CVE-2023-34320 | arm: Guests can trigger a deadlock on Cortex-A77

Cortex-A77 cores (r0p0 and r1p0) are affected by erratum 1508412 where software, under certain circumstances, could deadlock a core due to the execution of either a load to device or non-cacheable memory, and either a store exclusive or register read of the Physical Address Register (PAR_EL1) in close proximity.

Published: 2023-12-08 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-34320 is rated Low Risk (26.4/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.22%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2023-34320

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.07% 0.22% +0.15%
2 2025-11-01 0.04% 0.07% +0.02%
3 2025-04-15 — 0.04% —

Full EPSS history (5 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-34320

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.5 3.1 MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 3.6 [email protected]

Weakness enumeration for CVE-2023-34320

OS Trackers for CVE-2023-34320

vendor priority summary link
alpine — CVE-2023-34320: 1 source package rows (xen); 8 state rows across 7 repos (3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 8, open 0. https://security.alpinelinux.org/vuln/CVE-2023-34320
debian end-of-life CVE-2023-34320 end-of-life priority: Debian including 1 source packages (xen), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 4, open 1. https://security-tracker.debian.org/tracker/CVE-2023-34320
gentoo normal CVE-2023-34320: 1 GLSA(s) (202409-10), 1 atom(s) (app-emulation/xen); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2023-34320
suse medium CVE-2023-34320 severity moderate: SUSE including 8 source package names (xen, xen-devel, …), 180 product×package rows across 40 product lines (SUSE CaaS Platform 4.0, SUSE Enterprise Storage 7.1, … (40 product lines)): Will Not Fix 180. https://www.suse.com/security/cve/CVE-2023-34320/
ubuntu medium CVE-2023-34320 medium priority: Ubuntu including 1 source packages (xen), 12 status rows across 12 suites (bionic, focal, jammy, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): needs-triage 7, ignored 5. https://ubuntu.com/security/CVE-2023-34320

Affected software / configurations for CVE-2023-34320

Vendor Product Version Raw CPE
arm cortex-a77_firmware r0p0 cpe:2.3:o:arm:cortex-a77_firmware:r0p0:*:*:*:*:*:*:*
arm cortex-a77_firmware r1p0 cpe:2.3:o:arm:cortex-a77_firmware:r1p0:*:*:*:*:*:*:*
xen xen — cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:*

References for CVE-2023-34320

cvelogic Threat Intelligence