Skip to main content
Public proof of conceptFix available

CVE-2023-0045

A public proof of concept exists; no exploitation attested.

  • Published2023-04-25
  • Fixed in6.1.5 · 6.0.19 · 5.15.87 · 5.10.163 · 5.4.229 · 4.19.270
  • WeaknessCWE-610

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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

Timeline

dates in UTC
  1. 2023-04-2523:15CVE publishedNVD

Versions per branch

NVD
Linux linux kernel
BranchAffectedFixed in
6.1≥ 6.1, < 6.1.56.1.5
6.0≥ 5.16, < 6.0.196.0.19
5.x≥ 5.11, < 5.15.875.15.87
5.x≥ 5.5.0, < 5.10.1635.10.163
5.4≥ 4.20, < 5.4.2295.4.229
4.19≥ 4.19.7, < 4.19.2704.19.270
4.14≥ 4.14.86, < 4.14.3034.14.303
4.x≥ 4.9.176, < 4.104.10
4.x≥ 4.4.180, < 4.54.5
3.x≥ 3.16.68, < 3.173.17
Debian debian linux
BranchAffectedFixed in
10.0= 10.0no fix published
Netapp active iq unified manager
BranchAffectedFixed in
—all versionsno fix published

5 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As Google, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Linux Kernelother versions: not affected

    package kernelhttps://git.kernel.org

    Affected
    • ≥ 9137bb27e60e, < a664ec9158eeddd75121d39c9a0758016097fa96fixed in a664ec9158eeddd75121d39c9a0758016097fa96git

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2023-04-25

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • bpftoolTuxCare:AlmaLinux:9.2all versions · fixed in 7.0.0-284.30.1.el9_2.tuxcare.els2
  • dtb-aarch64openSUSE:Leap 15.5all versions · fixed in 5.14.21-150500.55.7.1and 10 other packages
  • dtb-aarch64openSUSE:Leap 15.4all versions · fixed in 5.14.21-150400.24.55.1and 3 other packages
  • dtb-aarch64openSUSE:Leap 15.4all versions · fixed in 5.3.18-150300.59.115.1
  • kernelTuxCare:CentOS:8.5all versions · fixed in 4.18.0-348.7.1.el8_5.tuxcare.els48and 21 other packages
  • kernelTuxCare:CentOS:8.4all versions · fixed in 4.18.0-305.25.1.el8_4.tuxcare.els48and 21 other packages
  • kernelTuxCare:CentOS-Stream:8all versions · fixed in 4.18.0-553.6.1.el8_10.tuxcare.els30and 21 other packages
  • kernelTuxCare:AlmaLinux:9.2all versions · fixed in 5.14.0-284.30.1.el9_2.tuxcare.els2and 31 other packages

210 more package ranges on OSV.dev

Vendor advisories

  • CVE-2023-0045 Red Hat Product Security156 known affected

    kernel: Bypassing Spectre-BTI User Space Mitigations

    bpftool as a component of Red Hat Enterprise Linux 8 · kernel as a component of Red Hat Enterprise Linux 8 · kernel-abi-stablelists as a component of Red Hat Enterprise Linux 8 · +153 more

  • ICSA-25-044-09 CISA19 known affected

    Siemens SCALANCE W700 IEEE 802.11ax

    SCALANCE WAB762-1 (6GK5762-1AJ00-6AA0) · SCALANCE WAM763-1 (6GK5763-1AL00-7DA0) · SCALANCE WAM763-1 (ME) (6GK5763-1AL00-7DC0) · +16 more

  • SSA-769027 Siemens ProductCERT19 known affected

    SSA-769027: Multiple Vulnerabilities fixed in SCALANCE W700 IEEE 802.11ax devices before V3.0.0

    SCALANCE WAB762-1 (6GK5762-1AJ00-6AA0) · SCALANCE WAM763-1 (6GK5763-1AL00-7DA0) · SCALANCE WAM763-1 (ME) (6GK5763-1AL00-7DC0) · +16 more

Full record on NVD

Fix

  1. Update Linux linux kernel to 6.1.5 · 6.0.19 · 5.15.87 · 5.10.163 · 5.4.229 · 4.19.270 · 4.14.303 · 4.10
  2. Vendor fix Siemens ProductCERT SSA-769027 · 19 productsUpdate to V3.0.0 or later version
  3. Vendor fix CISA ICSA-25-044-09 · 19 productsUpdate to V3.0.0 or later version
  4. Workaround from the vendor Red Hat Product Security CVE-2023-0045 · 156 productsFor user-mode applications, a usleep after the prctl call will force a reschedule and ensure the correct mitigation.
  5. No fix available, says the vendor Red Hat Product Security CVE-2023-0045 · 156 productsFix deferred

Advisories and patches

Detection

read 2026-11-01 01:02 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CISA-ADPSSVC decisionpoc2025-02-03
  • CNACVSS 3.14.7known since 2026-10-23
  • NVDCVSS 3.17.5read 2026-10-23
  • CNAweakness (CWE)CWE-610known since 2026-10-23
  • NVDweakness (CWE)CWE-610read 2026-10-23
  • FIRST EPSSEPSS score2.4 %2026-11-08
  • PoC-in-GitHubproof of concept2known since 2026-11-01
  • OSVaffected packages—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published
2023-04-25
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2023-0045?

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

Is CVE-2023-0045 actively exploited?

A proof-of-concept exploit exists for CVE-2023-0045, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2023-0045?

CVE-2023-0045 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Running Linux kernel? Hear about its next vulnerability

Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».

Get alerts for this productCISA KEV additions, November 2026Search CVEs

No credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database

Sources for this record