CriticalCVE-2026-46316

    Linux Kernel: security vulnerability (CVE-2026-46316)

    Published Last modified Sources: Red Hat, Ubuntu, Debian, SUSE, CVE.org, BSI

    What is affected, what to do

    In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: vgic-its: Drop the translation cache reference only for the erased entry vgic_its_invalidate_cache() walks the per-ITS translation cache with xa_for_each() and drops the cache's reference on each entry with vgic_put_irq(). It puts the iterated pointer, though, rather than the value returned by xa_erase().

    An exploit is publicly available. Update Linux Kernel to version 6.12.93, Linux Kernel to version 6.18.35, Linux Kernel to version 7.0.12.

    Affected
    • Linux Kernel lt 6.10..6.12.93
    • Linux Kernel lt 6.13..6.18.35
    • Linux Kernel lt 6.19..7.0.12
    Fixed in
    • Linux Kernel 6.12.93
    • Linux Kernel 6.18.35
    • Linux Kernel 7.0.12
    • Linux Kernel 7.1

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

    Metrics

    9.3

    Priority

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

    Source: NVD, CVSS v3

    9.3

    CVSS v3

    Severity Critical on the scale from 0 to 10.

    Source: Red Hat, Ubuntu, Debian, SUSE, CVE.org, BSI

    0.3 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 27.1

    Show all metrics
    Severity
    Critical
    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
    71.00 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
    PoC (publicly reported)
    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
    9.3 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
    9.3
    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
    0.3 %
    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
    27.1
    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 16 October 2026
    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-362

    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: arm64: vgic-its: Drop the translation cache reference only for the erased entry vgic_its_invalidate_cache() walks the per-ITS translation cache with xa_for_each() and drops the cache's reference on each entry with vgic_put_irq(). It puts the iterated pointer, though, rather than the value returned by xa_erase(). The function is called from contexts that do not exclude one another: the ITS command handlers hold its_lock, the GITS_CTLR write path holds cmd_lock, and the path that clears EnableLPIs in a redistributor's GICR_CTLR holds neither. Two or more of them can drain the same cache concurrently, and if each one observes the same entry, erases it and then puts it, the single reference the cache holds on that entry is dropped more than once. The entry can then be freed while an ITE still maps it. xa_erase() is atomic and returns the previous entry, so put only the entry that this context actually removed. The cache reference is then dropped exactly once per entry even when the invalidations run concurrently, and the behavior is unchanged when only one context runs.

    Source: redhat_csaf, Ubuntu Security Notices, Debian Security Advisories, suse_csaf, NVD (NIST), CVE.org (MITRE), cvelistv5, BSI WID Portal, BSI CSAF

    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
    • 6.10 – < 6.12.93
    • 6.13 – < 6.18.35
    • 6.19 – < 7.0.12
    • —
    • 6.12.93
    • 6.18.35
    • 7.0.12
    • 7.1

    Vendors and products

    Affected operating systems

    Affected operating systems
    Linuxdebianlinuxtrixie
    Linuxlinuxlinux_kernel7.1
    Linuxlinuxlinux_kernel—

    Weakness classes (CWE)

    • CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

      Class

      The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

      Entry at MITRE CWE-362

    Public exploit references

    Publicly reported proof-of-concepts, exploit modules and detection templates for this vulnerability. NEOSEC links to the original sources only and does not provide any exploit code.

    Public exploit references
    PoC-in-GitHub (nomi-sec)itscape (opens in a new tab)github.comPoC (publicly reported)reported, not verified

    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 modifiedCISA ADP

      Weakness type: CWE-362

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Weakness type (CWE)added
      —
      CWE-362

      Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

    2. Record modifiedCISA ADP

      CISA assessment (SSVC): exploitation: none known, automatable: no

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      SSVC assessmentadded
      —
      {"id":"CVE-2026-46316","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:21:53.264674Z"}

      Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

    3. Record modifiedLinux

      Show 12 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://git.kernel.org/stable/c/13031fb6b8357fbbcded2a7f4cba73e4781ee594
      Referenceadded
      —
      https://git.kernel.org/stable/c/2bbc395e81bd29c543a0529a678327e932a7ec69
      Referenceadded
      —
      https://git.kernel.org/stable/c/9121f4605ab94969f62d1b5714ca3c6c69bd202f
      Referenceadded
      —
      https://git.kernel.org/stable/c/b7b72e88046328c9fdc638fe887d4240257dd5dc
      Referenceremoved
      https://git.kernel.org/stable/c/13031fb6b8357fbbcded2a7f4cba73e4781ee594
      —
      Referenceremoved
      https://git.kernel.org/stable/c/2bbc395e81bd29c543a0529a678327e932a7ec69
      —
      Referenceremoved
      https://git.kernel.org/stable/c/9121f4605ab94969f62d1b5714ca3c6c69bd202f
      —
      Referenceremoved
      https://git.kernel.org/stable/c/b7b72e88046328c9fdc638fe887d4240257dd5dc
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/13031fb6b8357fbbcded2a7f4cba73e4781ee594 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/2bbc395e81bd29c543a0529a678327e932a7ec69 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/9121f4605ab94969f62d1b5714ca3c6c69bd202f Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/b7b72e88046328c9fdc638fe887d4240257dd5dc Types: Patch
      —

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

    4. Record modifiedRed Hat ADP

      Show 28 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)added
      —
      Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/46xxx/CVE-2026-46316.json">CVE-2026-46316</a>
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:34911
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:36018
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:38902
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:39371
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:40764
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:40779
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:40787
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:44231
      Referenceadded
      —
      https://access.redhat.com/security/cve/CVE-2026-46316
      Referenceadded
      —
      https://bugzilla.redhat.com/show_bug.cgi?id=2486982
      Referenceadded
      —
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46316.json
      Referenceremoved
      https://access.redhat.com/errata/RHSA-2026:34911
      —
      Referenceremoved
      https://access.redhat.com/errata/RHSA-2026:36018
      —
      Referenceremoved
      https://access.redhat.com/errata/RHSA-2026:38902
      —
      Referenceremoved
      https://access.redhat.com/errata/RHSA-2026:39371
      —
      Referenceremoved
      https://access.redhat.com/errata/RHSA-2026:40764
      —
      Referenceremoved
      https://access.redhat.com/errata/RHSA-2026:40779
      —
      Referenceremoved
      https://access.redhat.com/errata/RHSA-2026:40787
      —
      Referenceremoved
      https://access.redhat.com/errata/RHSA-2026:44231
      —
      Referenceremoved
      https://access.redhat.com/security/cve/CVE-2026-46316
      —
      Referenceremoved
      https://bugzilla.redhat.com/show_bug.cgi?id=2486982
      —
      Referenceremoved
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46316.json
      —
      Reference typeremoved
      https://access.redhat.com/errata/RHSA-2026:34911 Types: Third Party Advisory
      —
      Reference typeremoved
      https://access.redhat.com/errata/RHSA-2026:36018 Types: Third Party Advisory
      —
      Reference typeremoved
      https://access.redhat.com/security/cve/CVE-2026-46316 Types: Third Party Advisory
      —
      Reference typeremoved
      https://bugzilla.redhat.com/show_bug.cgi?id=2486982 Types: Third Party Advisory
      —
      Reference typeremoved
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46316.json Types: Third Party Advisory
      —

      Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

    5. Record modifiedRed Hat ADP

      Show 2 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:44231
      Affected versions (publisher)changed
      Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 9 (+11)
      Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 9 (+12)

      Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

    Show 2 older changes

    1. Record modifiedRed Hat ADP

      Show 4 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:40764
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:40779
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:40787
      Affected versions (publisher)changed
      Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 9 (+9)
      Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 9 (+11)

      Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

    2. Record modifiedRed Hat ADP

      Show 2 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:34911
      Affected versions (publisher)changed
      Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 6 (+2)
      Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) (+6)

      Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

    One NVD translation into another language is hidden.

    Linked advisories

    Embed badge

    Show the severity and KEV status of this vulnerability on your site – with a link back here. The image is updated hourly.

    Badge preview for CVE-2026-46316
    <a href="https://intel.neosec.eu/en/cve/CVE-2026-46316"><img src="https://intel.neosec.eu/badge/cve/CVE-2026-46316.svg?lang=en" alt="CVE-2026-46316 – NEOSEC Intel" height="20"></a>