Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f before b88edf12fc3779521ae5f6f1584153b15f7da6df; affected ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f before e23bf444512cb85d76012080a76cd1f9e967448e; affected ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f before 249e905571583a434d4ea8d6f92ccc0eef337115; affected ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f before 2b001901f689021acd7bf2dceed74a1bdcaaa1f9; affected ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f before afdb1533eb9c05432aeb793a7280fa827c502f5c; affected ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f before 05d345719d85b927cba74afac4d5322de3aa4256; affected ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f before fa103fc8f56954a60699a29215cb713448a39e87 |
| Linux / Linux | affected 5.13; unaffected 0 before 5.13; unaffected 5.15.203 through 5.15.*; unaffected 6.1.167 through 6.1.*; unaffected 6.6.130 through 6.6.*; unaffected 6.12.78 through 6.12.*; unaffected 6.18.20 through 6.18.*; unaffected 6.19.10 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/b88edf12fc3779521ae5f6f1584153b15f7da6df
- https://git.kernel.org/stable/c/e23bf444512cb85d76012080a76cd1f9e967448e
- https://git.kernel.org/stable/c/249e905571583a434d4ea8d6f92ccc0eef337115
- https://git.kernel.org/stable/c/2b001901f689021acd7bf2dceed74a1bdcaaa1f9
- https://git.kernel.org/stable/c/afdb1533eb9c05432aeb793a7280fa827c502f5c
- https://git.kernel.org/stable/c/05d345719d85b927cba74afac4d5322de3aa4256
- https://git.kernel.org/stable/c/fa103fc8f56954a60699a29215cb713448a39e87
ADP enrichment
No English description supplied.