CVE-2026-64052

In the Linux kernel, the following vulnerability has been resolved: block: bio-integrity: Fix null-ptr-deref in bio_integrity_map_user() pin_user_pages_fast() can partially succeed and return the number of pages that were actually pinned. However, the bio_integrity_map_user() does not handle this partial pinning. This leads to a general protection fault since bvec_from_pages() 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:bio_integrity_map_user.cold+0x1b0/0x9d6

• https://git.kernel.org/stable/c/76410790f1491c8e06a451045ae223a61c652455
• https://git.kernel.org/stable/c/77c059f41e9395793917d067476f549a911d77d3
• https://git.kernel.org/stable/c/8582792cf23b3d94674d4d838f7cde9a28d0fcaf
• https://git.kernel.org/stable/c/8fa244738641d95ea4d70e6f9a62778bba42a5b7

Published

Jul 19, 2026

Last Modified

Jul 30, 2026

Status

Awaiting Analysis

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