{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-72295","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-09T03:40:39.917Z","datePublished":"2026-08-15T05:55:16.590Z","dateUpdated":"2026-08-17T05:42:28.074Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-17T05:42:28.074Z"},"descriptions":[{"lang":"en","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."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","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."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/loongarch/kvm/irqfd.c"],"versions":[{"version":"1928254c5ccb7bdffd7f0334e1ce250e9ce4de94","lessThan":"199b570d7fca1aa70e596f10a6276997becffb6d","status":"affected","versionType":"git"},{"version":"1928254c5ccb7bdffd7f0334e1ce250e9ce4de94","lessThan":"8b3e188d19e4ffe916780aeb7ddad9d6457b8bcc","status":"affected","versionType":"git"},{"version":"1928254c5ccb7bdffd7f0334e1ce250e9ce4de94","lessThan":"3474037904c20ff915e3ebab0ab5c1e41bbe549e","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/loongarch/kvm/irqfd.c"],"versions":[{"version":"6.13","status":"affected"},{"version":"0","lessThan":"6.13","status":"unaffected","versionType":"semver"},{"version":"6.18.40","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.5","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","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":"6.13","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"7.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/199b570d7fca1aa70e596f10a6276997becffb6d"},{"url":"https://git.kernel.org/stable/c/8b3e188d19e4ffe916780aeb7ddad9d6457b8bcc"},{"url":"https://git.kernel.org/stable/c/3474037904c20ff915e3ebab0ab5c1e41bbe549e"}],"title":"LoongArch: KVM: Validate irqchip index in irqfd routing","x_generator":{"engine":"bippy-1.2.0"}}}}