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CVE-2026-23454

net: mana: fix use-after-free in mana_hwc_destroy_channel() by reordering teardown

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.15.203, 6.1.167, 6.6.130, 6.12.78, 6.18.20, and 1 more
None on Exploit-DB, Metasploit or GitHub

Summary

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.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f · fixed in b88edf12fc3779521ae5f6f1584153b15f7da6df; From ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f · fixed in e23bf444512cb85d76012080a76cd1f9e967448e; From ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f · fixed in 249e905571583a434d4ea8d6f92ccc0eef337115; From ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f · fixed in 2b001901f689021acd7bf2dceed74a1bdcaaa1f9; From ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f · fixed in afdb1533eb9c05432aeb793a7280fa827c502f5c; From ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f · fixed in 05d345719d85b927cba74afac4d5322de3aa4256; From ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f · fixed in fa103fc8f56954a60699a29215cb713448a39e87

  • Linux Linux

    5.13

  • KernelLinux

    From 5.13.0 · fixed in 5.15.203; From 5.16.0 · fixed in 6.1.167; From 6.2.0 · fixed in 6.6.130; From 6.7.0 · fixed in 6.12.78; From 6.13.0 · fixed in 6.18.20; From 6.19.0 · fixed in 6.19.10

References 7

git.kernel.org