CVE-2023-0045

MEDIUMNVD 4.74.7—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 4.7 under NVD CVSS v3. EPSS exploit probability: 2.4%, top 18% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
4.7
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 2%CVSS: 4.7Exploit: NoneExposed: 0

A fix is available — apply it.

The current implementation of the prctl syscall does not issue an IBPB immediately during the syscall. The ib_prctl_set  function updates the Thread Information Flags (TIFs) for the task and updates the SPEC_CTRL MSR on the function __speculation_ctrl_update, but the IBPB is only issued on the next schedule, when the TIF bits are checked. This leaves the victim vulnerable to values already injected on the BTB, prior to the prctl syscall.  The patch that added the support for the conditional mitigation via prctl (ib_prctl_set) dates back to the kernel 4.9.176.

We recommend upgrading past commit a664ec9158eeddd75121d39c9a0758016097fa96

CVSS v3
4.7
EG Score
4.7(medium)
EG Risk
—
EPSS
82.3%
KEV
Not listed

Published

April 25, 2023

Last Modified

February 13, 2025

References (10)

Patch Availability(24)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-modules-4.4.0-1154-aws (4.4.0-1154.169) @ xenial2026-05-23ubuntu
ubuntulinux-oem-22.04a (5.17.0.1028.26) @ jammy2026-05-23ubuntu
ubuntulinux-buildinfo-6.0.0-1012-oem (6.0.0-1012.12) @ jammy2026-05-23ubuntu
ubuntulinux-oem-22.04c (6.1.0.1007.7) @ jammy2026-05-23ubuntu
ubuntulinux-image-virtual-hwe-18.04-edge (5.4.0.144.142) @ focal2026-05-23ubuntu
ubuntulinux-image-azure (4.15.0.1162.128) @ trusty2026-05-23ubuntu
ubuntulinux-image-lowlatency (4.4.0.237.243) @ xenial2026-05-23ubuntu
ubuntulinux-image-gcp-edge (5.4.0.1101.77) @ bionic2026-05-23ubuntu
ubuntulinux-image-raspi2-hwe-18.04 (5.4.0.1081.111) @ focal2026-05-23ubuntu
ubuntulinux-image-ibm-edge (5.4.0.1045.56) @ bionic2026-05-23ubuntu
ubuntulinux-image-azure-lts-18.04 (4.15.0.1162.130) @ bionic2026-05-23ubuntu
ubuntulinux-tools-raspi-hwe-18.04-edge (5.4.0.1081.78) @ bionic2026-05-23ubuntu
ubuntulinux-gcp (4.15.0.1147.137) @ xenial2026-05-23ubuntu
ubuntulinux-headers-bluefield (5.4.0.1059.54) @ focal2026-05-23ubuntu
ubuntulinux-modules-5.15.0-1027-intel-iotg (5.15.0-1027.32) @ jammy2026-05-23ubuntu
ubuntulinux-image-gcp-lts-18.04 (4.15.0.1147.161) @ bionic2026-05-23ubuntu
ubuntulinux-gke-edge (5.15.0.1029.34~20.04.1) @ focal2026-05-23ubuntu
ubuntulinux-snapdragon-headers-4.15.0-1148 (4.15.0-1148.158) @ bionic2026-05-23ubuntu
ubuntulinux-tools-5.19.0-1021-lowlatency-64k (5.19.0-1021.22) @ kinetic2026-05-23ubuntu
ubuntulinux-modules-ipu6-5.19.0-38-generic (5.19.0-38.39~22.04.1) @ jammy2026-05-23ubuntu
ubuntulinux-headers-azure-edge (4.15.0.1162.146) @ xenial2026-05-23ubuntu
ubuntulinux-tools-4.15.0-208-generic (4.15.0-208.219~16.04.1) @ xenial2026-05-23ubuntu
ubuntulinux-gcp-headers-5.15.0-1031 (5.15.0-1031.38) @ jammy2026-05-23ubuntu
ubuntulinux-image-lowlatency (4.15.0.208.191) @ bionic2026-05-23ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(24)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 13× in last 7d / 48× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 103 total refreshes for this CVE.

  1. 2026-07-22 23:04 UTCEG score recompute
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Publicly available exploits

(2 references)

Working exploit code is in the public domain (2 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2023-0045?
CVE-2023-0045 is a medium vulnerability published on April 25, 2023. The current implementation of the prctl syscall does not issue an IBPB immediately during the syscall. The ibprctlset function updates the Thread Information Flags (TIFs) for the task and updates the SPECCTRL MSR on the function speculationctrlupdate, but the IBPB is only issued on the next…
When was CVE-2023-0045 disclosed?
CVE-2023-0045 was first published in the National Vulnerability Database on April 25, 2023, with the most recent update on February 13, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-0045 actively exploited?
CVE-2023-0045 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 82.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-0045?
CVE-2023-0045 has a CVSS v3 base score of 4.7 (NVD).
How do I remediate CVE-2023-0045?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-0045, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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