IT

Tracker / CVE-2026-64034

CVE-2026-64034

Critical 9.3

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 products and versions

linux linux_kernel
linux linux_kernel · 5.13 → 5.15.209
linux linux_kernel · 5.16 → 6.1.175
linux linux_kernel · 6.13 → 6.18.34
linux linux_kernel · 6.19 → 7.0.11
linux linux_kernel · 6.2 → 6.6.142
linux linux_kernel · 6.7 → 6.12.92

Analysis

This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.

References