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Linux Kernel CVE-2026-43471

| EUVDEUVD-2026-28777 MEDIUM
NULL Pointer Dereference (CWE-476)
2026-05-08 Linux GHSA-w5m6-6h93-74m4
Linux Null Pointer Dereference Denial Of Service Red Hat 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
SUSE
MEDIUM
qualitative
Red Hat
5.5 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

4
Analysis Generated
May 20, 2026 - 18:40 vuln.today
CVSS changed
May 20, 2026 - 18:37 NVD
5.5 (MEDIUM)
Patch available
May 08, 2026 - 16:18 EUVD
CVE Published
May 08, 2026 - 14:22 nvd
UNKNOWN (no severity yet)

DescriptionCVE.org

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

scsi: ufs: core: Fix possible NULL pointer dereference in ufshcd_add_command_trace()

The kernel log indicates a crash in ufshcd_add_command_trace, due to a NULL pointer dereference when accessing hwq->id. This can happen if ufshcd_mcq_req_to_hwq() returns NULL.

This patch adds a NULL check for hwq before accessing its id field to prevent a kernel crash.

Kernel log excerpt: [<ffffffd5d192dc4c>] notify_die+0x4c/0x8c [<ffffffd5d1814e58>] __die+0x60/0xb0 [<ffffffd5d1814d64>] die+0x4c/0xe0 [<ffffffd5d181575c>] die_kernel_fault+0x74/0x88 [<ffffffd5d1864db4>] __do_kernel_fault+0x314/0x318 [<ffffffd5d2a3cdf8>] do_page_fault+0xa4/0x5f8 [<ffffffd5d2a3cd34>] do_translation_fault+0x34/0x54 [<ffffffd5d1864524>] do_mem_abort+0x50/0xa8 [<ffffffd5d2a297dc>] el1_abort+0x3c/0x64 [<ffffffd5d2a29718>] el1h_64_sync_handler+0x44/0xcc [<ffffffd5d181133c>] el1h_64_sync+0x80/0x88 [<ffffffd5d255c1dc>] ufshcd_add_command_trace+0x23c/0x320 [<ffffffd5d255bad8>] ufshcd_compl_one_cqe+0xa4/0x404 [<ffffffd5d2572968>] ufshcd_mcq_poll_cqe_lock+0xac/0x104 [<ffffffd5d11c7460>] ufs_mtk_mcq_intr+0x54/0x74 [ufs_mediatek_mod] [<ffffffd5d19ab92c>] __handle_irq_event_percpu+0xc8/0x348 [<ffffffd5d19abca8>] handle_irq_event+0x3c/0xa8 [<ffffffd5d19b1f0c>] handle_fasteoi_irq+0xf8/0x294 [<ffffffd5d19aa778>] generic_handle_domain_irq+0x54/0x80 [<ffffffd5d18102bc>] gic_handle_irq+0x1d4/0x330 [<ffffffd5d1838210>] call_on_irq_stack+0x44/0x68 [<ffffffd5d183af30>] do_interrupt_handler+0x78/0xd8 [<ffffffd5d2a29c00>] el1_interrupt+0x48/0xa8 [<ffffffd5d2a29ba8>] el1h_64_irq_handler+0x14/0x24 [<ffffffd5d18113c4>] el1h_64_irq+0x80/0x88 [<ffffffd5d2527fb4>] arch_local_irq_enable+0x4/0x1c [<ffffffd5d25282e4>] cpuidle_enter+0x34/0x54 [<ffffffd5d195a678>] do_idle+0x1dc/0x2f8 [<ffffffd5d195a7c4>] cpu_startup_entry+0x30/0x3c [<ffffffd5d18155c4>] secondary_start_kernel+0x134/0x1ac [<ffffffd5d18640bc>] __secondary_switched+0xc4/0xcc

AnalysisAI

NULL pointer dereference in the Linux kernel's UFS host controller driver crashes the kernel when ufshcd_mcq_req_to_hwq() returns NULL during MCQ command completion, allowing an authenticated local user on affected hardware to trigger a denial of service. The vulnerability is confined to the SCSI UFS subsystem's ufshcd_add_command_trace() function and impacts systems with UFS storage operating in Multi-Circular Queue mode - primarily ARM64 embedded and mobile platforms using MediaTek UFS controllers. No public exploit has been identified at time of analysis, and EPSS at 0.02% (5th percentile) reflects the highly constrained attack surface.

Technical ContextAI

The vulnerability (CWE-476, NULL Pointer Dereference) resides in the ufshcd_add_command_trace() function within the Linux kernel's SCSI UFS (Universal Flash Storage) host controller driver. During UFS command completion processing, ufshcd_mcq_req_to_hwq() can return NULL when resolving a hardware queue from an MCQ (Multi-Circular Queue) request - a UFS 3.x/4.x performance feature that uses multiple circular queues for parallel I/O dispatch. The code proceeds to dereference hwq->id without validating the pointer, triggering a kernel-level page fault. The crash occurs entirely within the IRQ completion path: ufs_mtk_mcq_intr → ufshcd_mcq_poll_cqe_lock → ufshcd_compl_one_cqe → ufshcd_add_command_trace, as confirmed by the AArch64 exception vectors (el1_abort, el1h_64_sync_handler) in the provided kernel log. CPE data (cpe:2.3:a:linux:linux:*:*:*:*:*:*:*:*) covers all kernel versions prior to the respective stable branch fixes. The fix is a single NULL guard on the hwq pointer before accessing hwq->id.

RemediationAI

Apply kernel updates to the patched stable releases: 6.6.130, 6.12.78, 6.18.19, 6.19.9, or 7.0 depending on the branch in use. Upstream fix commits are documented at https://git.kernel.org/stable/c/0614f5618c24fbc3d555efade22887b102ad7ad6 (6.12.x branch), https://git.kernel.org/stable/c/be730f9ee92ae08f2bc4b336967bcfd8183c06fe (6.18.x), https://git.kernel.org/stable/c/93b9e7ee9e93629db80bbc9dab8a874215b89ccf (6.19.x), https://git.kernel.org/stable/c/30df81f2228d65bddf492db3929d9fcaffd38fc5 (6.6.x LTS), and https://git.kernel.org/stable/c/f4f590c6c9df7453bbda2ef9170b1b09e42a124c (7.0). As a compensating control where immediate kernel upgrade is not feasible, disabling UFS MCQ mode via kernel boot parameters or module options (if exposed by the platform driver) eliminates the vulnerable code path at the cost of reduced UFS throughput and potentially higher interrupt latency on affected hardware. Restricting local shell access on UFS-MCQ-equipped systems reduces exposure until patching is completed.

Same weakness CWE-476 – NULL Pointer Dereference

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Same technique Null Pointer Dereference

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CVE-2016-0742 HIGH
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CVE-2014-3470 MEDIUM
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CVE-2017-3730 HIGH POC
7.5
CVE-2017-3169 CRITICAL POC
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CVE-2016-4957 HIGH
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CVE-2015-3194 HIGH
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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7 Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed

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CVE-2026-43471 vulnerability details – vuln.today
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