CVE-2026-98465
Description
In the Linux kernel, the following vulnerability has been resolved: RISC-V: KVM: Serialize IMSIC attributes with vCPU migration KVM device ioctls are not serialized against KVM_RUN. As a result, kvm_riscv_aia_imsic_rw_attr() can snapshot the physical CPU and HGEI of an IMSIC VS-file before a concurrent vCPU migration releases it. The HGEI can then be allocated to another vCPU before imsic_vsfile_rw() uses the stale tuple. A GET or SET attribute may consequently access the new owner's interrupt file. Serialize the entire IMSIC attribute operation with the target vCPU mutex. This prevents the VS-file from being migrated and recycled until the attribute access completes. Acquire the mutex killably so that the device ioctl remains interruptible while waiting for KVM_RUN to finish.
How to fix
- Linux Linux6c2bcf6b173d4afed883cceea9d47f2c5194161d, a29c5d2dd2ef9a8617a9a6d5585696d5f149cd98, c525772c304c971b0d3a1f2898dedbae653efe90, 71acbea44e78665ea90e3c310fca6bbdcc0252db, 8ae12ccaec6ec74945d8c1ef39f2c1b8df779abc or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | db8b7e97d6137a28b2bfc07e591d54da268f0c36 ≤ v < 6c2bcf6b173d4afed883cceea9d47f2c5194161d, db8b7e97d6137a28b2bfc07e591d54da268f0c36 ≤ v < a29c5d2dd2ef9a8617a9a6d5585696d5f149cd98, db8b7e97d6137a28b2bfc07e591d54da268f0c36 ≤ v < c525772c304c971b0d3a1f2898dedbae653efe90, db8b7e97d6137a28b2bfc07e591d54da268f0c36 ≤ v < 71acbea44e78665ea90e3c310fca6bbdcc0252db, db8b7e97d6137a28b2bfc07e591d54da268f0c36 ≤ v < 8ae12ccaec6ec74945d8c1ef39f2c1b8df779abc, 6.5 | 6c2bcf6b173d4afed883cceea9d47f2c5194161d, a29c5d2dd2ef9a8617a9a6d5585696d5f149cd98, c525772c304c971b0d3a1f2898dedbae653efe90, 71acbea44e78665ea90e3c310fca6bbdcc0252db, 8ae12ccaec6ec74945d8c1ef39f2c1b8df779abc |
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