{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-46174", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-13T15:03:33.103Z", "datePublished": "2026-05-28T09:36:28.703Z", "dateUpdated": "2026-08-05T12:30:12.168Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:30:12.168Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/CPU/AMD: Prevent improper isolation of shared resources in Zen2's op cache\n\nMake sure resources are not improperly shared in the op cache and\ncause instruction corruption this way." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The flaw is in the CPU's 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's 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's context into a different security authority (another VM/tenant or the host kernel), impacting resources beyond the attacking component's 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\" — 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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/x86/include/asm/msr-index.h", "arch/x86/kernel/cpu/amd.c", "tools/arch/x86/include/asm/msr-index.h" ], "versions": [ { "version": "f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9", "lessThan": "1e23b30a80b14e5764657401ee2cca030525ae8e", "status": "affected", "versionType": "git" }, { "version": "f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9", "lessThan": "f5bc3aef7df46eaaf423d7413ab8833f704ae576", "status": "affected", "versionType": "git" }, { "version": "f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9", "lessThan": "251497955f2314cd39d43191e81c6151dead4c7b", "status": "affected", "versionType": "git" }, { "version": "f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9", "lessThan": 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"affected", "versionType": "git" }, { "version": "3.16.58", "lessThan": "3.17", "status": "affected", "versionType": "semver" }, { "version": "4.4.144", "lessThan": "4.5", "status": "affected", "versionType": "semver" }, { "version": "4.9.102", "lessThan": "4.10", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/x86/include/asm/msr-index.h", "arch/x86/kernel/cpu/amd.c", "tools/arch/x86/include/asm/msr-index.h" ], "versions": [ { "version": "4.14", "status": "affected" }, { "version": "0", "lessThan": "4.14", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.256", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.207", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.173", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.139", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.88", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.30", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.7", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14", "versionEndExcluding": "5.10.256" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14", "versionEndExcluding": "5.15.207" }, { "vulnerable": true, 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