CVE-2026-64052

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

block: bio-integrity: Fix null-ptr-deref in biointegritymap_user()

pinuserpagesfast() can partially succeed and return the number of pages that were actually pinned. However, the biointegritymapuser() does not handle this partial pinning. This leads to a general protection fault since bvecfrompages() dereferences an unpinned page address, which is 0.

To fix this, add a check to verify that all requested memory is pinned. If partial pinning occurs, unpin the memory and return -EFAULT.

Kernel Oops:

Oops: general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 0 UID: 0 PID: 1061 Comm: nvme-passthroug Not tainted 7.0.0-11783-g90957f9314e8-dirty #16 PREEMPT(lazy) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.17.0-0-gb52ca86e094d-prebuilt.qemu.org 04/01/2014 RIP: 0010:biointegritymap_user.cold+0x1b0/0x9d6