CVE-2026-89513

In the Linux kernel, the following vulnerability has been resolved: RISC-V: KVM: Fix PMU event info array size overflow SBI PMU EVENT_GET_INFO stores guest-controlled num_events * sizeof(*einfo) in a 32-bit integer. On RV64, num_events = 0x10000001 makes 0x100000010 truncate to 16. KVM then allocates one entry but loops over the original num_events, causing out-of-bounds reads and writes. A nested guest triggered: BUG: KASAN: slab-out-of-bounds in kvm_riscv_vcpu_pmu_event_info+0xa4/0x142 Read of size 4 at addr ff600000074d46b0 by task init/1 Call Trace: [<ffffffff8006471c>] kvm_riscv_vcpu_pmu_event_info+0xa4/0x142 [<ffffffff800690c0>] kvm_sbi_ext_pmu_handler+0xca/0x268 [<ffffffff8006779e>] kvm_riscv_vcpu_sbi_ecall+0xec/0x1e6 [<ffffffff8006008c>] kvm_riscv_vcpu_exit+0x48c/0x540 [<ffffffff8005ea0a>] kvm_arch_vcpu_ioctl_run+0x37e/0xc80 Allocated by task 1: __kmalloc_noprof+0x19e/0x4b0 kvm_riscv_vcpu_pmu_event_info+0x72/0x142 kvm_sbi_ext_pmu_handler+0xca/0x268 kvm_riscv_vcpu_sbi_ecall+0xec/0x1e6 kvm_riscv_vcpu_exit+0x48c/0x540 kvm_arch_vcpu_ioctl_run+0x37e/0xc80 The buggy address is located 0 bytes to the right of allocated 16-byte region [ff600000074d46a0, ff600000074d46b0) Store the shared-memory size in size_t and reject multiplication overflow. Allocate the guest-driven array with GFP_KERNEL_ACCOUNT so it is charged to kmemcg, and use __GFP_NOWARN to suppress allocation failure warnings. Use kvcalloc() to allow vmalloc fallback and an unsigned long loop index to match num_events.

• https://git.kernel.org/stable/c/735bc20c24187ca419c9d5e63860a54b91be34bd
• https://git.kernel.org/stable/c/82088f88c96b99c27a974d09b02c2b133262fadf

Published

Sep 11, 2026

Last Modified

Sep 13, 2026

Status

Received

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-89508In the Linux kernel, the following vulnerability has been re…7.8
• CVE-2026-89509In the Linux kernel, the following vulnerability has been re…
• CVE-2026-8951Spoofing issue in the Toolbar component in Firefox for Andro…6.5
• CVE-2026-89510In the Linux kernel, the following vulnerability has been re…7.8
• CVE-2026-89511In the Linux kernel, the following vulnerability has been re…7.5
• CVE-2026-89512In the Linux kernel, the following vulnerability has been re…
• CVE-2026-89514In the Linux kernel, the following vulnerability has been re…
• CVE-2026-89515In the Linux kernel, the following vulnerability has been re…
• CVE-2026-89516In the Linux kernel, the following vulnerability has been re…
• CVE-2026-89517In the Linux kernel, the following vulnerability has been re…
• CVE-2026-89518In the Linux kernel, the following vulnerability has been re…
• CVE-2026-89519In the Linux kernel, the following vulnerability has been re…