163 lines
8.9 KiB
JSON
163 lines
8.9 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-99099",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-09-25T10:25:14.391Z",
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"datePublished": "2026-10-26T14:52:04.997Z",
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"dateUpdated": "2026-10-31T12:42:48.094Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-31T12:42:48.094Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/CPU/AMD: Fix AMD TLBI Erratum #1718\n\nThe processor may fail to invalidate a TLB entry while executing an\nINVLPGB/TLBSYNC instruction pair.\n\nDetect the erratum and apply a software workaround when a microcode fix\nis not present."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - SYSCALL_DEFINE2(munmap)→__vm_munmap→do_vmi_munmap→do_vmi_align_munmap→vms_complete_munmap_vmas→vms_clear_ptes→unmap_region, which runs unmap_vmas then tlb_finish_mmu→tlb_flush_mmu→tlb_flush→flush_tlb_mm_range→broadcast_tlb_flush→patched __tlbsync; no wire protocol carries the trigger.\nAC:L - An attacker can keep one mm active on four CPUs and repeat munmap until consider_global_asid() assigns a broadcast ASID, prime the target TLB entry, and repeatedly exercise the faulty pair while grooming reuse. CONFIG_BROADCAST_TLB_FLUSH is default on AMD64, and all timing/setup is controlled by the attacker's threads.\nPR:L - SYSCALL_DEFINE2(munmap) reaches the path for ordinary anonymous mappings; do_vmi_munmap() only validates the range, and __vm_munmap() only locks current->mm. No capability, authentication, device permission, or privileged namespace operation is required.\nUI:N - The attacker's own threads create and touch a mapping, call munmap(), and access the stale virtual address after reuse. No victim must mount media, open a file, or perform another action.\nS:U - The failed __tlbsync() leaves a stale host CPU translation and compromises pages managed by the same host kernel. This is ordinary local kernel compromise, not a guest-to-host escape or an IOMMU-boundary bypass.\nC:H - zap_present_folio_ptes() clears the PTE and queues its folio, but tlb_finish_mmu() trusts the faulty __tlbsync() before tlb_batch_pages_flush() recycles it through free_pages_and_swap_cache(). The cached user translation can then read the recycled page, including kernel or other-process data.\nI:H - The same stale writable translation bypasses the cleared page table after free_pages_and_swap_cache() recycles the folio. Grooming that page into kernel objects or page tables provides a kernel-memory write primitive capable of control-flow hijacking.\nA:H - Writes through the stale translation can corrupt a recycled page table or kernel object and cause an oops, panic, or hang. The earlier tlbi=ipi mitigation commit also identifies this INVLPGB/TLBSYNC defect as a cause of observed userspace crashes."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"arch/x86/include/asm/cpufeatures.h",
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"arch/x86/include/asm/tlb.h",
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"arch/x86/kernel/cpu/amd.c"
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],
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"versions": [
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{
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"version": "82378c6c2f435dba66145609de16bf44a9de6303",
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"lessThan": "e3e6779f77ab6f0a1aa80e24868d2d89f31053fe",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "82378c6c2f435dba66145609de16bf44a9de6303",
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"lessThan": "098d80b04d0fe02889c332d061db968f070b83a6",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "82378c6c2f435dba66145609de16bf44a9de6303",
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"lessThan": "87db7795cbaaf636ae22ae031f4906db7bb77803",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"arch/x86/include/asm/cpufeatures.h",
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"arch/x86/include/asm/tlb.h",
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"arch/x86/kernel/cpu/amd.c"
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],
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"versions": [
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{
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"version": "6.15",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.15",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.57",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.11",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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"nodes": [
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.15",
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"versionEndExcluding": "6.18.57"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.15",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.15",
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}
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/e3e6779f77ab6f0a1aa80e24868d2d89f31053fe"
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},
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{
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"url": "https://git.kernel.org/stable/c/098d80b04d0fe02889c332d061db968f070b83a6"
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},
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{
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"url": "https://git.kernel.org/stable/c/87db7795cbaaf636ae22ae031f4906db7bb77803"
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}
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],
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"title": "x86/CPU/AMD: Fix AMD TLBI Erratum #1718",
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