Patchlage

CVE-2026-64402

CVE CVE-2026-64402EUVD EUVD-2026-48946Published 2026-07-25T08:50:45.000ZLast changed 2026-08-05T12:41:40.000ZCVSS 7.8

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: coresight: ultrasoc-smb: Fix OOB write in smb_sync_perf_buffer() When the SMB sink is used as a perf AUX sink, smb_update_buffer() calls smb_sync_perf_buffer() to copy hardware trace data into the perf AUX ring buffer pages. It derives pg_idx = head >> PAGE_SHIFT from @head, which is handle->head, and indexes dst_pages[pg_idx]. The pg_idx %= nr_pages normalization is only applied after the first loop iteration. This leaves the initial page index underived from the buffer size, which can result in an out-of-bounds write past dst_pages[] when head exceeds the AUX buffer size. Normalize head modulo the AUX buffer size before deriving the page index and offset, mirroring tmc_etr_sync_perf_buffer().

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

Products the advisory names

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Carried in the product catalogue

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