CVE-2026-46174 (GCVE-0-2026-46174)
Vulnerability from cvelistv5
Published
2026-05-28 09:36
Modified
2026-08-05 12:30
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.
Impacted products
Vendor Product Version
Linux Linux Version: f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9
Version: f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9
Version: f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9
Version: f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9
Version: f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9
Version: f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9
Version: f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9
Version: f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9
Version: 5abd1583e06b3963e5c9d915760367de86808b78
Version: 4ba461d426490b6ed7e8298c4d3b7a13aa5d2686
Version: 5a63725cd18fcee2af6ec46ccb856b64ad3077b4
Version: 3.16.58   
Version: 4.4.144   
Version: 4.9.102   
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Show details on NVD website


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              "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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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46174",
    "datePublished": "2026-05-28T09:36:28.703Z",
    "dateReserved": "2026-05-13T15:03:33.103Z",
    "dateUpdated": "2026-08-05T12:30:12.168Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
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