ALSA: pcm: Don't setup bogus iov_iter for silencing (CVE-2026-64134) | HOL Guard CVE

High · CVSS 7.8CVE-2026-64134

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

Answer in brief

CVE-2026-64134 records a High severity (CVSS 7.8) vulnerability in ALSA: pcm: Don't setup bogus iov_iter for silencing. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jul 19, 2026Updated Aug 13, 2026Source checked Sep 21, 2026First seen by HOL Aug 5, 2026Material review Aug 13, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.8
Exploitation: Not marked as known exploited
Affected software: 7 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
Product	Affected versions	Fixed versions
cpe:2.3:o:linux:linux_kernel::::::::	Not reported	Not reported
cpe:2.3:o:linux:linux_kernel:7.1:rc1::::::	Not reported	Not reported
cpe:2.3:o:linux:linux_kernel:7.1:rc2::::::	Not reported	Not reported
cpe:2.3:o:linux:linux_kernel:7.1:rc3::::::	Not reported	Not reported
cpe:2.3:o:linux:linux_kernel:7.1:rc4::::::	Not reported	Not reported

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=cf393babb37a1679a1ec1d864df1090353465e23 <41a766c647294842c9b17672449f8e011048cba9 \|\| >=cf393babb37a1679a1ec1d864df1090353465e23 <ce836587e594af39ff048d9b29dee0f5f10692c9 \|\| >=cf393babb37a1679a1ec1d864df1090353465e23 <feff0251386aa6bb180a0a1cf7c1f91ba868113d \|\| >=cf393babb37a1679a1ec1d864df1090353465e23 <c9f6768515818d71bdfc20119a81f3332c53b9c6 \|\| >=cf393babb37a1679a1ec1d864df1090353465e23 <e4d3386b74fba8e01280484b67ee481ece00201e	41a766c647294842c9b17672449f8e011048cba9, ce836587e594af39ff048d9b29dee0f5f10692c9, feff0251386aa6bb180a0a1cf7c1f91ba868113d, c9f6768515818d71bdfc20119a81f3332c53b9c6, e4d3386b74fba8e01280484b67ee481ece00201e
Linux/Linuxgeneric	6.6	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 41a766c647294842c9b17672449f8e011048cba9 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Jul 19, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 13, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 5, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.