ALSA: pcm: Don't setup bogus iov_iter for silencing

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Summary

CVECVE-2026-64134
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:55 UTC
Updated2026-07-19 16:17:55 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected cf393babb37a1679a1ec1d864df1090353465e23 41a766c647294842c9b17672449f8e011048cba9 git Not specified
CNA Linux Linux affected cf393babb37a1679a1ec1d864df1090353465e23 ce836587e594af39ff048d9b29dee0f5f10692c9 git Not specified
CNA Linux Linux affected cf393babb37a1679a1ec1d864df1090353465e23 feff0251386aa6bb180a0a1cf7c1f91ba868113d git Not specified
CNA Linux Linux affected cf393babb37a1679a1ec1d864df1090353465e23 c9f6768515818d71bdfc20119a81f3332c53b9c6 git Not specified
CNA Linux Linux affected cf393babb37a1679a1ec1d864df1090353465e23 e4d3386b74fba8e01280484b67ee481ece00201e git Not specified
CNA Linux Linux affected 6.6 Not specified
CNA Linux Linux unaffected 6.6 semver Not specified
CNA Linux Linux unaffected 6.6.142 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.92 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.34 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.11 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/c9f6768515818d71bdfc20119a81f3332c53b9c6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e4d3386b74fba8e01280484b67ee481ece00201e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ce836587e594af39ff048d9b29dee0f5f10692c9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/41a766c647294842c9b17672449f8e011048cba9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/feff0251386aa6bb180a0a1cf7c1f91ba868113d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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