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Glibc: buffer overflow in ld.so leading to privilege escalation
CVE-2023-49114 of 4 sources documented this
rank 79 = 40 + 20 + 3 + 10 + 6
rank@v1 · act now
Someone is already using it
CISA KEV catalog · public proof-of-concept · FIRST EPSS
EPSS 0.81422 · CISA KEV listed · without this subject the record ranks 39
What it costs you if it fires
NVD CVSS base score, then the CNA's own
CVSS 7.8, from NVD · without this subject the record ranks 59
It is getting worse, not staying still
FIRST EPSS series, rescorings and bad loads removed
rose on 2026-04-07 · without this subject the record ranks 76
How much of the world it touches
NVD CPE configurations
20 products in the CPE ranges · without this subject the record ranks 69
Someone else already set the date
CISA KEV remediation due date
CISA remediation date held · without this subject the record ranks 73
Unaudited dollar value2 of 3 inputs carry a receipt
Exposure$4.06Mover the next 30 days, if this record is yours
Movement-$141,000on 2025-03-30, the last material move, 1 year, 5 months before this reading
Basisassumeda published average, not your estate
$4.06M = $4.99M incident cost x 1 exposure x 0.81422 likelihood
udv@v1 · unaudited · wrong for you until you say what you run
$4.99M is the cost of a breach that happened, from IBM Cost of a Data Breach Report 2026, global average. It is not the value of any asset of yours. That average already covers breaches of every severity, so scaling it by exposure understates a partial-impact record. That is an assumption, not a measurement. Your own asset value goes in the decision record.
PLATEAUMinimal movement since 2026-06-15, 81 days at 0.81, as of 2026-09-04. arc-rules@v1
Foresight · where to check next
This record is one instance of CWE-122, heap-based buffer overflow. The index holds 3215 prior instances of this class, 19 KEV-listed. The nearest of its KEV-listed records are drawn beside this. taxonomy@v1
Prior records in this weakness class. Each is its own record, dated and receipted.
Color is a claim, not decoration:the hostile worldthe defenseno signalspoke length is how much of the record matches, not how bad it is
Running Red Hat Enterprise Linux 8? Check your version
A deterministic range check against the ranges this record publishes. It tells you where a version sits in the record, not whether your deployment is exploitable. No account needed.
Watch this record
Matches your own product list against every record this index holds, and tells you when one of them moves.
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Harm, if it fires from the vector and the weakness
Written for the ticket you're about to file.
Reachneeds local access · low privileges required · no user interaction · low attack complexityreceipt
ImpactComplete confidentiality, integrity and availability lossreceipt
Patch available sinceNo dated patch-availability record in held sources. The index holds reference URLs without dates and only the current revision of the CVE record, so the day a fix first existed cannot be derived. Only the versions it landed in.
CISA remediation statusoverdue since 2023-12-12receipt
CISA required actionApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.receipt
Published to CISA KEV49 daysderived
Exploit Status & Known PoCs a ladder, not a score
Current rung: Exploited in the wild · CISA KEV listed, 2023-11-21.
RUNG 1Nothing observed in held sources
RUNG 2Proof-of-concept published · 21 public repositories2023-10-04receipt
RUNG 3Exploited in the wild · CISA KEV listed2023-11-21receipt
Affected productRed 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…receipt
Published rangesredhat codeready linux builder 9.0; redhat codeready linux builder eus 8.6; redhat codeready linux builder eus 9.2; redhat codeready linux builder eus 9.4receipt
Show all 20 published ranges
redhat codeready linux builder 9.0
redhat codeready linux builder eus 8.6
redhat codeready linux builder eus 9.2
redhat codeready linux builder eus 9.4
redhat codeready linux builder eus 9.6
redhat codeready linux builder for arm64 9.0_aarch64
redhat codeready linux builder for arm64 eus 8.6
redhat codeready linux builder for arm64 eus 9.2_aarch64
redhat codeready linux builder for arm64 eus 9.4_aarch64
redhat codeready linux builder for arm64 eus 9.6_aarch64
redhat codeready linux builder for ibm z systems 9.0_s390x
redhat codeready linux builder for ibm z systems eus 8.6
siemens simatic s7-1500 cpu 1518-4 pn\/dp mfp firmware >= 3.1.5
siemens simatic s7-1500 cpu 1518f-4 pn\/dp mfp firmware >= 3.1.5
siemens siplus s7-1500 cpu 1518-4 pn\/dp mfp firmware >= 3.1.5
A rung lights from a row in the index, never from an assessment. "Held sources" is the true scope of the claim: this index reads the CVE record, NVD, CISA KEV, FIRST's EPSS and public proof-of-concept repositories, and it does not observe attacks.
Attack path
What it is stated by the CNA
Looney Tunables is the common name for 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. cve-aliases@2026-08-27
NVD's analysis a second authority
severity
7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
weakness
CWE-122; CWE-787
affected versions
redhat codeready linux builder 9.0; redhat codeready linux builder eus 8.6; redhat codeready linux builder eus 9.2; and 17 more, listed in full below
17 Mar 20250.88942 · crossed 0.50 · scoring model v2025.03.14
19 Mar 20250.90524 · crossed 0.90
20 Mar 20250.88942 · crossed 0.90
21 Mar 20250.90524 · crossed 0.90
22 Mar 20250.88942 · crossed 0.90
23 Mar 20250.91221 · crossed 0.90
25 Mar 20250.88942 · crossed 0.90
26 Mar 20250.90524 · crossed 0.90
28 Mar 20250.88942 · crossed 0.90
29 Mar 20250.91758 · crossed 0.90
30 Mar 20250.88942 · crossed 0.90
15 Apr 20250.741
30 Apr 20250.59559
4 May 20250.713
3 Jul 20250.57496
8 Jul 20250.70815
6 Aug 20250.81669
13 Nov 20250.69791
18 Nov 20250.88828
21 Nov 20250.69791
26 Feb 20260.5716
7 Apr 20260.72535
26 Apr 20260.62331
4 May 20260.74256
22 May 20260.62998
15 Jun 20260.78607 · scoring model v2026.06.15
28 Jun 20260.81422
Show all 137 observations
4 Oct 20230.00085
5 Oct 20230.00121
6 Oct 20230.00044
8 Nov 20230.00181
22 Nov 20230.01807
21 Dec 20230.01715
12 Feb 20240.01710
15 Mar 20240.01877
17 Apr 20240.01574
21 May 20240.01388
6 Jul 20240.01586
29 Jul 20240.01669
2 Sep 20240.01741
17 Sep 20240.03779
18 Sep 20240.02752
9 Oct 20240.03086
4 Nov 20240.03289
16 Nov 20240.17227
29 Nov 20240.17546
12 Dec 20240.16927
7 Jan 20250.20633
20 Jan 20250.22974
28 Jan 20250.25148
3 Feb 20250.27156
16 Feb 20250.24763
2 Mar 20250.22850
17 Mar 20250.88942
19 Mar 20250.90524
20 Mar 20250.88942
21 Mar 20250.90524
22 Mar 20250.88942
23 Mar 20250.91221
25 Mar 20250.88942
26 Mar 20250.90524
27 Mar 20250.91221
28 Mar 20250.88942
29 Mar 20250.91758
30 Mar 20250.88942
31 Mar 20250.89361
15 Apr 20250.741
24 Apr 20250.69909
25 Apr 20250.66475
26 Apr 20250.64597
30 Apr 20250.59559
1 May 20250.62569
4 May 20250.713
6 May 20250.75986
7 May 20250.8105
11 May 20250.77855
15 May 20250.713
19 May 20250.75986
21 May 20250.78597
23 May 20250.78819
6 Jun 20250.77439
9 Jun 20250.74667
10 Jun 20250.71265
15 Jun 20250.70944
17 Jun 20250.75468
19 Jun 20250.75032
20 Jun 20250.67816
21 Jun 20250.73054
22 Jun 20250.69977
24 Jun 20250.70561
25 Jun 20250.63211
26 Jun 20250.66736
3 Jul 20250.57496
5 Jul 20250.63218
8 Jul 20250.70815
16 Jul 20250.73151
17 Jul 20250.74608
28 Jul 20250.78156
2 Aug 20250.80512
3 Aug 20250.75365
6 Aug 20250.81669
8 Aug 20250.79513
11 Aug 20250.78229
13 Aug 20250.80735
16 Aug 20250.79513
25 Aug 20250.77176
28 Aug 20250.79637
5 Sep 20250.74116
9 Sep 20250.71996
11 Sep 20250.73736
12 Sep 20250.76845
19 Sep 20250.73736
24 Sep 20250.76845
1 Oct 20250.78361
27 Oct 20250.76845
28 Oct 20250.78361
3 Nov 20250.78409
10 Nov 20250.74187
13 Nov 20250.69791
18 Nov 20250.88828
21 Nov 20250.69791
18 Dec 20250.67806
27 Dec 20250.65552
28 Dec 20250.67806
1 Jan 20260.69791
15 Jan 20260.73037
12 Feb 20260.63615
18 Feb 20260.68766
19 Feb 20260.67117
20 Feb 20260.65335
21 Feb 20260.64599
23 Feb 20260.64664
26 Feb 20260.5716
4 Mar 20260.56515
5 Mar 20260.59531
21 Mar 20260.58107
23 Mar 20260.57696
24 Mar 20260.52633
29 Mar 20260.55755
1 Apr 20260.56176
2 Apr 20260.59128
5 Apr 20260.55588
7 Apr 20260.72535
8 Apr 20260.72771
9 Apr 20260.74256
21 Apr 20260.67392
26 Apr 20260.62331
27 Apr 20260.67477
2 May 20260.71068
4 May 20260.74256
6 May 20260.67192
9 May 20260.71534
22 May 20260.62998
24 May 20260.63939
27 May 20260.58726
30 May 20260.64338
3 Jun 20260.69916
5 Jun 20260.6505
6 Jun 20260.71554
7 Jun 20260.60911
8 Jun 20260.62198
9 Jun 20260.6505
15 Jun 20260.78607
28 Jun 20260.81422
137 observations held. A highlighted step crossed a promotion threshold. A step marked with a scoring model moved because the instrument was replaced, not because the vulnerability changed. receipt
The full biography
Listed by CISA 49 days after it published and the record had been public for 2 years, 11 months when this index was last written.
No material movement in 68 days as of the last ingest this index recorded.
Published 2023-10-03 receipt · Public PoC 2023-10-04 receipt · CISA KEV 2023-11-21 receipt · Index as of 2026-09-04 derived
The pattern, elsewhere
This record is one instance of CWE-122, heap-based buffer overflow. The index holds 3215 prior instances of this class, 19 KEV-listed. The nearest of its KEV-listed records are drawn beside this. [email protected]
CVE-2024-30051 · Microsoft Windows 10 Version 1809matches 9 of 10KEV listed · 2024receipt
CVE-2023-23376 · Microsoft Windows 10 Version 1507matches 9 of 10KEV listed · 2023receipt
CVE-2023-28252 · Microsoft Windows 10 Version 1809matches 9 of 10KEV listed · 2023receipt
CVE-2026-53362 · Linuxmatches 9 of 10KEV listed · 2026receipt
CVE-2023-36036 · Microsoft Windows 10 Version 1809matches 9 of 10KEV listed · 2023receipt
CVE-2026-85880 · Microsoft Windows 10 Version 1607matches 8 of 10KEV listed · 2026receipt
"Matches n of m" counts the attributes the two records can both be compared on: the CVSS metrics they share a version of, any weakness class beyond this one, and the vendor. fit-rules@v1
3215 records in this class held. The six above are drawn from the ones CISA has listed as exploited, ranked by how much of the record matches this one. That is why every one of them is KEV-listed: the pool is, so the colour on those spokes says nothing the pool has not already said.
No curated product neighbourhood is held for this product, so the records above are the nearest this index can name. The neighbourhood table covers a small set of products and is extended by hand.
Siblings and hubs
Records related to this one
No record cites this identifier and it carries no alias. Its defect family is below.
Its defect family
red hat enterprise linux 8
Of the 4 records in this family, this is the only one holding a stated fix version: 2.39.
This record is one of a group, and the group's page describes all of them. This page is kept and dated, and the defect family's own page is the one we offer for indexing: the whole group.