CVE-2026-64034

CVE CVE-2026-64034EUVD EUVD-2026-45607Published 2026-07-19T15:39:23.000ZLast changed 2026-08-05T12:38:28.000ZCVSS 9.3

What the advisory describes

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().

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f <6180a06bbc99fd9114b8db4be6c4d46e40f046ef; patch: 6.1.175; patch: 7.0.11; ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f <35f0f0a2536a4d604b4dbad92c85c4a8fdebb870; patch: 7.1; patch: 5.15.209; ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f <09ec063d87c2dd3fa6f3561361a017bd882e9f37; ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f <566f42fb67a7ebfed6650e407e5b72e6b3e83bf7; ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f <70ad2dff8d052a85dfef15715b531f38a29108cf; patch: 6.18.34; patch: 6.6.142; ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f <a201c66edf2ebc6cfdc3813a889ba20fecebfae3; 5.13; ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f <3c4db56ccd13dd020fbf43afabaee74a40ec75e4; patch: 0; patch: 6.12.92

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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