CVE-2026-64134
Published Jul 19, 2026
Description
In the Linux kernel, the following vulnerability has been resolved: ALSA: pcm: Don't setup bogus iov_iter for silencing At transition to the iov_iter for PCM data transfer, we blindly applied the iov_iter setup also for silencing (i.e. data = NULL), and it leads to a calculation of bogus iov_iter. Fortunately this didn't cause troubles on most of architectures but it goes wrong on RISC-V now, causing a NULL dereference. Handle the NULL data case to treat the silencing in interleaved_copy() for addressing the bug above. noninterleaved_copy() has already the NULL data handling, so it doesn't need changes.
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References
Other References
https://git.kernel.org/stable/c/41a766c647294842c9b17672449f8e011048cba9
https://git.kernel.org/stable/c/c9f6768515818d71bdfc20119a81f3332c53b9c6
https://git.kernel.org/stable/c/ce836587e594af39ff048d9b29dee0f5f10692c9
https://git.kernel.org/stable/c/e4d3386b74fba8e01280484b67ee481ece00201e
https://git.kernel.org/stable/c/feff0251386aa6bb180a0a1cf7c1f91ba868113d
Frequently Asked Questions
What is CVE-2026-64134? +
In the Linux kernel, the following vulnerability has been resolved:
ALSA: pcm: Don't setup bogus iov_iter for silencing
At transition to the iov_iter for PCM data transfer, we blindly
applied the iov_iter setup also for silencing (i.e. data = NULL), and
it leads to a calculation of bogus iov_iter. Fortunately this didn't
cause troubles on most of architectures but it goes wrong on RISC-V
now, causing a NULL dereference.
Handle the NULL data case to treat the silencing in interleaved_copy()
for addressing the bug above. noninterleaved_copy() has already the
NULL data handling, so it doesn't need changes.
How do I check if I'm vulnerable to CVE-2026-64134? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.