HighCVE-2024-58083

    Linux Kernel: Use-After-Free (CVE-2024-58083)

    Published Last modified Sources: BSI, SUSE, Debian LTS, Siemens ProductCERT, Red Hat, CVE.org, Msrc Update Guide, EUVD

    What is affected, what to do

    In the Linux kernel, the following vulnerability has been resolved: KVM: Explicitly verify target vCPU is online in kvm_get_vcpu() Explicitly verify the target vCPU is fully online _prior_ to clamping the index in kvm_get_vcpu(). If the index is "bad", the nospec clamping will generate '0', i.e.

    The available sources name no fixed version. Check the vendor guidance in the references below.

    Conflicting version data — version display is hidden until the data is resolved.

    Not sure whether and how you are affected? Ask a question about this vulnerability

    Metrics

    7.8

    Priority

    XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

    Source: NVD, CVSS v3

    7.8

    CVSS v3

    Severity High on the scale from 0 to 10.

    Source: BSI, SUSE, Debian LTS, Siemens ProductCERT, Red Hat, CVE.org, Msrc Update Guide, EUVD

    0.2 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 13.1

    Show all metrics
    Severity
    High
    Priority (0–325)

    The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?

    Read in glossary
    48.47 Methodology
    Exploit maturity

    An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.

    Read in glossary
    no public PoC known
    XIEM Effective CVSS

    XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.

    Read in glossary
    7.8 Methodology
    CVSS v3

    CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.

    Read in glossary
    7.8
    EPSS score

    The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“.

    Read in glossary
    0.2 %
    Low — model estimates < 1% exploitation likelihood.
    EPSS percentile

    The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking.

    Read in glossary
    13.1
    Elevated — this CVE ranks above at least 10% of all CVEs scored today.
    KEV status

    The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.

    Read in glossary
    —
    Published
    CISA assessment (SSVC)
    Exploitation: none known · not automatable · Technical impact: total
    Source: CISA Vulnrichment, as of 27 March 2025
    CWE

    CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect.

    Read in glossary
    CWE-416

    Detection rules

    No NEOSEC detection rule is available for this vulnerability yet.

    Classification under NIS2 and CRA

    Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

    NIS2

    NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.

    Read in glossary
    High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
    CRA

    The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.

    Read in glossary
    From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
    ISO/IEC 27001

    ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.

    Read in glossary
    Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

    Description

    In the Linux kernel, the following vulnerability has been resolved: KVM: Explicitly verify target vCPU is online in kvm_get_vcpu() Explicitly verify the target vCPU is fully online _prior_ to clamping the index in kvm_get_vcpu(). If the index is "bad", the nospec clamping will generate '0', i.e. KVM will return vCPU0 instead of NULL. In practice, the bug is unlikely to cause problems, as it will only come into play if userspace or the guest is buggy or misbehaving, e.g. KVM may send interrupts to vCPU0 instead of dropping them on the floor. However, returning vCPU0 when it shouldn't exist per online_vcpus is problematic now that KVM uses an xarray for the vCPUs array, as KVM needs to insert into the xarray before publishing the vCPU to userspace (see commit c5b077549136 ("KVM: Convert the kvm->vcpus array to a xarray")), i.e. before vCPU creation is guaranteed to succeed. As a result, incorrectly providing access to vCPU0 will trigger a use-after-free if vCPU0 is dereferenced and kvm_vm_ioctl_create_vcpu() bails out of vCPU creation due to an error and frees vCPU0. Commit afb2acb2e3a3 ("KVM: Fix vcpu_array[0] races") papered over that issue, but in doing so introduced an unsolvable teardown conundrum. Preventing accesses to vCPU0 before it's fully online will allow reverting commit afb2acb2e3a3, without re-introducing the vcpu_array[0] UAF race.

    Source: BSI WID Portal, BSI CSAF, suse_csaf, Debian LTS Advisories, siemens_advisory, redhat_csaf, NVD (NIST), CVE.org (MITRE), cvelistv5, Microsoft Security Update Guide, ENISA EUVD

    Affected products

    The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

    Affected products
    Affected versionsFixed in
    LinuxLinux
    • 5.5 – < 5.10.235
    • 4.14.120 – < 4.15
    • —
    • 5.16 – < 6.1.129
    • 5.11 – < 5.15.179
    • 6.7 – < 6.12.14
    • 6.2 – < 6.6.78
    • 5.0.17 – < 5.1
    • 6.13 – < 6.13.3
    • 4.19.44 – < 4.20
    • 5.1 – < 5.4.291
    • 5.10.235
    • 4.15
    • 6.14
    • 6.1.129
    • 5.15.179
    • 6.12.14
    • 6.6.78
    • 5.1
    • 6.13.3
    • 4.20
    • 5.4.291
    DellSecure Connect Gateway
    • < 5.30.0.14
    • 5.30.0.14
    IBMSecurity Verify Access
    • < 10.0.9.2
    • 10.0.9.2
    SiemensSIMATIC S7
    • 1500 TM MFP V1.1.1 GNU/Linux subsystem
    • —

    Vendors and products

    Affected operating systems

    Affected operating systems
    Linuxdebianlinuxbullseye
    Linuxdebianlinux-6.1bullseye
    Linuxlinuxlinux_kernel—

    Weakness classes (CWE)

    • CWE-416Use After Free

      Variant

      The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

      Entry at MITRE CWE-416

    References & sources

    Changes to this CVE

    Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

    1. Record modifiedLinux

      CVSS V3.1: AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

      Show 25 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      CVSSadded
      —
      AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
      Referenceadded
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      https://git.kernel.org/stable/c/09d50ccf0b2d739db4a485b08afe7520a4402a63
      Referenceadded
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      https://git.kernel.org/stable/c/125da53b3c0c9d7f58353aea0076e9efd6498ba7
      Referenceadded
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      https://git.kernel.org/stable/c/1e7381f3617d14b3c11da80ff5f8a93ab14cfc46
      Referenceadded
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      https://git.kernel.org/stable/c/5cce2ed69b00e022b5cdf0c49c82986abd2941a8
      Referenceadded
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      https://git.kernel.org/stable/c/7c4899239d0f70f88ac42665b3da51678d122480
      Referenceadded
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      https://git.kernel.org/stable/c/ca8da90ed1432ff3d000de4f1e2275d4e7d21b96
      Referenceadded
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      https://git.kernel.org/stable/c/d817e510662fd1c9797952408d94806f97a5fffd
      Referenceadded
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      https://git.kernel.org/stable/c/f2f805ada63b536bc192458a7098388286568ad4
      Referenceremoved
      https://git.kernel.org/stable/c/09d50ccf0b2d739db4a485b08afe7520a4402a63
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      Referenceremoved
      https://git.kernel.org/stable/c/125da53b3c0c9d7f58353aea0076e9efd6498ba7
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      Referenceremoved
      https://git.kernel.org/stable/c/1e7381f3617d14b3c11da80ff5f8a93ab14cfc46
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      Referenceremoved
      https://git.kernel.org/stable/c/5cce2ed69b00e022b5cdf0c49c82986abd2941a8
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      Referenceremoved
      https://git.kernel.org/stable/c/7c4899239d0f70f88ac42665b3da51678d122480
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      Referenceremoved
      https://git.kernel.org/stable/c/ca8da90ed1432ff3d000de4f1e2275d4e7d21b96
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      Referenceremoved
      https://git.kernel.org/stable/c/d817e510662fd1c9797952408d94806f97a5fffd
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      Referenceremoved
      https://git.kernel.org/stable/c/f2f805ada63b536bc192458a7098388286568ad4
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/09d50ccf0b2d739db4a485b08afe7520a4402a63 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/125da53b3c0c9d7f58353aea0076e9efd6498ba7 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/1e7381f3617d14b3c11da80ff5f8a93ab14cfc46 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/5cce2ed69b00e022b5cdf0c49c82986abd2941a8 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/7c4899239d0f70f88ac42665b3da51678d122480 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/ca8da90ed1432ff3d000de4f1e2275d4e7d21b96 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/d817e510662fd1c9797952408d94806f97a5fffd Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/f2f805ada63b536bc192458a7098388286568ad4 Types: Patch
      —

      Source identifier: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    2. Record modifiedCVE Program

      Show 4 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html
      Referenceadded
      —
      https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
      Referenceremoved
      https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html
      —
      Referenceremoved
      https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
      —

      Source identifier: af854a3a-2127-422b-91ae-364da2661108

    3. Record modifiedSiemens ADP

      Show 2 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)added
      —
      New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2024/58xxx/CVE-2024-58083.json">CVE-2024-58083</a>
      Referenceadded
      —
      https://cert-portal.siemens.com/productcert/html/ssa-784472.html

      Source identifier: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e

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