`CVE-2023-4911`

7.8 High Mitigation candidate

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.

CWE-122CWE-787 · Out-of-bounds write

Exploitation Status

Exploited in the wild

Confirmed real-world exploitation.

CVSS E:A

CISA KEV listed Confirmed exploitation in the wild. Added 2023-11-21 · remediation due 2023-12-12 · ransomware use: unknown
CISA Vulnrichment exploitation: active CISA records active exploitation. Automatable: no, technical impact: total.
Indexed PoC 20 indexed Published artifacts you can open, in Exploit-DB, GitHub PoC, Nuclei; first seen 2023-10-04.
EPSS 81% chance in 30 days A model prediction, not an observation. Higher than 100% of all scored CVEs.

Index	Artifact	Stars	First seen
GitHub PoC	PoC for CVE-2023-4911	394	2023-10-04
Nuclei	Looney Tunables Linux - Local Privilege Escalation
Exploit-DB	glibc 2.38 - Buffer Overflow		2026-02-11
GitHub PoC	CVE-2023-4911 proof of concept	167	2023-10-04
GitHub PoC	Exploit tool for CVE-2023-4911, targeting the 'Looney Tunables' glibc vulnerability in various Linux distributions.	43	2023-10-17
GitHub PoC	hadrian3689/looney-tunables-CVE-2023-4911	29	2023-10-10
GitHub PoC	CVE-2023-4911	19	2023-10-11
GitHub PoC	Looney Tunables Local privilege escalation (CVE-2023-4911) workshop	18	2023-10-25
GitHub PoC	https://www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txt	15	2023-10-04
GitHub PoC	Repository containing a Proof of Concept (PoC) demonstrating the impact of CVE-2023-4911, a vulnerability in glibc's ld.so dynamic loader, exposing risks related to Looney Tunables.	8	2024-01-20

Waratek Defense Posture

Mitigation candidate

A defect of the type ARMR addresses, with a fix path to work from and a working exploit already published. This is a claim on attention, not a scheduling commitment: no rule exists and none is scheduled.

Protection none
Action unverified patch rule
Review automated inferred
Record active

Decided by patch-hint : A reference pointing at the upstream fix: a commit, a PR, a Red Hat bug

Finding Red Hat published an advisory () confirming a fix exists, and the linked Bugzilla ticket (https://bugzilla.redhat.com/show_bug.cgi?id=2238352) points to the upstream OpenJDK source patch. That makes this CVE a candidate for an ARMR patch rule. No rule exists and none is scheduled: whether one can be derived depends on reading the actual change.

Candidate fix https://bugzilla.redhat.com/show_bug.cgi?id=2238352 : a Red Hat bug: the triage, which links onward to the fix

Decided by	`patch-hint` : A reference pointing at the upstream fix: a commit, a PR, a Red Hat bug
Finding	Red Hat published an advisory () confirming a fix exists, and the linked Bugzilla ticket (https://bugzilla.redhat.com/show_bug.cgi?id=2238352) points to the upstream OpenJDK source patch. That makes this CVE a candidate for an ARMR patch rule. No rule exists and none is scheduled: whether one can be derived depends on reading the actual change.
Candidate fix	https://bugzilla.redhat.com/show_bug.cgi?id=2238352 : a Red Hat bug: the triage, which links onward to the fix

CVSS

7.8 HIGH v3.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H 2 metrics

VRT selects the newest version's highest entry and publishes it as cvssScore, newest rather than largest because scores are not comparable across versions, and highest rather than first because the first entry is frequently a CNA placeholder scoring 0.0 over NVD's own analysis.

Version Score Band Vector Assigner Type

CVSS 3.1 7.8 HIGH CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H secalert@redhat.com Secondary published

CVSS 3.1 7.8 HIGH CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H NVD Primary

Version	Score	Band	Vector	Assigner	Type
CVSS 3.1	7.8	HIGH	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`	secalert@redhat.com	Secondary	published
CVSS 3.1	7.8	HIGH	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`	NVD	Primary

Affected Software & Releases

🏛️ Oracle CPU Advisories & Products

Advisory	Type	Quarter	Products Oracle named in risk matrix
Oracle Critical Patch Update January 2024 ↗	CPU	2024-Q1	Oracle Communications / Signaling (glibc) (23.3.0)

Advisory

Type

Quarter

Products Oracle named in risk matrix

Oracle Critical Patch Update January 2024 ↗

CPU

2024-Q1

Oracle Communications / Signaling (glibc) (23.3.0)

Indexed Oracle Components & Versions

Family	Component	Oracle's version cell (verbatim)	Indexed as
Oracle Communications	Signaling (glibc)	23.3.0	23.3.0

Family

Component

Oracle's version cell (verbatim)

Indexed as

Oracle Communications

Signaling (glibc)

23.3.0

🖥️ Product CPEs & Version Ranges

39 product(s) over 73 version claims (uncapped)

Source	Vendor	Product	Scheme	Affected Versions
nvd	canonical	ubuntu linux	generic	22.04 · 23.04
nvd	debian	debian linux	generic	11.0 · 12.0
nvd	fedoraproject	fedora	generic	37 · 38 · 39
nvd	gnu	glibc	generic	≥ 2.34 and ＜ 2.39
nvd	netapp	bootstrap os	generic	any version
nvd	netapp	h300s firmware	generic	any version
nvd	netapp	h410c firmware	generic	any version
nvd	netapp	h410s firmware	generic	any version
nvd	netapp	h500s firmware	generic	any version
nvd	netapp	h700s firmware	generic	any version
nvd	netapp	ontap select deploy administration utility	generic	any version
nvd	redhat	codeready linux builder	generic	9.0
nvd	redhat	codeready linux builder eus	generic	8.6 · 9.2 · 9.4 · 9.6
nvd	redhat	codeready linux builder for arm64	generic	9.0_aarch64
nvd	redhat	codeready linux builder for arm64 eus	generic	8.6 · 9.2_aarch64 · 9.4_aarch64 · 9.6_aarch64
nvd	redhat	codeready linux builder for ibm z systems	generic	9.0_s390x
nvd	redhat	codeready linux builder for ibm z systems eus	generic	8.6 · 9.2_s390x · 9.4_s390x · 9.6_s390x
nvd	redhat	codeready linux builder for power little endian	generic	9.0_ppc64le
nvd	redhat	codeready linux builder for power little endian eus	generic	8.6 · 9.2_ppc64le · 9.4_ppc64le · 9.6_ppc64le
nvd	redhat	enterprise linux	generic	8.0 · 9.0
nvd	redhat	enterprise linux eus	generic	8.6 · 9.2 · 9.4 · 9.6
nvd	redhat	enterprise linux for arm 64	generic	9.0_aarch64
nvd	redhat	enterprise linux for arm 64 eus	generic	8.6_aarch64 · 9.2_aarch64 · 9.4_aarch64 · 9.6_aarch64
nvd	redhat	enterprise linux for ibm z systems	generic	9.0_s390x
nvd	redhat	enterprise linux for ibm z systems eus	generic	9.2_s390x · 9.4_s390x · 9.6_s390x
nvd	redhat	enterprise linux for ibm z systems eus s390x	generic	8.6
nvd	redhat	enterprise linux for power big endian eus	generic	8.6_ppc64le
nvd	redhat	enterprise linux for power little endian	generic	9.0_ppc64le
nvd	redhat	enterprise linux for power little endian eus	generic	9.2_ppc64le · 9.4_ppc64le · 9.6_ppc64le
nvd	redhat	enterprise linux server aus	generic	8.6 · 9.2 · 9.4 · 9.6
nvd	redhat	enterprise linux server for power little endian update services for sap solutions	generic	9.2_ppc64le · 9.4_ppc64le · 9.6_ppc64le
nvd	redhat	enterprise linux server tus	generic	8.6
nvd	redhat	enterprise linux update services for sap solutions	generic	9.2 · 9.4 · 9.6
nvd	redhat	virtualization	generic	4.0
nvd	redhat	virtualization host	generic	4.0
nvd	siemens	simatic s7-1500 cpu 1518-4 pn\/dp mfp firmware	generic	≥ 3.1.5
nvd	siemens	simatic s7-1500 cpu 1518f-4 pn\/dp mfp firmware	generic	≥ 3.1.5
nvd	siemens	simatic s7-1500 tm mfp firmware	generic	＜ 1.1
nvd	siemens	siplus s7-1500 cpu 1518-4 pn\/dp mfp firmware	generic	≥ 3.1.5

Source

Vendor

Product

Scheme

Affected Versions

nvd

canonical

ubuntu linux

generic

22.04 · 23.04

nvd

debian

debian linux

generic

11.0 · 12.0

nvd

fedoraproject

fedora

generic

37 · 38 · 39

nvd

gnu

glibc

generic

≥ 2.34 and ＜ 2.39

nvd

netapp

bootstrap os

generic

any version

nvd

netapp

h300s firmware

generic

any version

nvd

netapp

h410c firmware

generic

any version

nvd

netapp

h410s firmware

generic

any version

nvd

netapp

h500s firmware

generic

any version

nvd

netapp

h700s firmware

generic

any version

nvd

netapp

ontap select deploy administration utility

generic

any version

nvd

redhat

codeready linux builder

generic

9.0

nvd

redhat

codeready linux builder eus

generic

8.6 · 9.2 · 9.4 · 9.6

nvd

redhat

codeready linux builder for arm64

generic

9.0_aarch64

nvd

redhat

codeready linux builder for arm64 eus

generic

8.6 · 9.2_aarch64 · 9.4_aarch64 · 9.6_aarch64

nvd

redhat

codeready linux builder for ibm z systems

generic

9.0_s390x

nvd

redhat

codeready linux builder for ibm z systems eus

generic

8.6 · 9.2_s390x · 9.4_s390x · 9.6_s390x

nvd

redhat

codeready linux builder for power little endian

generic

9.0_ppc64le

nvd

redhat

codeready linux builder for power little endian eus

generic

8.6 · 9.2_ppc64le · 9.4_ppc64le · 9.6_ppc64le

nvd

redhat

enterprise linux

generic

8.0 · 9.0

nvd

redhat

enterprise linux eus

generic

8.6 · 9.2 · 9.4 · 9.6

nvd

redhat

enterprise linux for arm 64

generic

9.0_aarch64

nvd

redhat

enterprise linux for arm 64 eus

generic

8.6_aarch64 · 9.2_aarch64 · 9.4_aarch64 · 9.6_aarch64

nvd

redhat

enterprise linux for ibm z systems

generic

9.0_s390x

nvd

redhat

enterprise linux for ibm z systems eus

generic

9.2_s390x · 9.4_s390x · 9.6_s390x

nvd

redhat

enterprise linux for ibm z systems eus s390x

generic

8.6

nvd

redhat

enterprise linux for power big endian eus

generic

8.6_ppc64le

nvd

redhat

enterprise linux for power little endian

generic

9.0_ppc64le

nvd

redhat

enterprise linux for power little endian eus

generic

9.2_ppc64le · 9.4_ppc64le · 9.6_ppc64le

nvd

redhat

enterprise linux server aus

generic

8.6 · 9.2 · 9.4 · 9.6

nvd

redhat

enterprise linux server for power little endian update services for sap solutions

generic

9.2_ppc64le · 9.4_ppc64le · 9.6_ppc64le

nvd

redhat

enterprise linux server tus

generic

8.6

nvd

redhat

enterprise linux update services for sap solutions

generic

9.2 · 9.4 · 9.6

nvd

redhat

virtualization

generic

4.0

nvd

redhat

virtualization host

generic

4.0

nvd

siemens

simatic s7-1500 cpu 1518-4 pn\/dp mfp firmware

generic

≥ 3.1.5

nvd

siemens

simatic s7-1500 cpu 1518f-4 pn\/dp mfp firmware

generic

≥ 3.1.5

nvd

siemens

simatic s7-1500 tm mfp firmware

generic

＜ 1.1

nvd

siemens

siplus s7-1500 cpu 1518-4 pn\/dp mfp firmware

generic

≥ 3.1.5

References

URL	Tags
https://bugzilla.redhat.com/show_bug.cgi?id=2238352	bugzilla
https://sourceware.org/git/?p=glibc.git
https://access.redhat.com/security/cve/cve-2023-4911, https://www.debian.org/security/2023/dsa-5514
https://access.redhat.com/errata/RHSA-2023:5453	Third Party Advisory
https://access.redhat.com/errata/RHSA-2023:5454	Third Party Advisory
https://access.redhat.com/errata/RHSA-2023:5455	Third Party Advisory
https://access.redhat.com/errata/RHSA-2023:5476	Third Party Advisory
https://access.redhat.com/errata/RHSA-2024:0033	Third Party Advisory
https://access.redhat.com/security/cve/CVE-2023-4911	Third Party Advisory
https://www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txt	Exploit, Third Party Advisory

URL

Timeline

Published 2023-10-03 Last modified 2026-06-17

Published	2023-10-03	By the CVE Program.
NVD record modified	2026-06-17	NVD's own last-modified date for this record.

Published

2023-10-03

By the CVE Program.

NVD record modified

2026-06-17

NVD's own last-modified date for this record.

Pipeline policy audit (17 of 21 rules evaluated)

17 of 21 rules ran. The rest were never reached, because an earlier stage settled the CVE, a distinct claim from a rule that ran and found nothing.

# Rule Outcome Status Detail

identity: Does this identifier describe a vulnerability at all? first match wins

1 rejected no-match CVE Program withdrawal of this identifier

scope: Is the vulnerability ARMR's to address? first match wins

2 armr-patch-file no-match An ARMR patch file on disk for this CVE

3 armr-secure-rule-file no-match An ARMR security-rule template on disk for this CVE

4 manual-classification no-match A researcher's recorded decision for this specific CVE

5 manual classification no-match Manual classification of this CVE in the legacy dataset

6 non-java-upstream no-match A root cause in non-Java code: an OS kernel, a C library, or a bundled runtime

7 oracle-component no-match The defect being in a component of a tracked product the agent does not reach: JavaFX, the Java SE installer, the native WebLogic proxy plug-in. Oracle gives these no CPE of their own and names them only in the description.

8 osv-maven no-match An OSV.dev record of this CVE affecting a package published to Maven Central

9 cna-maven-package no-match An affected Maven artifact named by the CNA itself

10 known-cpe-product matched Queued for review Matches known products: redhat/virtualization, redhat/virtualization_host

11 cna-cpe-product not-reached A CPE the CNA published naming a tracked product. Oracle publishes these on advisory day, months before NVD.

12 oracle-advisory-family not-reached A tracked product family named in Oracle's own risk matrix. CPE cannot carry a suite name, only a module.

13 non-deployable-product not-reached The only affected product being a sealed appliance image, where Java runs but no -javaagent can be attached

14 unmatched-product not-reached No tracked product matched above, and none present at all

disposition: What do we do about one that is? cumulative: every rule gets a turn

15 patch-hint decided it matched Mitigation candidate References include candidate fix URL (bugzilla tier): https://bugzilla.redhat.com/show_bug.cgi?id=2238352

16 open-source-maven skipped The affected package being open source on Maven, so the fix can be read

17 poc-derivable skipped An indexed exploit to reverse-engineer, where there is no source to read

18 no-exploit skipped With no fix path, a public exploit, or a CISA record of one

19 secure-rule-match no-match A vulnerability class already blocked by an ARMR security rule

20 below-action-threshold no-match Severity is HIGH — only MEDIUM/LOW are deprioritized

21 no-exploit-published no-match A KEV listing, a CISA verdict of active exploitation, or a reviewed exploit catalogue carries this CVE — somebody has published a working exploit, so it stays a candidate

What the scope rules read

The products the record named, and whether known-products.yaml tracks them. This is the evidence the scope stage decided on.

Vendor Product Tracked CPE Source

netapp bootstrap_os not tracked cpe:2.3:o:netapp:bootstrap_os:-:*:*:*:*:*:*:*

siemens simatic_s7-1500_cpu_1518-4_pn\/dp_mfp_firmware not tracked cpe:2.3:o:siemens:simatic_s7-1500_cpu_1518-4_pn\/dp_mfp_firmware:*:*:*:*:*:*:*:*

siemens simatic_s7-1500_cpu_1518f-4_pn\/dp_mfp_firmware not tracked cpe:2.3:o:siemens:simatic_s7-1500_cpu_1518f-4_pn\/dp_mfp_firmware:*:*:*:*:*:*:*:*

siemens siplus_s7-1500_cpu_1518-4_pn\/dp_mfp_firmware not tracked cpe:2.3:o:siemens:siplus_s7-1500_cpu_1518-4_pn\/dp_mfp_firmware:*:*:*:*:*:*:*:*

siemens simatic_s7-1500_tm_mfp_firmware not tracked cpe:2.3:o:siemens:simatic_s7-1500_tm_mfp_firmware:*:*:*:*:*:*:*:*

gnu glibc not tracked cpe:2.3:a:gnu:glibc:*:*:*:*:*:*:*:*

fedoraproject fedora not tracked cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:*

redhat codeready_linux_builder not tracked cpe:2.3:a:redhat:codeready_linux_builder:9.0:*:*:*:*:*:*:*

redhat codeready_linux_builder_eus not tracked cpe:2.3:a:redhat:codeready_linux_builder_eus:8.6:*:*:*:*:*:*:*

redhat codeready_linux_builder_for_arm64 not tracked cpe:2.3:a:redhat:codeready_linux_builder_for_arm64:9.0_aarch64:*:*:*:*:*:*:*

redhat codeready_linux_builder_for_arm64_eus not tracked cpe:2.3:a:redhat:codeready_linux_builder_for_arm64_eus:8.6:*:*:*:*:*:*:*

redhat codeready_linux_builder_for_ibm_z_systems not tracked cpe:2.3:a:redhat:codeready_linux_builder_for_ibm_z_systems:9.0_s390x:*:*:*:*:*:*:*

redhat codeready_linux_builder_for_ibm_z_systems_eus not tracked cpe:2.3:a:redhat:codeready_linux_builder_for_ibm_z_systems_eus:8.6:*:*:*:*:*:*:*

redhat codeready_linux_builder_for_power_little_endian not tracked cpe:2.3:a:redhat:codeready_linux_builder_for_power_little_endian:9.0_ppc64le:*:*:*:*:*:*:*

redhat codeready_linux_builder_for_power_little_endian_eus not tracked cpe:2.3:a:redhat:codeready_linux_builder_for_power_little_endian_eus:8.6:*:*:*:*:*:*:*

redhat virtualization tracked cpe:2.3:a:redhat:virtualization:4.0:*:*:*:*:*:*:* yaml

redhat virtualization_host tracked cpe:2.3:a:redhat:virtualization_host:4.0:*:*:*:*:*:*:* yaml

redhat enterprise_linux not tracked cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*

redhat enterprise_linux_eus not tracked cpe:2.3:o:redhat:enterprise_linux_eus:8.6:*:*:*:*:*:*:*

redhat enterprise_linux_for_arm_64 not tracked cpe:2.3:o:redhat:enterprise_linux_for_arm_64:9.0_aarch64:*:*:*:*:*:*:*

redhat enterprise_linux_for_arm_64_eus not tracked cpe:2.3:o:redhat:enterprise_linux_for_arm_64_eus:8.6_aarch64:*:*:*:*:*:*:*

redhat enterprise_linux_for_ibm_z_systems not tracked cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:9.0_s390x:*:*:*:*:*:*:*

redhat enterprise_linux_for_ibm_z_systems_eus not tracked cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems_eus:9.2_s390x:*:*:*:*:*:*:*

redhat enterprise_linux_for_ibm_z_systems_eus_s390x not tracked cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems_eus_s390x:8.6:*:*:*:*:*:*:*

redhat enterprise_linux_for_power_big_endian_eus not tracked cpe:2.3:o:redhat:enterprise_linux_for_power_big_endian_eus:8.6_ppc64le:*:*:*:*:*:*:*

redhat enterprise_linux_for_power_little_endian not tracked cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:9.0_ppc64le:*:*:*:*:*:*:*

redhat enterprise_linux_for_power_little_endian_eus not tracked cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian_eus:9.2_ppc64le:*:*:*:*:*:*:*

redhat enterprise_linux_server_aus not tracked cpe:2.3:o:redhat:enterprise_linux_server_aus:8.6:*:*:*:*:*:*:*

redhat enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions not tracked cpe:2.3:o:redhat:enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions:9.2_ppc64le:*:*:*:*:*:*:*

redhat enterprise_linux_server_tus not tracked cpe:2.3:o:redhat:enterprise_linux_server_tus:8.6:*:*:*:*:*:*:*

redhat enterprise_linux_update_services_for_sap_solutions not tracked cpe:2.3:o:redhat:enterprise_linux_update_services_for_sap_solutions:9.2:*:*:*:*:*:*:*

canonical ubuntu_linux not tracked cpe:2.3:o:canonical:ubuntu_linux:22.04:*:*:*:lts:*:*:*

debian debian_linux not tracked cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*

netapp h410c_firmware not tracked cpe:2.3:o:netapp:h410c_firmware:-:*:*:*:*:*:*:*

netapp h300s_firmware not tracked cpe:2.3:o:netapp:h300s_firmware:-:*:*:*:*:*:*:*

netapp h500s_firmware not tracked cpe:2.3:o:netapp:h500s_firmware:-:*:*:*:*:*:*:*

netapp h700s_firmware not tracked cpe:2.3:o:netapp:h700s_firmware:-:*:*:*:*:*:*:*

netapp h410s_firmware not tracked cpe:2.3:o:netapp:h410s_firmware:-:*:*:*:*:*:*:*

netapp ontap_select_deploy_administration_utility not tracked cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:*:*:*:*:*:*:*

Raw stored JSON document for this CVE ↗ · NVD ↗ · CVE.org ↗