TI-2023-03397 Aliases CVE-2023-3640 GHSA-g854-mv2r-2r5h

Observable discrepancy in Red Hat Enterprise Linux 6

LOW 37CWE-385Published 2023-07-24 · Updated 2026-07-21

Key facts

Attack vector: Local
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Information disclosure
Confidentiality · integrity · availability: High · High · High
Fix status: Partial Red Hat: 2 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-203.

Summary

A possible unauthorized memory access flaw was found in the Linux kernel's cpu_entry_area mapping of X86 CPU data to memory, where a user may guess the location of exception stacks or other important data. Based on the previous CVE-2023-0597, the 'Randomize per-cpu entry area' feature was implemented in /arch/x86/mm/cpu_entry_area.c, which works through the init_cea_offsets() function when KASLR is enabled. However, despite this feature, there is still a risk of per-cpu entry area leaks. This issue could allow a local user to gain access to some important data with memory in an expected location and potentially escalate their privileges on the system.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00761 55th percentileScored 2026-11-07

Fix Partial Red Hat: 1 advisoryRed Hat: 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Red Hat	Red Hat Enterprise Linux 6	—	—	Not affected	CNA
Red Hat	Red Hat Enterprise Linux 7	—	—	Not affected	CNA
Red Hat	Red Hat Enterprise Linux 7	—	—	Not affected	CNA
Red Hat	Red Hat Enterprise Linux 8	—	—	No fix listed	CNA
Red Hat	Red Hat Enterprise Linux 8	—	—	No fix listed	CNA
Red Hat	Red Hat Enterprise Linux 9	—	—	No fix listed	CNA
Red Hat	Red Hat Enterprise Linux 9	—	—	No fix listed	CNA

Red Hat Enterprise Linux 6 VendorRed Hat Affected — Fixed in — Not affected CNA
Red Hat Enterprise Linux 7 VendorRed Hat Affected — Fixed in — Not affected CNA
Red Hat Enterprise Linux 7 VendorRed Hat Affected — Fixed in — Not affected CNA
Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in — No fix listed CNA
Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in — No fix listed CNA
Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in — No fix listed CNA
Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in — No fix listed CNA

CPE configurations NVD · 3

CPE	Versions	Role	Vendor
cpe:2.3:o:linux:linux_kernel:-:::::::*	not specified by NVD	Vulnerable	Linux
cpe:2.3:o:redhat:enterprise_linux:8.0:::::::*	8.0	Vulnerable	Red Hat
cpe:2.3:o:redhat:enterprise_linux:9.0:::::::*	9.0	Vulnerable	Red Hat

cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Linux
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Red Hat
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Red Hat

Remediation

Red Hat 1 advisory

RHSA-2023:6583 Released 2023-11-07 · Red Hat rating Important
kernel security, bug fix, and enhancement update
- Red Hat CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-362.8.1.el9_3, libperf-5.14.0-362.8.1.el9_3
- Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-362.8.1.el9_3, kernel-64k-debug-devel-matched-5.14.0-362.8.1.el9_3, kernel-64k-devel-5.14.0-362.8.1.el9_3 +11
- Red Hat Enterprise Linux BaseOS (v. 9) bpftool-7.2.0-362.8.1.el9_3, kernel-5.14.0-362.8.1.el9_3, kernel-64k-5.14.0-362.8.1.el9_3 +29
- Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-362.8.1.el9_3, kernel-rt-core-5.14.0-362.8.1.el9_3, kernel-rt-debug-5.14.0-362.8.1.el9_3 +9
- Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-362.8.1.el9_3, kernel-rt-core-5.14.0-362.8.1.el9_3, kernel-rt-debug-5.14.0-362.8.1.el9_3 +11

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Enterprise Linux 8	Affected	No fix planned: Will not fix
Red Hat Enterprise Linux 9	Affected	No fix yet

Not affected: 2 products

Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7

Timeline

2026-10-02 Threatist record created from CVE-2023-3640
2026-10-03 Alias added: GHSA-g854-mv2r-2r5h

References

Advisory 3

TI-2019-08259 Underflow in PHP-FPM can lead to RCE KEVCVSS 3.1CRITICAL 9.8
TI-2018-10530 Code injection in [UNKNOWN] RichFaces KEVCVSS 3.1CRITICAL 9.8
TI-2014-05975 GNU Bash through 4.3 bash43-025 processes trailing strings after certain malformed… KEVCVSS 3.1CRITICAL 9.8
TI-2014-05157 GNU Bash through 4.3 processes trailing strings after function definitions in the values… KEVCVSS 3.1CRITICAL 9.8
TI-2025-23530 Sudo before 1.9.17p1 allows local users to obtain root access because /etc/nsswitch.conf… KEVCVSS 3.1CRITICAL 9.3
TI-2021-17490 mod_proxy SSRF KEVCVSS 3.1CRITICAL 9.0

See all 1955 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences