Local service interruption via XDMA stop-request race
Published Jul 12, 2024 · Updated Aug 5, 2026
Race condition in the XDMA channel interrupt handler in Linux 6.8.9 through 6.9.6 allows local users to interrupt DMA-backed services. The handler reads xchan->stop_requested before taking vchan.lock, while transfer teardown writes that flag under the lock, so an interrupt can miss the completion signal. Reachability requires Xilinx XDMA hardware and local access to an ALSA or V4L2 device path that can stop a transfer; the bounded consequence is stalled teardown and service interruption.
Summary
What happened
Race condition in the XDMA channel interrupt handler in Linux 6.8.9 through 6.9.6 allows local users to interrupt DMA-backed services. The handler reads xchan->stop_requested before taking vchan.lock, while transfer teardown writes that flag under the lock, so an interrupt can miss the completion signal. Reachability requires Xilinx XDMA hardware and local access to an ALSA or V4L2 device path that can stop a transfer; the bounded consequence is stalled teardown and service interruption.
The record
- CVE
- CVE-2024-40986
- Published
- Jul 12, 2024
- Updated
- Aug 5, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- T1499
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 12, 2024CVE publishedPublication date reported by the CVE source.
- Aug 5, 2026Record updatedLatest update available in the CVE record.
Exploitability
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- Affected versionversion=582ce5d734190d74e5ce9cd711cf6e964e1e7b29
- Affected versionversion=6.8.9 <6.9
- Affected versionversion=6.9
- Affected versionversion=6a40fb8245965b481b4dcce011cd63f20bf91ee0 <462237d2d93fc9e9221d1cf9f773954d27da83c0
- Affected versionversion=6a40fb8245965b481b4dcce011cd63f20bf91ee0 <8e1f54e4a3f3207c9dc68bb5000603b75802e7f0
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Attacks
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