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Linux Kernel CVE-2026-64052

| EUVDEUVD-2026-45625 MEDIUM
NULL Pointer Dereference (CWE-476)
2026-07-19 Linux GHSA-f89w-gg6r-rvww
Denial Of Service Linux Null Pointer Dereference Red Hat Canonical Suse
5.5
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
5.5 MEDIUM

Local access with low privileges required to reach NVMe passthrough path; kernel crash is the sole impact with no confidentiality or integrity effect.

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
MEDIUM
qualitative
Red Hat
5.5 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

5
Analysis Generated
Sep 02, 2026 - 23:31 vuln.today
CVSS changed
Sep 02, 2026 - 21:22 NVD
5.5 (MEDIUM)
Patch available
Jul 19, 2026 - 17:03 EUVD
CVE Published
Jul 19, 2026 - 15:39 cve.org
UNKNOWN (no severity yet)
CVE Published
Jul 19, 2026 - 15:39 nvd
MEDIUM 5.5

DescriptionNVD

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

AnalysisAI

Null pointer dereference in the Linux kernel's block bio-integrity subsystem (bio_integrity_map_user()) allows a local low-privileged attacker to crash the kernel, causing a denial of service. The flaw stems from pin_user_pages_fast() being permitted to return a partial page-pin result that is never validated before bvec_from_pages() dereferences the uninitialized zero-address entry. Patches are available across multiple stable kernel branches and Ubuntu has issued USN-8593-1; no active exploitation has been identified (EPSS 0.17%, no CISA KEV listing).

Technical ContextAI

The Linux kernel's block layer exposes a data-integrity framework (bio-integrity) that allows user-space callers - notably NVMe passthrough via ioctl - to attach per-I/O integrity metadata backed by user-space memory pages. bio_integrity_map_user() calls pin_user_pages_fast() to pin those pages into kernel-visible memory before constructing bio vectors via bvec_from_pages(). The POSIX guarantee for pin_user_pages_fast() allows it to return a count smaller than the requested number of pages (partial success). The vulnerable code path (CWE-476: Null Pointer Dereference) did not validate the returned count against the requested count, so bvec_from_pages() would index into uninitialized slots backed by page address 0x0. KASAN reports this as a null-ptr-deref in the range 0x0000000000000008-0x000000000000000f, consistent with a struct field access on a null page pointer. The bug was introduced at commit 492c5d455969fc2e829f26ed4c83487b068f0dd7 and affects Linux 6.8 and later lines up to the fix commits. The affected CPE is cpe:2.3:a:linux:linux:*.

RemediationAI

The primary fix is to upgrade to a patched kernel: Linux 7.1 or 7.0.11 for the 7.x series, 6.18.34 for the 6.18.x series, and 6.12.92 for the 6.12.x series. Ubuntu users should apply the security update from USN-8593-1 (https://ubuntu.com/security/notices/USN-8593-1). For systems that cannot be patched immediately, restrict access to NVMe character devices (e.g., /dev/ng*) to the root user or a dedicated storage-admin group via filesystem permissions (chmod 600, chown root); this prevents unprivileged users from reaching the vulnerable bio_integrity_map_user() code path without affecting normal block I/O operations. Alternatively, SELinux or AppArmor policies can be used to confine NVMe ioctl access. Note that these workarounds do not protect root-accessible paths, so patching remains the definitive fix.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
Container suse/sl-micro/6.0/base-os-container:2.1.3-7.208 Container suse/sl-micro/6.1/base-os-container:2.2.1-5.184 Affected
Container suse/sl-micro/6.0/kvm-os-container:2.1.3-6.218 Container suse/sl-micro/6.1/kvm-os-container:2.2.1-5.186 Affected
Container suse/sl-micro/6.0/rt-os-container:2.1.3-7.237 Container suse/sl-micro/6.1/rt-os-container:2.2.1-5.180 Affected
SUSE Linux Enterprise Real Time 15 SP7 SUSE Real Time Module 15 SP7 Fixed
SUSE Linux Micro 6.0 Fixed

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CVE-2026-64052 vulnerability details – vuln.today
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