Answer in brief
CVE-2026-64034 records a Unknown severity vulnerability in net: mana: Fix TOCTOU double-fetch of hwc_msg_id from DMA buffer. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2026-64034 records a Unknown severity vulnerability in net: mana: Fix TOCTOU double-fetch of hwc_msg_id from DMA buffer. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f <a201c66edf2ebc6cfdc3813a889ba20fecebfae3 || >=ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f <70ad2dff8d052a85dfef15715b531f38a29108cf || >=ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f <566f42fb67a7ebfed6650e407e5b72e6b3e83bf7 || >=ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f <6180a06bbc99fd9114b8db4be6c4d46e40f046ef || >=ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f <09ec063d87c2dd3fa6f3561361a017bd882e9f37 || >=ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f <3c4db56ccd13dd020fbf43afabaee74a40ec75e4 || >=ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f <35f0f0a2536a4d604b4dbad92c85c4a8fdebb870 | a201c66edf2ebc6cfdc3813a889ba20fecebfae3, 70ad2dff8d052a85dfef15715b531f38a29108cf, 566f42fb67a7ebfed6650e407e5b72e6b3e83bf7, 6180a06bbc99fd9114b8db4be6c4d46e40f046ef, 09ec063d87c2dd3fa6f3561361a017bd882e9f37, 3c4db56ccd13dd020fbf43afabaee74a40ec75e4, 35f0f0a2536a4d604b4dbad92c85c4a8fdebb870 |
| Linux/Linuxgeneric | 5.13 | Not reported |
Published upstream
Jul 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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().
Quoted source text, attributed separately from HOL analysis.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f <a201c66edf2ebc6cfdc3813a889ba20fecebfae3 || >=ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f <70ad2dff8d052a85dfef15715b531f38a29108cf || >=ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f <566f42fb67a7ebfed6650e407e5b72e6b3e83bf7 || >=ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f <6180a06bbc99fd9114b8db4be6c4d46e40f046ef || >=ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f <09ec063d87c2dd3fa6f3561361a017bd882e9f37 || >=ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f <3c4db56ccd13dd020fbf43afabaee74a40ec75e4 || >=ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f <35f0f0a2536a4d604b4dbad92c85c4a8fdebb870 | a201c66edf2ebc6cfdc3813a889ba20fecebfae3, 70ad2dff8d052a85dfef15715b531f38a29108cf, 566f42fb67a7ebfed6650e407e5b72e6b3e83bf7, 6180a06bbc99fd9114b8db4be6c4d46e40f046ef, 09ec063d87c2dd3fa6f3561361a017bd882e9f37, 3c4db56ccd13dd020fbf43afabaee74a40ec75e4, 35f0f0a2536a4d604b4dbad92c85c4a8fdebb870 |
| Linux/Linuxgeneric | 5.13 | Not reported |
Published upstream
Jul 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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().
Quoted source text, attributed separately from HOL analysis.