{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-40300", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T07:20:57.185Z", "datePublished": "2025-09-11T16:49:24.809Z", "dateUpdated": "2026-06-11T18:44:14.417Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-23T16:02:01.395Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/vmscape: Add conditional IBPB mitigation\n\nVMSCAPE is a vulnerability that exploits insufficient branch predictor\nisolation between a guest and a userspace hypervisor (like QEMU). Existing\nmitigations already protect kernel/KVM from a malicious guest. Userspace\ncan additionally be protected by flushing the branch predictors after a\nVMexit.\n\nSince it is the userspace that consumes the poisoned branch predictors,\nconditionally issue an IBPB after a VMexit and before returning to\nuserspace. Workloads that frequently switch between hypervisor and\nuserspace will incur the most overhead from the new IBPB.\n\nThis new IBPB is not integrated with the existing IBPB sites. For\ninstance, a task can use the existing speculation control prctl() to\nget an IBPB at context switch time. With this implementation, the\nIBPB is doubled up: one at context switch and another before running\nuserspace.\n\nThe intent is to integrate and optimize these cases post-embargo.\n\n[ dhansen: elaborate on suboptimal IBPB solution ]" } ], "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/cpufeatures.h", "arch/x86/include/asm/entry-common.h", "arch/x86/include/asm/nospec-branch.h", "arch/x86/kernel/cpu/bugs.c", "arch/x86/kvm/x86.c" ], "versions": [ { "version": "15d45071523d89b3fb7372e2135fbd72f6af9506", "lessThan": "ac60717f9a8d21c58617d0b34274babf24135835", "status": "affected", "versionType": "git" }, { "version": "15d45071523d89b3fb7372e2135fbd72f6af9506", "lessThan": "c08192b5d6730a914dee6175bc71092ee6a65f14", "status": "affected", "versionType": "git" }, { "version": "15d45071523d89b3fb7372e2135fbd72f6af9506", "lessThan": "d5490dfa35427a2967e00a4c7a1b95fdbc8ede34", "status": "affected", "versionType": "git" }, { "version": "15d45071523d89b3fb7372e2135fbd72f6af9506", "lessThan": "2f4f2f8f860cb4c3336a7435ebe8dcfded0c9c6e", "status": "affected", "versionType": "git" }, { "version": "15d45071523d89b3fb7372e2135fbd72f6af9506", "lessThan": "15006289e5c38b2a830e1fba221977a27598176c", "status": "affected", "versionType": "git" }, { "version": "15d45071523d89b3fb7372e2135fbd72f6af9506", "lessThan": "893387c18612bb452336a5881da0d015a7e8f4a2", "status": "affected", "versionType": "git" }, { "version": "15d45071523d89b3fb7372e2135fbd72f6af9506", "lessThan": "f866eef8d1c65504d30923c3f14082ad294d0e6d", "status": "affected", "versionType": "git" }, { "version": "15d45071523d89b3fb7372e2135fbd72f6af9506", "lessThan": "34e5667041050711a947e260fc9ebebe08bddee5", "status": "affected", "versionType": "git" }, { "version": "15d45071523d89b3fb7372e2135fbd72f6af9506", "lessThan": "d7ddc93392e4a7ffcccc86edf6ef3e64c778db52", "status": "affected", "versionType": "git" }, { "version": "15d45071523d89b3fb7372e2135fbd72f6af9506", "lessThan": "459274c77b37ac63b78c928b4b4e748d1f9d05c8", "status": "affected", "versionType": "git" }, { "version": "15d45071523d89b3fb7372e2135fbd72f6af9506", "lessThan": "510603f504796c3535f67f55fb0b124a303b44c8", "status": "affected", "versionType": "git" }, { "version": "15d45071523d89b3fb7372e2135fbd72f6af9506", "lessThan": "9c23a90648e831d611152ac08dbcd1283d405e7f", "status": "affected", "versionType": "git" }, { "version": "15d45071523d89b3fb7372e2135fbd72f6af9506", "lessThan": "2f8f173413f1cbf52660d04df92d0069c4306d25", "status": "affected", "versionType": "git" }, { "version": "c51f1e5f57cca88d8d5894b6fad1638f643a99d0", "status": "affected", "versionType": "git" }, { "version": "4b3870c343a82cd2df7192cc5149c87205dcc611", "status": "affected", "versionType": "git" }, { "version": "3.16.57", "lessThan": "3.17", "status": "affected", "versionType": "semver" }, { "version": "4.4.168", "lessThan": "4.5", "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/cpufeatures.h", "arch/x86/include/asm/entry-common.h", "arch/x86/include/asm/nospec-branch.h", "arch/x86/kernel/cpu/bugs.c", "arch/x86/kvm/x86.c" ], "versions": [ { "version": "4.16", "status": "affected" }, { "version": "0", "lessThan": "4.16", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.244", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.193", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.152", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.106", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.47", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.16.7", "lessThanOrEqual": "6.16.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.17", "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": "4.16", "versionEndExcluding": "5.10.244" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "5.10.244" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "5.15.193" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "5.15.193" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.1.152" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.1.152" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.6.106" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.6.106" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.12.47" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.12.47" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.16.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.16.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.17" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.16.57" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.4.168" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/ac60717f9a8d21c58617d0b34274babf24135835" }, { "url": "https://git.kernel.org/stable/c/c08192b5d6730a914dee6175bc71092ee6a65f14" }, { "url": "https://git.kernel.org/stable/c/d5490dfa35427a2967e00a4c7a1b95fdbc8ede34" }, { "url": "https://git.kernel.org/stable/c/2f4f2f8f860cb4c3336a7435ebe8dcfded0c9c6e" }, { "url": "https://git.kernel.org/stable/c/15006289e5c38b2a830e1fba221977a27598176c" }, { "url": "https://git.kernel.org/stable/c/893387c18612bb452336a5881da0d015a7e8f4a2" }, { "url": "https://git.kernel.org/stable/c/f866eef8d1c65504d30923c3f14082ad294d0e6d" }, { "url": "https://git.kernel.org/stable/c/34e5667041050711a947e260fc9ebebe08bddee5" }, { "url": "https://git.kernel.org/stable/c/d7ddc93392e4a7ffcccc86edf6ef3e64c778db52" }, { "url": "https://git.kernel.org/stable/c/459274c77b37ac63b78c928b4b4e748d1f9d05c8" }, { "url": "https://git.kernel.org/stable/c/510603f504796c3535f67f55fb0b124a303b44c8" }, { "url": "https://git.kernel.org/stable/c/9c23a90648e831d611152ac08dbcd1283d405e7f" }, { "url": "https://git.kernel.org/stable/c/2f8f173413f1cbf52660d04df92d0069c4306d25" } ], "title": "x86/vmscape: Add conditional IBPB mitigation", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html" }, { "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html" }, { "url": "http://www.openwall.com/lists/oss-security/2025/11/14/3" }, { "url": "http://www.openwall.com/lists/oss-security/2025/11/14/4" }, { "url": "http://www.openwall.com/lists/oss-security/2025/11/14/6" }, { "url": "http://www.openwall.com/lists/oss-security/2025/11/17/2" }, { "url": "http://www.openwall.com/lists/oss-security/2025/11/17/3" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-17T16:05:33.433Z" } }, { "x_adpType": "supplier", "providerMetadata": { "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-05-12T12:08:01.156Z" }, "affected": [ { "vendor": "Siemens", "product": "SIMATIC CN 4100", "versions": [ { "status": "affected", "version": "0", "lessThan": "V5.0", "versionType": "custom" } ], "defaultStatus": "unknown" } ], "references": [ { "url": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html" } ] }, { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2025-40300", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2026-06-10T20:41:37.391418Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-11T18:44:14.417Z" } } ] } }