Host kernel corruption via unchecked irqchip index
Published Aug 15, 2026 · Updated Aug 15, 2026
An out-of-bounds write in Linux LoongArch KVM irqfd routing allows local users to corrupt host kernel memory through /dev/kvm ioctls. The kvm_set_routing_entry function uses an attacker-controlled irqchip value to index rt->chip before checking its range, so a crafted KVM_SET_GSI_ROUTING request writes beyond the chip array. Access to /dev/kvm and a LoongArch KVM host are required; corruption can disclose or alter host memory, escalate privileges, or panic the host.
Summary
What happened
An out-of-bounds write in Linux LoongArch KVM irqfd routing allows local users to corrupt host kernel memory through /dev/kvm ioctls. The kvm_set_routing_entry function uses an attacker-controlled irqchip value to index rt->chip before checking its range, so a crafted KVM_SET_GSI_ROUTING request writes beyond the chip array. Access to /dev/kvm and a LoongArch KVM host are required; corruption can disclose or alter host memory, escalate privileges, or panic the host.
The record
- CVE
- CVE-2026-72295
- Published
- Aug 15, 2026
- Updated
- Aug 15, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-823, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 15, 2026CVE publishedPublication date reported by the CVE source.
- Aug 15, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=1928254c5ccb7bdffd7f0334e1ce250e9ce4de94 <199b570d7fca1aa70e596f10a6276997becffb6d
- Affected versionversion=1928254c5ccb7bdffd7f0334e1ce250e9ce4de94 <3474037904c20ff915e3ebab0ab5c1e41bbe549e
- Affected versionversion=1928254c5ccb7bdffd7f0334e1ce250e9ce4de94 <8b3e188d19e4ffe916780aeb7ddad9d6457b8bcc
- Affected versionversion=6.13
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo