CVE-2026-46174 (GCVE-0-2026-46174)

Vulnerability from cvelistv5 – Published: 2026-05-28 09:36 – Updated: 2026-11-10 12:47
VLAI
Title
x86/CPU/AMD: Prevent improper isolation of shared resources in Zen2's op cache
Summary
In the Linux kernel, the following vulnerability has been resolved: x86/CPU/AMD: Prevent improper isolation of shared resources in Zen2's op cache Make sure resources are not improperly shared in the op cache and cause instruction corruption this way.
Severity
8.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:20 UTC
CWE
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 , < 1e23b30a80b14e5764657401ee2cca030525ae8e (git)
Affected: f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 , < f5bc3aef7df46eaaf423d7413ab8833f704ae576 (git)
Affected: f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 , < 251497955f2314cd39d43191e81c6151dead4c7b (git)
Affected: f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 , < ff6fc65b3bf73acc5ee71919154d830ad5431362 (git)
Affected: f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 , < 9109489cc8c34e50d15575a3d1ff82af586bc1aa (git)
Affected: f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 , < 28f5ed477eef166d678d6966762cbc1de9b4f436 (git)
Affected: f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 , < 1cd85a19748b2407830376a5cbae5c0f126016e5 (git)
Affected: f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 , < c21b90f77687075115d989e53a8ec5e2bb427ab1 (git)
Affected: 5abd1583e06b3963e5c9d915760367de86808b78 (git)
Affected: 4ba461d426490b6ed7e8298c4d3b7a13aa5d2686 (git)
Affected: 5a63725cd18fcee2af6ec46ccb856b64ad3077b4 (git)
Affected: 3.16.58 , < 3.17 (semver)
Affected: 4.4.144 , < 4.5 (semver)
Affected: 4.9.102 , < 4.10 (semver)
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Linux Linux Affected: 4.14
Unaffected: 0 , < 4.14 (semver)
Unaffected: 5.10.256 , ≤ 5.10.* (semver)
Unaffected: 5.15.207 , ≤ 5.15.* (semver)
Unaffected: 6.1.173 , ≤ 6.1.* (semver)
Unaffected: 6.6.139 , ≤ 6.6.* (semver)
Unaffected: 6.12.88 , ≤ 6.12.* (semver)
Unaffected: 6.18.30 , ≤ 6.18.* (semver)
Unaffected: 7.0.7 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) Affected: V3.1.6 , < * (custom)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) Affected: V3.1.5 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) Affected: V3.1.7 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) Affected: V3.1.5 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) Affected: V3.1.7 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) Affected: V3.1.5 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) Affected: V3.1.7 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) Affected: V3.1.5 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) Affected: V3.1.7 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) Affected: V3.1.6 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) Affected: V3.1.5 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) Affected: V3.1.7 , < * (custom)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/CPU/AMD: Prevent improper isolation of shared resources in Zen2\u0027s op cache\n\nMake sure resources are not improperly shared in the op cache and\ncause instruction corruption this way."
        }
      ],
      "metrics": [
        {
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The flaw is in the CPU\u0027s op cache and requires executing instructions on the affected core to drive improper resource sharing; it is not reachable over a network. Triggering it needs local code execution on the machine.\nAC:L - An attacker who can co-schedule code on SMT siblings of an affected Zen2 core controls both sides of the shared op-cache contention and can reliably drive the improper-isolation condition. Following the higher-severity rule, this is Low.\nPR:L - Triggering the op-cache resource sharing only requires the ability to run code (an unprivileged local user or a guest VM tenant); no root or admin capability is needed. It does, however, require at least some local execution access, so not None.\nUI:N - The attacker\u0027s own executing code populates and contends for the op cache; no victim action is required.\nS:C - The bug is an isolation failure of a microarchitectural resource shared across SMT threads, so instruction corruption can cross from the attacker\u0027s context into a different security authority (another VM/tenant or the host kernel), impacting resources beyond the attacking component\u0027s scope.\nC:H - Improper isolation of a shared op-cache resource is an information-disclosure vector across contexts, and the resulting instruction corruption can be leveraged to read memory belonging to another security domain.\nI:H - The defining impact is \"instruction corruption\" \u2014 the CPU executes corrupted/wrong instructions in a victim context, which is a direct, severe integrity violation enabling control-flow and data corruption across the isolation boundary.\nA:H - Instruction corruption causes incorrect execution, crashes, and hangs in the affected (potentially cross-context) code, resulting in high availability impact."
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      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2026-46174",
        "datePublished": "2026-05-28T09:36:28.703Z",
        "dateReserved": "2026-05-13T15:03:33.103Z",
        "dateUpdated": "2026-11-10T12:47:23.454Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.