185 lines
10 KiB
JSON
185 lines
10 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-2026-98717",
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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": "2026-09-25T10:25:14.366Z",
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"datePublished": "2026-10-18T15:46:51.862Z",
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"dateUpdated": "2026-10-21T12:56:02.536Z"
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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": "2026-10-21T12:56:02.536Z"
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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\nKVM: x86/mmu: Bail from shadow walks if the root is invalid or a dummy\n\nWhen walking shadow page tables, immediately terminate the walk if the root\nis a \"dummy\" root, i.e. a root whose top-level page table is backed by the\nzero page, but otherwise doesn't exist. If memslot creation races with a\nstage-2 page fault (EPT violation or #NPF) from L2, then if the stars align,\nKVM will attempt to walk shadow page tables using the zero page and hit a\nNULL pointer deref.\n\n BUG: kernel NULL pointer dereference, address: 0000000000000021\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD 0 P4D 0\n Oops: Oops: 0000 [#1] SMP\n CPU: 30 UID: 1000 PID: 941 Comm: qemu Not tainted 7.2.0-rc2-1b731e5ded48-next-vm #1741 PREEMPTLAZY\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015\n RIP: 0010:__kvm_mmu_invalidate_addr+0xea/0x210 [kvm]\n Call Trace:\n <TASK>\n kvm_mmu_invalidate_addr+0x92/0xe0 [kvm]\n __kvm_inject_emulated_page_fault+0x67/0x80 [kvm]\n ept_page_fault+0x160/0x850 [kvm]\n kvm_mmu_do_page_fault+0x102/0x1f0 [kvm]\n kvm_mmu_page_fault+0x8e/0x6b0 [kvm]\n vmx_handle_exit+0x163/0x640 [kvm_intel]\n kvm_arch_vcpu_ioctl_run+0x960/0x2120 [kvm]\n kvm_vcpu_ioctl+0x2c7/0x970 [kvm]\n __x64_sys_ioctl+0x90/0xd0\n do_syscall_64+0x67/0x5f0\n entry_SYSCALL_64_after_hwframe+0x4b/0x53\n RIP: 0033:0x7f606d0b53bb\n\nOpportunistically harden the shadow walks against fully invalid roots, but\nWARN, as all callers are expected/required to pre-check for a valid root.\nDon't WARN in the dummy root case as the whole point of using a dummy root\nis to provide a root that's valid enough to enter the guest, i.e. it should\nJust Work for all flows except those that *need* to know about dummy roots.\n\nAlternatively, KVM could allocate a dedicated page and associated shadow\npage structure for the dummy root, which is very tempting as it such an\napproach should be more resilient against unexpected behavior. But that\nwould be a much larger and thus riskier change than simply terminating\nwalks of dummy roots."
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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/kvm/mmu/mmu.c"
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],
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"versions": [
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{
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"version": "0e3223d8d00ac05849661f1b8b476d3caca251cf",
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"lessThan": "951fce1510645ba5df38da6fb85ece5726ec347d",
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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": "0e3223d8d00ac05849661f1b8b476d3caca251cf",
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"lessThan": "e1bcabc07efd029ab414894127411129ffdb8b48",
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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": "0e3223d8d00ac05849661f1b8b476d3caca251cf",
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"lessThan": "97c1dcce17ef27853860c781f9912257e6adbf7c",
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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": "0e3223d8d00ac05849661f1b8b476d3caca251cf",
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"lessThan": "681e31f03ec9219099a66a0f6e1bc48e1b5aa914",
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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": "0e3223d8d00ac05849661f1b8b476d3caca251cf",
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"lessThan": "b6249c1d5665098c8bf12f8d3e4712bf04c775bc",
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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/kvm/mmu/mmu.c"
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],
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"versions": [
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{
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"version": "6.6",
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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": "6.6",
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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": "6.6.160",
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"lessThanOrEqual": "6.6.*",
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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": "6.12.113",
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"lessThanOrEqual": "6.12.*",
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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": "6.18.56",
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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": "7.2.10",
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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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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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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": "6.6",
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"versionEndExcluding": "6.6.160"
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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": "6.6",
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"versionEndExcluding": "6.12.113"
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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": "6.6",
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"versionEndExcluding": "6.18.56"
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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": "6.6",
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"versionEndExcluding": "7.2.10"
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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": "6.6",
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"versionEndExcluding": "7.3"
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}
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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/951fce1510645ba5df38da6fb85ece5726ec347d"
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},
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{
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"url": "https://git.kernel.org/stable/c/e1bcabc07efd029ab414894127411129ffdb8b48"
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},
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{
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"url": "https://git.kernel.org/stable/c/97c1dcce17ef27853860c781f9912257e6adbf7c"
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},
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{
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"url": "https://git.kernel.org/stable/c/681e31f03ec9219099a66a0f6e1bc48e1b5aa914"
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},
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{
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"url": "https://git.kernel.org/stable/c/b6249c1d5665098c8bf12f8d3e4712bf04c775bc"
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}
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],
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"title": "KVM: x86/mmu: Bail from shadow walks if the root is invalid or a dummy",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |