CVE-2026-43275

Description

In the Linux kernel, the following vulnerability has been resolved: scsi: ufs: core: Flush exception handling work when RPM level is zero Ensure that the exception event handling work is explicitly flushed during suspend when the runtime power management level is set to UFS_PM_LVL_0. When the RPM level is zero, the device power mode and link state both remain active. Previously, the UFS core driver bypassed flushing exception event handling jobs in this configuration. This created a race condition where the driver could attempt to access the host controller to handle an exception after the system had already entered a deep power-down state, resulting in a system crash. Explicitly flush this work and disable auto BKOPs before the suspend callback proceeds. This guarantees that pending exception tasks complete and prevents illegal hardware access during the power-down sequence.

CVSS Details

CVSS Score

4.7

Severity

MEDIUM

CVSS Vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Configurations (Affected Products)

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* - VULNERABLE

Linux Kernel < Commit 5d186731bc335cc049d4e57ab9f563cfab95593e

Linux Kernel < Commit 78d8e2d6352e8317686ee3a44811ac14c415a57d

Linux Kernel < Commit aa8d68d97c7f0ef966e51afc17fdbdc372700edf

Linux Kernel < Commit aac2fee7513dd25042a616f86a1469b4858d2c5c

Linux Kernel < Commit ab71c146c135f9af1614ef0fc29a0a3b84f1a373

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

/*
 * Conceptual Proof of Concept for CVE-2026-43275
 * This demonstrates the logic to trigger the race condition.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/device.h>

static int __init trigger_ufs_race_init(void) {
    // Step 1: Simulate setting RPM level to 0 (UFS_PM_LVL_0)
    // In a real scenario, this involves runtime_pm APIs.
    printk(KERN_INFO "CVE-2026-43275: Setting RPM level to 0");

    // Step 2: Trigger an exception event (e.g., UFS device error)
    // This queues work to the exception handling workqueue.
    printk(KERN_INFO "CVE-2026-43275: Triggering UFS exception event");

    // Step 3: Initiate system suspend immediately
    // If the patch is not applied, the exception handling work
    // will not be flushed, leading to a crash upon hardware access.
    printk(KERN_INFO "CVE-2026-43275: Initiating suspend sequence");

    return 0;
}

static void __exit trigger_ufs_race_exit(void) {
    printk(KERN_INFO "CVE-2026-43275: Unloading module");
}

module_init(trigger_ufs_race_init);
module_exit(trigger_ufs_race_exit);
MODULE_LICENSE("GPL");

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-43275
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-43275
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-43275/
[4] VulDB https://vuldb.com/cve/CVE-2026-43275
[5] https://git.kernel.org/stable/c/5d186731bc335cc049d4e57ab9f563cfab95593e
[6] https://git.kernel.org/stable/c/78d8e2d6352e8317686ee3a44811ac14c415a57d
[7] https://git.kernel.org/stable/c/aa8d68d97c7f0ef966e51afc17fdbdc372700edf
[8] https://git.kernel.org/stable/c/aac2fee7513dd25042a616f86a1469b4858d2c5c
[9] https://git.kernel.org/stable/c/ab71c146c135f9af1614ef0fc29a0a3b84f1a373
[10] https://git.kernel.org/stable/c/d5c3a1a13f97355c397f9439d79cb04b182958a3
[11] https://git.kernel.org/stable/c/f8ef441811ec413717f188f63d99182f30f0f08e

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-43275", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-05-06T12:16:48.800", "lastModified": "2026-05-08T19:30:22.640", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: ufs: core: Flush exception handling work when RPM level is zero\n\nEnsure that the exception event handling work is explicitly flushed during\nsuspend when the runtime power management level is set to UFS_PM_LVL_0.\n\nWhen the RPM level is zero, the device power mode and link state both\nremain active. Previously, the UFS core driver bypassed flushing exception\nevent handling jobs in this configuration. This created a race condition\nwhere the driver could attempt to access the host controller to handle an\nexception after the system had already entered a deep power-down state,\nresulting in a system crash.\n\nExplicitly flush this work and disable auto BKOPs before the suspend\ncallback proceeds. This guarantees that pending exception tasks complete\nand prevents illegal hardware access during the power-down sequence."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseScore": 4.7, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "HIGH", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.0, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-362"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "5.15.202", "matchCriteriaId": "B0911717-6197-4D52-8E5A-CF01589FC143"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.1.165", "matchCriteriaId": "797C7F46-D0BE-4FB8-A502-C5EF8E6B6654"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.6.128", "matchCriteriaId": "851E9353-6C09-4CC9-877E-E09DB164A3C2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.12.75", "matchCriteriaId": "BCE16369-98ED-41CF-8995-DFDC10B288D2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.16", "matchCriteriaId": "B4B8CDA9-BADF-4CF5-8B3B-702DE8EEA40B"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "6.19.6", "matchCriteriaId": "373EEEDA-FAA1-4FB4-B6ED-DB4DD99DBE67"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/5d186731bc335cc049d4e57ab9f563cfab95593e", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/78d8e2d6352e8317686ee3a44811ac14c415a57d", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/aa8d68d97c7f0ef966e51afc17fdbdc372700edf", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/aac2fee7513dd25042a616f86a1469b4858d2c5c", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/ab71c146c135f9af1614ef0fc29a0a3b84f1a373", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/d5c3a1a13f97355c397f9439d79cb04b182958a3", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/f8ef441811ec413717f188f63d99182f30f0f08e", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}