at 3 Oct 2023, 17:25 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Not given	Not given Package name: glibc https://sourceware.org/git/glibc.git	affected 2.34 to before 2.39 custom Other versions: unaffected
Red Hat	Red Hat Enterprise Linux 8 Package name: glibc https://access.redhat.com/downloads/content/package-browser/	unaffected 0:2.28-225.el8_8.6 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8 Package name: glibc https://access.redhat.com/downloads/content/package-browser/	unaffected 0:2.28-225.el8_8.6 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8.6 Extended Update Support Package name: glibc https://access.redhat.com/downloads/content/package-browser/	unaffected 0:2.28-189.6.el8_6 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 9 Package name: glibc https://access.redhat.com/downloads/content/package-browser/	unaffected 0:2.34-60.el9_2.7 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 9 Package name: glibc https://access.redhat.com/downloads/content/package-browser/	unaffected 0:2.34-60.el9_2.7 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 9.0 Extended Update Support Package name: glibc https://access.redhat.com/downloads/content/package-browser/	unaffected 0:2.34-28.el9_0.4 to before * rpm Other versions: affected
Red Hat	Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 Package name: glibc https://access.redhat.com/downloads/content/package-browser/	unaffected 0:2.28-189.6.el8_6 to before * rpm Other versions: affected
Red Hat	Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 Package name: redhat-release-virtualization-host https://access.redhat.com/downloads/content/package-browser/	unaffected 0:4.5.3-10.el8ev to before * rpm Other versions: affected
Red Hat	Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 Package name: redhat-virtualization-host https://access.redhat.com/downloads/content/package-browser/	unaffected 0:4.5.3-202312060823_8.6 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 6 Package name: glibc https://access.redhat.com/downloads/content/package-browser/	No versions given Other versions: unaffected
Red Hat	Red Hat Enterprise Linux 7 Package name: compat-glibc https://access.redhat.com/downloads/content/package-browser/	No versions given Other versions: unaffected
Red Hat	Red Hat Enterprise Linux 7 Package name: glibc https://access.redhat.com/downloads/content/package-browser/	No versions given Other versions: unaffected

Identifiers: CVE-2023-4911
CNA: redhat
Weakness (CWE): CWE-122
Tags: Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 8.6 Extended Update Support
Red Hat Enterprise Linux 9
Red Hat Enterprise Linux 9.0 Extended Update Support
Red Hat Virtualization 4 for Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Memory corruption
Published: 3 Oct 2023
Updated: 14 Oct 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
7.8	High	3.1	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	CNA (redhat)

CISA KEV Listed since 21 Nov 2023: known to be exploited.
EPSS 0.64, the 99th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 3 Oct 2023. New records show when each source confirmed them.

Sources

References from the CNA

access.redhat.com/errata/RHSA-2023:5453 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2023:5454 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2023:5455 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2023:5476 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2024:0033 vendor-advisoryredhat
access.redhat.com/security/cve/CVE-2023-4911 vdb-entryredhat
bugzilla.redhat.com/show_bug.cgi?id=2238352 issue-trackingredhat
www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txt
www.qualys.com/cve-2023-4911/

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.