Race condition in Linux kernel espintcp_close()
CVE-2026-23239 is a Linux kernel race condition in the espintcp component, specifically in espintcp_close(). After espintcp_close() calls cancel_work_sync(&ctx->work), the espintcp_tx_work() worker can still be scheduled from other execution paths, including the Delayed ACK handler and ksoftirqd. This creates a window where queued work executes after teardown has progressed, causing espintcp_tx_work() to dereference a freed espintcp context (ctx) or socket structure (sk). The upstream fix replaces cancel_work_sync() with disable_work_sync() to prevent the work item from being rescheduled during close, eliminating the use-after-free condition caused by the race.
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Cross-references every affected SKU, including bundled OEM variants.
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