159 lines
8.4 KiB
JSON
159 lines
8.4 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-2026-72295",
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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": "2026-08-09T03:40:39.917Z",
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"datePublished": "2026-08-15T05:55:16.590Z",
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"dateUpdated": "2026-08-17T05:42:28.074Z"
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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": "2026-08-17T05:42:28.074Z"
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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\nLoongArch: KVM: Validate irqchip index in irqfd routing\n\nSashiko reported that the irqchip index is not validated for LoongArch.\nAdd validation and reject out-of-range irqchip indexes to avoid indexing\npast the routing table's chip array."
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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:C/C:H/I:H/A:H",
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"baseScore": 8.8,
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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 - The out-of-bounds write is reached only via local KVM ioctls on /dev/kvm (KVM_CREATE_VM → KVM_SET_GSI_ROUTING with KVM_IRQ_ROUTING_IRQCHIP); no network, Bluetooth, or physical device path reaches kvm_set_routing_entry().\nAC:L - One KVM_SET_GSI_ROUTING call with irqchip>=KVM_NR_IRQCHIPS (valid pin/gsi) deterministically executes rt->chip[irqchip][pin]=gsi past the chip[] boundary; the attacker fully controls irqchip, pin, and gsi with no race or uncontrollable layout.\nPR:L - Exploitation requires only opening /dev/kvm and holding a VM fd (kvm group membership or CAP_SYS_ADMIN obtainable in a user namespace), matching unprivileged cloud tenants or QEMU service accounts—not init-namespace root.\nUI:N - No victim interaction is needed beyond the attacker's own KVM setup; a single malicious KVM_SET_GSI_ROUTING ioctl on a VM they control triggers the corruption.\nS:C - A KVM VM operator corrupts host kernel heap memory in the per-VM irq routing table from the KVM userspace interface, crossing the VM-to-host virtualization boundary rather than confining impact to the attacker's VM scope.\nC:H - Unvalidated irqchip indexes cause out-of-bounds writes past chip[] into nr_rt_entries and map[] hlist metadata in a kmalloc'd routing table; per kernel guidance such heap corruption is leverageable for host kernel memory disclosure.\nI:H - The attacker controls both the OOB index (irqchip,pin) and written value (gsi), yielding targeted corruption of routing-table pointers/state that can be steered toward host privilege escalation or code execution.\nA:H - Corrupting nr_rt_entries or map[] entries breaks subsequent irqfd/GSI routing lookups and irq injection, causing host kernel oops/panic or persistent VM/host denial of service on LoongArch KVM hosts."
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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/loongarch/kvm/irqfd.c"
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],
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"versions": [
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{
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"version": "1928254c5ccb7bdffd7f0334e1ce250e9ce4de94",
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"lessThan": "199b570d7fca1aa70e596f10a6276997becffb6d",
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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": "1928254c5ccb7bdffd7f0334e1ce250e9ce4de94",
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"lessThan": "8b3e188d19e4ffe916780aeb7ddad9d6457b8bcc",
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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": "1928254c5ccb7bdffd7f0334e1ce250e9ce4de94",
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"lessThan": "3474037904c20ff915e3ebab0ab5c1e41bbe549e",
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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/loongarch/kvm/irqfd.c"
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],
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"versions": [
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{
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"version": "6.13",
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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": "6.13",
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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": "6.18.40",
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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": "7.1.5",
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"lessThanOrEqual": "7.1.*",
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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",
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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": "6.13",
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"versionEndExcluding": "6.18.40"
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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": "6.13",
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"versionEndExcluding": "7.1.5"
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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": "6.13",
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"versionEndExcluding": "7.2"
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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/199b570d7fca1aa70e596f10a6276997becffb6d"
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},
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{
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"url": "https://git.kernel.org/stable/c/8b3e188d19e4ffe916780aeb7ddad9d6457b8bcc"
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},
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{
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"url": "https://git.kernel.org/stable/c/3474037904c20ff915e3ebab0ab5c1e41bbe549e"
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}
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],
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"title": "LoongArch: KVM: Validate irqchip index in irqfd routing",
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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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} |