In the Linux kernel, the following vulnerability has been resolved: net: mana: fix use-after-free in mana_hwc_destroy_channel() by reordering teardown A potential race condition exists in mana_hwc_destroy_channel() where hwc->caller_ctx is freed before the HWC's Completion Queue (CQ) and Event Queue (EQ) are destroyed. This allows an in-flight CQ interrupt handler to dereference freed memory, leading to a use-after-free or NULL pointer dereference in mana_hwc_handle_resp(). mana_smc_teardown_hwc() signals the hardware to stop but does not synchronize against IRQ handlers already executing on other CPUs. The IRQ synchronization only happens in mana_hwc_destroy_cq() via mana_gd_destroy_eq() -> mana_gd_deregister_irq(). Since this runs after kfree(hwc->caller_ctx), a concurrent mana_hwc_rx_event_handler() can dereference freed caller_ctx (and rxq->msg_buf) in mana_hwc_handle_resp(). Fix this by reordering teardown to reverse-of-creation order: destroy the TX/RX work queues and CQ/EQ before freeing hwc->caller_ctx. This ensures all in-flight interrupt handlers complete before the memory they access is freed.
| Vendor | Product | Versions |
|---|---|---|
| linux | linux kernel | ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f, ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f, ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f, ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f, ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f, ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f, 5.13, 6.1.167, 6.6.130, 6.12.78, 6.18.20, 6.19.10, 7.0-rc5 |
Updated severity to CRITICAL, added CWE-476, and included new CVE ID CVE-2026-23454.
Updated description with more technical detail, added affected versions, changed severity to HIGH, and marked exploit availability and active exploitation as true.
Initial creation
