{"id":"CVE-2026-98715","aliases":[],"cve":{"records":[{"id":"CVE-2026-98715","source":"Linux","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-09-25T10:25:14.366Z","published":"2026-10-18T15:46:47.988Z","modified":"2026-11-10T18:15:18.805Z"}],"publishers":[{"name":"Linux","role":"CNA","organizationId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","modified":"2026-11-10T18:15:18.805Z"}],"references":[{"url":"https://git.kernel.org/stable/c/bfe48e689ba011d3d6cf8adcca03072aa0430133","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/f2bd7cf6a83e49c710e2b93d3064fa0ebb7e0006","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/fd873c3d1b5240e80365f09e758e8c96b88a7cdb","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/60d93c27859fb3ec5b5a689e24de303f166477d0","tags":[],"source":"Linux"}],"weaknesses":[],"applicability":[{"source":"Linux","statements":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.38","versionEndExcluding":"6.12.117"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.38","versionEndExcluding":"6.18.61"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.38","versionEndExcluding":"7.2.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.38","versionEndExcluding":"7.3"}]}]}]}],"prioritization":[]},"title":"KVM: SVM: Preserve TLB control (i.e. pending TLB flush) on failed VMRUN","titleSource":"Linux","descriptionSource":"Linux","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SVM: Preserve TLB control (i.e. pending TLB flush) on failed VMRUN\n\nDon't reset the VMCB's TLB control back to \"do nothing\" on a failed VMRUN,\nas empirical testing shows that the CPU performs the requested TLB flush if\nand only if VMRUN is successful, i.e. clearing TLB control on a failed\nVMRUN effectively drops a TLB flush.\n\nExplicitly track the need to flush all ASIDs on a per-CPU basis, as the\nASID reuse condition is tied to the pCPU, not to the vCPU.  As a bonus,\nthis also obviates the need to avoid clobbering FLUSH_ALL_ASID with\nTLB_CONTROL_FLUSH_ASID, e.g. in svm_flush_tlb_asid().\n\nDeliberately don't bother saving/restoring the \"old\" tlb_ctl on failure,\nin quotes because it's not exactly the old tlb_ctl, it's the tlb_ctl from\nafter pre_svm_run(), but before updating tlb_ctl for flush_all_asids.  If\nVMRUN fails and TLB_CONTROL_FLUSH_ALL_ASID is forced, then the next\nsuccessful run of the VMCB *may* unnecessarily flush all ASIDs, which\nstrictly speaking could result in noisy neighbor issues.  However, the\nfact that new_asid() is already guest-triggerable, because of KVM's flawed\nbehavior of clearing the ASID on emulated INIT, means that a guest can\nalready trigger a flush of all ASIDs at roughly the same rate.  And once\nKVM stops clobbering the ASID on emulated INIT, *or* assigns a static ASID\nto each vCPU, this flaw goes away.","score":null,"severity":"unknown","published":"2026-10-18T15:46:47.988Z","modified":"2026-11-10T18:15:18.805Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"Linux","name":"Linux","platforms":[],"versions":[{"version":"38e5e92fe8c02a8766459d505423b855caf9af1f","status":"affected","lessThan":"bfe48e689ba011d3d6cf8adcca03072aa0430133","versionType":"git"},{"version":"38e5e92fe8c02a8766459d505423b855caf9af1f","status":"affected","lessThan":"f2bd7cf6a83e49c710e2b93d3064fa0ebb7e0006","versionType":"git"},{"version":"38e5e92fe8c02a8766459d505423b855caf9af1f","status":"affected","lessThan":"fd873c3d1b5240e80365f09e758e8c96b88a7cdb","versionType":"git"},{"version":"38e5e92fe8c02a8766459d505423b855caf9af1f","status":"affected","lessThan":"60d93c27859fb3ec5b5a689e24de303f166477d0","versionType":"git"}],"defaultStatus":"unaffected","cpes":[],"source":"Linux","url":"https://www.cve.org/CVERecord?id=CVE-2026-98715"},{"vendor":"Linux","name":"Linux","platforms":[],"versions":[{"version":"2.6.38","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.38","versionType":"semver"},{"version":"6.12.117","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.61","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.10","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"defaultStatus":"affected","cpes":[],"source":"Linux","url":"https://www.cve.org/CVERecord?id=CVE-2026-98715"}],"remediation":[],"references":["https://git.kernel.org/stable/c/bfe48e689ba011d3d6cf8adcca03072aa0430133","https://git.kernel.org/stable/c/f2bd7cf6a83e49c710e2b93d3064fa0ebb7e0006","https://git.kernel.org/stable/c/fd873c3d1b5240e80365f09e758e8c96b88a7cdb","https://git.kernel.org/stable/c/60d93c27859fb3ec5b5a689e24de303f166477d0"],"sources":[{"name":"CVE","id":"CVE-2026-98715","modified":"2026-11-10T18:15:18.805Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-98715"}],"assessments":[],"sourceAffected":[],"observedAt":"2026-11-10T18:25:19.095Z","kev":{"status":"not-listed","checkedAt":"2026-11-14T22:50:32.984Z"},"coverage":[{"source":"NVD","status":"available","checkedAt":"2026-11-07T02:30:43.895Z","attemptedAt":"2026-11-07T02:30:43.895Z"},{"source":"GHSA","status":"available","checkedAt":"2026-11-07T02:30:43.960Z","attemptedAt":"2026-11-07T02:30:43.960Z"},{"source":"EUVD","status":"available","checkedAt":"2026-11-07T02:30:42.612Z","attemptedAt":"2026-11-07T02:30:42.612Z"},{"source":"EPSS","status":"available","checkedAt":"2026-11-07T02:30:42.804Z","attemptedAt":"2026-11-07T02:30:42.804Z"}],"evidence":[{"source":"ENISA EUVD","id":"EUVD-2026-103969","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-103969","modified":"Nov 6, 2026, 5:15:05 PM","checkedAt":"2026-11-07T02:30:42.612Z"},{"source":"FIRST EPSS","id":"CVE-2026-98715","url":"https://www.first.org/epss/","probability":0.00189,"percentile":0.08618,"date":"2026-11-06","checkedAt":"2026-11-07T02:30:42.804Z"},{"source":"NVD","id":"CVE-2026-98715","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98715","modified":"2026-11-06T18:18:30.193","checkedAt":"2026-11-07T02:30:43.895Z"},{"source":"GitHub Advisory Database","id":"GHSA-j396-gv6v-75wx","url":"https://github.com/advisories/GHSA-j396-gv6v-75wx","modified":"2026-11-06T18:34:53Z","checkedAt":"2026-11-07T02:30:43.960Z"}],"aiSummary":null}