CVE-2026-97931
HighCVSS 7.0Summary
In the Linux kernel, the ALSA us122l driver did not clear the VM_MAYWRITE flag for read-buffer mappings created with PROT_READ. A process with O_RDWR access to the hwdep node could later use mprotect() to make the mapping writable, then modify the read_size field and access pages beyond the allocation. The fix clears VM_MAYWRITE for read-buffer mappings.
Risk Assessment
This can lead to kernel memory corruption, system crash, or potential privilege escalation by a local user with device access. It requires opening the hwdep node in O_RDWR mode.
Recommendation
Update the Linux kernel to a version with the fix. Restrict access to USB audio devices (hwdep nodes) to trusted users.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS