{"id":"CVE-2026-89907","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nLoongArch: KVM: Validate MSI data before routing it to EIOINTC\n\npch_msi_set_irq() passes e->msi.data straight into eiointc_set_irq() as\nthe irq number","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nLoongArch: KVM: Validate MSI data before routing it to EIOINTC\n\npch_msi_set_irq() passes e->msi.data straight into eiointc_set_irq() as\nthe irq number. The MSI data com…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= 1928254c5ccb7bdffd7f0334e1ce250e9ce4de94 < 83715a40a2d30d23719e0b25380ba82ff905195b","Linux >= 1928254c5ccb7bdffd7f0334e1ce250e9ce4de94 < 501514d6ebd2111c353a1296f25dbe22fbd64657","Linux 6.13"],"published":"2026-09-16","updated":"2026-09-16","sourceUpdated":"2026-09-16T15:18:16.810","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-89907","references":[{"url":"https://git.kernel.org/stable/c/501514d6ebd2111c353a1296f25dbe22fbd64657","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/83715a40a2d30d23719e0b25380ba82ff905195b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-16T10:53:53.976Z","epss":0.00154,"epssPercentile":0.04922,"slug":"CVE-2026-89907","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nLoongArch: KVM: Validate MSI data before routing it to EIOINTC\n\npch_msi_set_irq() passes e->msi.data straight into eiointc_set_irq() as\nthe irq number. The MSI data comes from userspace, that either via a\nKVM_IRQ_ROUTING_MSI entry set with KVM_SET_GSI_ROUTING (used by irqfd\nand KVM_IRQ_LINE) or directly via KVM_SIGNAL_MSI, and is never checked\nagainst EIOINTC_IRQS.\n\neiointc_set_irq() uses the value with __set_bit()/__clear_bit() on the\n256-bit isr bitmap, eiointc_update_irq() then indexes sw_coremap[] and\nthe per-cpu coreisr/sw_coreisr bitmaps with it. Therefore a data value\n>= 256 reads and writes memory past the end of those arrays, i.e. any\nprocess holding a VM fd can corrupt kernel memory beyond the allocation\nof loongarch_eiointc.\n\nReject MSI data that doesn't fit in the EIOINTC irq space. The DMSINTC\npath is unaffected as it decodes the vector from the address and masks\nit.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":205142,"id":"CVE-2026-89907","ts":1789570705441,"field":"cvss","old":null,"new":"8.8"},{"seq":205141,"id":"CVE-2026-89907","ts":1789570705441,"field":"severity","old":"none","new":"high"}]}