UBUNTU-CVE-2026-93185: Medium severity ubuntu/linux-hwe-edge vulnerability
In the Linux kernel, the following vulnerability has been resolved: ASoC: rt700-sdw: always drain jack work on remove rt700sdwremove() drains jackdetectwork and jackbtncheckwork only when rt700->hwinit is true. That state bit is cleared by rt700updatestatus() when the SoundWire slave becomes UNATTACHED, but a jack work item can already have been queued by rt700interruptcallback() or rt700jackinit() while the device was initialized. Do not use hwinit as the remove-time guard for draining these work objects. The delayed works are initialized during rt700init(), so remove can cancel them unconditionally and pair the object lifetime with the codec-private data lifetime instead of a mutable hardware state bit. This issue was found by our static analysis tool and then confirmed by manual review of the SoundWire status, interrupt and remove paths. The remove path should drain work based on whether the work object exists, not on a runtime hardware state bit that can change after the work was queued. A QEMU PoC queued jackdetectwork, simulated SDWSLAVEUNATTACHED, and then entered remove. DEBUGOBJECTS reported an active timer/work object associated with the rt700 jack work path after remove skipped the cancel. This is sent as an RFC because the practical trigger depends on SoundWire core remove ordering after an UNATTACHED status update. If remove cannot run after hwinit has been cleared while jack work is still pending, this is a defensive lifecycle cleanup rather than a reachable race on current systems.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
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ubuntu/linux-aws-5.15to a version that resolves this vulnerability.Fixed in 5.15.0-1119.126~20.04.1 - Upgrade
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ubuntu/linux-azure-5.15to a version that resolves this vulnerability.Fixed in 5.15.0-1125.134~20.04.1 - Upgrade
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ubuntu/linux-azure-fde-5.15to a version that resolves this vulnerability.Fixed in 5.15.0-1124.133~20.04.1 - Upgrade
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ubuntu/linux-gcp-5.15to a version that resolves this vulnerability.Fixed in 5.15.0-1120.130~20.04.1 - Upgrade
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ubuntu/linux-hwe-5.15to a version that resolves this vulnerability.Fixed in 5.15.0-202.212~20.04.1 - Upgrade
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ubuntu/linux-ibm-5.15to a version that resolves this vulnerability.Fixed in 5.15.0-1113.117~20.04.1 - Upgrade
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ubuntu/linux-lowlatency-hwe-5.15to a version that resolves this vulnerability.Fixed in 5.15.0-197.207~20.04.1 - Upgrade
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ubuntu/linux-oracle-5.15to a version that resolves this vulnerability.Fixed in 5.15.0-1116.122~20.04.1 - Upgrade
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ubuntu/linuxto a version that resolves this vulnerability.Fixed in 5.15.0-202.212 - Upgrade
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ubuntu/linux-gcpto a version that resolves this vulnerability.Fixed in 5.15.0-1120.130 - Upgrade
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ubuntu/linux-hwe-7.0to a version that resolves this vulnerability.Fixed in 7.0.0-42.42~24.04.1 - Upgrade
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ubuntu/linux-awsto a version that resolves this vulnerability.Fixed in 7.0.0-1016.17 - Upgrade
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ubuntu/linux-gcpto a version that resolves this vulnerability.Fixed in 7.0.0-1016.18 - Upgrade
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ubuntu/linux-riscvto a version that resolves this vulnerability.Fixed in 7.0.0-42.42.1 - Compensating control
In the Linux kernel ASoC rt700-sdw remove path, unconditionally drain/cancel the delayed works jack_detect_work and jack_btn_check_work when their work objects exist; do not guard this cleanup with the mutable hw_init state bit.
Event History
Frequently Asked Questions
Which systems are exposed to this issue?
Systems using an affected Ubuntu kernel package and the rt700-sdw ASoC SoundWire codec driver are relevant. The listed Ubuntu kernel package families are linux, linux-realtime, linux-azure, linux-gcp, linux-azure-fde, linux-gke, linux-riscv, and linux-gkeop.
What condition is required to trigger the faulty remove path?
A jack-related delayed work item must have been queued while the device was initialized, after which the SoundWire slave becomes UNATTACHED and the driver enters its remove path. The problem arises because the hw_init state can be cleared before removal, causing queued jack work not to be drained.
How can an affected system be identified?
The described reproduction queues jack_detect_work, simulates SDW_SLAVE_UNATTACHED, and then removes the device. With DEBUG_OBJECTS enabled, the issue can appear as a report of an active timer or work object associated with rt700 jack work during removal.
What does the fix change?
The fix cancels and drains the jack delayed-work objects unconditionally during removal rather than using the mutable hw_init hardware-state flag as a guard. This ties work-object cleanup to the lifetime of the codec-private data.