Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: net: mana: Fix TOCTOU double-fetch of hwc_msg_id from DMA buffer In mana_hwc_rx_event_handler(), resp->response.hwc_msg_id is read from DMA-coherent memory and bounds-checked, then mana_hwc_handle_resp() re-reads the same field from the same DMA buffer for test_bit() and pointer arithmetic. DMA-coherent memory is mapped uncacheable on x86 and is shared, unencrypted, in Confidential VMs (SEV-SNP/TDX), so each load goes directly to host-visible memory. A H/W can modify the value between the check and the use, bypassing the bounds validation. Fix this by reading hwc_msg_id exactly once using READ_ONCE() into a stack-local variable in mana_hwc_rx_event_handler(), and passing the validated value as a parameter to mana_hwc_handle_resp().
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f before a201c66edf2ebc6cfdc3813a889ba20fecebfae3; affected ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f before 70ad2dff8d052a85dfef15715b531f38a29108cf; affected ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f before 566f42fb67a7ebfed6650e407e5b72e6b3e83bf7; affected ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f before 6180a06bbc99fd9114b8db4be6c4d46e40f046ef; affected ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f before 09ec063d87c2dd3fa6f3561361a017bd882e9f37; affected ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f before 3c4db56ccd13dd020fbf43afabaee74a40ec75e4; affected ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f before 35f0f0a2536a4d604b4dbad92c85c4a8fdebb870 |
| Linux / Linux | affected 5.13; unaffected 0 before 5.13; unaffected 5.15.209 through 5.15.*; unaffected 6.1.175 through 6.1.*; unaffected 6.6.142 through 6.6.*; unaffected 6.12.92 through 6.12.*; unaffected 6.18.34 through 6.18.*; unaffected 7.0.11 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/a201c66edf2ebc6cfdc3813a889ba20fecebfae3
- https://git.kernel.org/stable/c/70ad2dff8d052a85dfef15715b531f38a29108cf
- https://git.kernel.org/stable/c/566f42fb67a7ebfed6650e407e5b72e6b3e83bf7
- https://git.kernel.org/stable/c/6180a06bbc99fd9114b8db4be6c4d46e40f046ef
- https://git.kernel.org/stable/c/09ec063d87c2dd3fa6f3561361a017bd882e9f37
- https://git.kernel.org/stable/c/3c4db56ccd13dd020fbf43afabaee74a40ec75e4
- https://git.kernel.org/stable/c/35f0f0a2536a4d604b4dbad92c85c4a8fdebb870
ADP enrichment
No English description supplied.
No references supplied.