usb: typec: ucsi: Fix race condition and ordering in port unregistration

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74441
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 13:17:48 UTC
Updated2026-08-15 13:17:48 UTC
DescriptionIn 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().

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected b9aa02ca39a49740926c2c450a1505a4a0f8954a 07f8aaffee705e552c1f723ac8bf7eb137ad59c2 git Not specified
CNA Linux Linux affected b9aa02ca39a49740926c2c450a1505a4a0f8954a 11483d80267db97fbe49f2df66385434256cc3b0 git Not specified
CNA Linux Linux affected b9aa02ca39a49740926c2c450a1505a4a0f8954a 3f7b3728dd9011c915cbeaea77274ebe8366550d git Not specified
CNA Linux Linux affected b9aa02ca39a49740926c2c450a1505a4a0f8954a bc7a0f721123ea260a42f1ded06dab844ba49434 git Not specified
CNA Linux Linux affected b9aa02ca39a49740926c2c450a1505a4a0f8954a 7aa7d4bf9d3fa9a6a47b640ad103ab433b7ff261 git Not specified
CNA Linux Linux affected 5.16 Not specified
CNA Linux Linux unaffected 5.16 semver Not specified
CNA Linux Linux unaffected 6.6.151 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.103 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.44 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.8 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc5 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/07f8aaffee705e552c1f723ac8bf7eb137ad59c2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7aa7d4bf9d3fa9a6a47b640ad103ab433b7ff261 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bc7a0f721123ea260a42f1ded06dab844ba49434 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3f7b3728dd9011c915cbeaea77274ebe8366550d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/11483d80267db97fbe49f2df66385434256cc3b0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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