Linux Kernel up to 7.2-rc4 usb ucsi_unregister_port use after free

CVSS Meta Temp Score
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CTI Interest Score
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8.4$0-$5k0.94+

Summaryinfo

A vulnerability described as very critical has been identified in Linux Kernel up to 6.6.150/6.12.102/6.18.43/7.1.7/7.2-rc4. Impacted is the function ucsi_unregister_port of the component usb. The manipulation results in use after free. This vulnerability is known as CVE-2026-74441. Attacking locally is a requirement. No exploit is available.

Detailsinfo

A vulnerability classified as very critical has been found in Linux Kernel up to 6.6.150/6.12.102/6.18.43/7.1.7/7.2-rc4. Affected is the function ucsi_unregister_port of the component usb. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: usb: typec: ucsi: Fix race condition and ordering in port unregistration A synchronization issue exists during port unregistration where pending partner work items can race against workqueue destruction, leading to use-after-free conditions: cros_ec_ucsi cros_ec_ucsi.3.auto: error -ETIMEDOUT: PPM init failed BUG: kernel NULL pointer dereference, address: 0000000000000000 RIP: 0010:__queue_work+0x83/0x4a0 Call Trace: <IRQ> __cfi_delayed_work_timer_fn+0x10/0x10 run_timer_softirq+0x3b6/0xbd0 sched_clock_cpu+0xc/0x110 irq_exit_rcu+0x18d/0x330 fred_sysvec_apic_timer_interrupt+0x5e/0x80 Fix this by ensuring strict ordering and proper serialization during teardown: 1. Move ucsi_unregister_partner() to the beginning of the teardown sequence and protect it under the connector mutex lock. 2. Ensure all pending partner tasks are explicitly flushed and finished before the workqueue is destroyed. 3. Switch from mod_delayed_work() to a cancel_delayed_work() and queue_delayed_work() sequence. This guarantees that items currently marked as pending won't be scheduled an additional time, preventing a double release of resources which leads to the following crash: Oops: general protection fault, probably for non-canonical address 0xdead000000000122: 0000 [#1] SMP NOPTI Workqueue: cros_ec_ucsi.3.auto-con2 ucsi_poll_worker RIP: 0010:ucsi_poll_worker+0x65/0x1e0 Call Trace: <TASK> process_scheduled_works+0x218/0x6d0 worker_thread+0x188/0x3f0 __cfi_worker_thread+0x10/0x10 kthread+0x226/0x2a0 To ensure these rules are applied identically across both the normal teardown and the ucsi_init() error paths, consolidate the cleanup logic into a new helper, ucsi_unregister_port().

The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2026-74441 since 08/15/2026. The exploitability is told to be easy. The attack needs to be approached locally. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/15/2026).

Upgrading to version 6.6.151, 6.12.103, 6.18.44, 7.1.8 or 7.2-rc5 eliminates this vulnerability. Applying the patch 07f8aaffee705e552c1f723ac8bf7eb137ad59c2/11483d80267db97fbe49f2df66385434256cc3b0/3f7b3728dd9011c915cbeaea77274ebe8366550d/bc7a0f721123ea260a42f1ded06dab844ba49434/7aa7d4bf9d3fa9a6a47b640ad103ab433b7ff261 is able to eliminate this problem.

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Productinfo

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Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.8
VulDB Meta Temp Score: 8.4

VulDB Base Score: 8.8
VulDB Temp Score: 8.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.6.151/6.12.103/6.18.44/7.1.8/7.2-rc5
Patch: 07f8aaffee705e552c1f723ac8bf7eb137ad59c2/11483d80267db97fbe49f2df66385434256cc3b0/3f7b3728dd9011c915cbeaea77274ebe8366550d/bc7a0f721123ea260a42f1ded06dab844ba49434/7aa7d4bf9d3fa9a6a47b640ad103ab433b7ff261

Timelineinfo

08/15/2026 Advisory disclosed
08/15/2026 +0 days CVE reserved
08/15/2026 +0 days VulDB entry created
08/15/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-74441 (🔒)
GCVE (CVE): GCVE-0-2026-74441
GCVE (VulDB): GCVE-100-390780

Entryinfo

Created: 08/15/2026 15:01
Changes: 08/15/2026 15:01 (59)
Complete: 🔍
Cache ID: 216::103

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