CVE-2026-97931

CVE CVE-2026-97931EUVD EUVD-2026-86785Published 2026-09-25T10:22:47.000ZLast changed 2026-09-25T14:41:39.000ZCVSS 7.0

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: ALSA: us122l: Prevent write upgrades for read mappings The hwdep mmap callback rejects read-buffer mappings that are initially writable, but leaves VM_MAYWRITE set on mappings created with PROT_READ. A process that can open the hwdep node O_RDWR can later use mprotect() to make the mapping writable. The read allocation begins with struct usb_stream. Its read_size member is used by the fault handler to decide which pages belong to the read buffer. The read VMA intentionally remains expandable because pcm_usb_stream uses mremap() after reading that size. Changing read_size first can therefore map and access pages beyond the allocation. The same member is also consumed by usb_stream_free(), where changing it can make free_pages_exact() release pages outside the allocation. Clear VM_MAYWRITE for read-buffer mappings after rejecting an initially writable VMA. This keeps the separate output-buffer mapping writable while preventing later permission upgrades.

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 patch: 6.12.111; 030a07e441296c372f946cd4065b5d831d8dc40c <0eb9dd4774af0ac4d1fd105ef2b0a1f6cec06f2f; 2.6.28; patch: 0; patch: 7.2.7; 030a07e441296c372f946cd4065b5d831d8dc40c <71c610aeb1770302ac9c9e0b9a4ecd37f1311928; patch: 6.18.53; 030a07e441296c372f946cd4065b5d831d8dc40c <d9c537b14f4982f17b103e3a2cfeee4bee6bc026; patch: 7.3-rc3; 030a07e441296c372f946cd4065b5d831d8dc40c <64a87950239867682cde128020e1a47088295e5c

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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