CVE-2026-64247

In the Linux kernel, the following vulnerability has been resolved:

KVM: x86: hyper-v: Bound the bank index when querying sparse banks

When checking if a VP ID is included in a sparse bank set, explicitly check that the ID can actually be contained in a sparse bank (the TLFS allows for a maximum of 64 banks of 64 vCPUs each). When handling a paravirtual TLB flush for L2, the VP ID is copied verbatim from the enlightened VMCS, without any bounds check, i.e. isn't guaranteed to be under the limit of 4096.

Failure to check the bounds of the VP ID leads to an out-of-bounds read when testing the sparse bank, and super strictly speaking could lead to KVM performing an unnecessary TLB flush for an L2 vCPU.

================================================================== BUG: KASAN: use-after-free in hvisvpinsparseset+0x85/0x100 [kvm] Read of size 8 at addr ffff88811ba5f598 by task hypervevmcs/2802

CPU: 12 UID: 1000 PID: 2802 Comm: hypervevmcs Not tainted 7.1.0-rc2 #7 PREEMPT Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015 Call Trace: <TASK> dumpstacklvl+0x51/0x60 printreport+0xcb/0x5d0 kasanreport+0xb4/0xe0 kasancheckrange+0x35/0x1b0 hvisvpinsparseset+0x85/0x100 [kvm] kvmhvflushtlb+0xe9e/0x16c0 [kvm] kvmhvhypercall+0xe6b/0x1e60 [kvm] vmxhandleexit+0x485/0x1b60 [kvmintel] kvmarchvcpuioctlrun+0x22e3/0x5070 [kvm] kvmvcpuioctl+0x5d0/0x10c0 [kvm] __x64sysioctl+0x129/0x1a0 dosyscall64+0xb9/0xcf0 entrySYSCALL64afterhwframe+0x4b/0x53 RIP: 0033:0x7f0e62d1a9bf </TASK>

The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffffffffffffffff pfn:0x11ba5f flags: 0x4000000000000000(zone=1) raw: 4000000000000000 0000000000000000 00000000ffffffff 0000000000000000 raw: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected

Memory state around the buggy address: ffff88811ba5f480: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88811ba5f500: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff

ffff88811ba5f580: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88811ba5f600: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88811ba5f680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== Disabling lock debugging due to kernel taint

Opportunistically add a compile time assertion to ensure the maximum number of sparse banks exactly matches the number of possible bits in the passed in mask.

[sean: add KASAN splat, drop comment, add assert, massage changelog]