Medium 5.5Published Jul 19, 2026

CVE-2026-64052block: bio-integrity: Fix null-ptr-deref in bio_integrity_map_user()

Updated under an hour ago (Oct 26, 2026, 12:50 PM ET)

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Exploited in the last 30 days

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

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: Jul 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	492c5d455969fc2e829f26ed4c83487b068f0dd7 builds before 77c059f41e9395793917d067476f549a911d77d3; from 492c5d455969fc2e829f26ed4c83487b068f0dd7 before 76410790f1491c8e06a451045ae223a61c652455; 492c5d455969fc2e829f26ed4c83487b068f0dd7 builds before 8fa244738641d95ea4d70e6f9a62778bba42a5b7; from 492c5d455969fc2e829f26ed4c83487b068f0dd7 before 8582792cf23b3d94674d4d838f7cde9a28d0fcaf	CNA record
linux linux_kernel linux:linux_kernel	from 6.8 before 6.12.92; from 6.13 before 6.18.34; from 6.19 before 7.0.11; 7.1; 7.1; 7.1	NVD

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.