Unspecified impact via audio channel-mask underflow
Published Oct 28, 2026 · Updated Oct 28, 2026
Shift-out-of-bounds in Linux SOF audio topology handling allows attackers to cause unspecified impact via aggregated capture streams. In sound/soc/sof/ipc4-topology.c, dividing fewer channels by more aggregated devices produces zero, and GENMASK(step - 1, 0) underflows its unsigned argument into an invalid shift exponent. The trigger requires this channel/device configuration, such as mono capture across multiple SoundWire links; upstream documents a UBSAN diagnostic but no security consequence or required attacker privileges.
Summary
What happened
Shift-out-of-bounds in Linux SOF audio topology handling allows attackers to cause unspecified impact via aggregated capture streams. In sound/soc/sof/ipc4-topology.c, dividing fewer channels by more aggregated devices produces zero, and GENMASK(step - 1, 0) underflows its unsigned argument into an invalid shift exponent. The trigger requires this channel/device configuration, such as mono capture across multiple SoundWire links; upstream documents a UBSAN diagnostic but no security consequence or required attacker privileges.
The record
- CVE
- CVE-2026-99182
- Published
- Oct 28, 2026
- Updated
- Oct 28, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- Unavailable
- Privileges
- Unavailable
Timeline
How it unfolded
- Oct 28, 2026CVE publishedPublication date reported by the CVE source.
- Oct 28, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0390a102cc18cb7456d6c1f15ac51f1af90fcf9c <5e1322787c5e424a570e87c8c2c25e37552cbe3b
- Affected versionversion=0390a102cc18cb7456d6c1f15ac51f1af90fcf9c <746de48c3a250f0c264105dcbfcdf0c5001e970b
- Affected versionversion=0390a102cc18cb7456d6c1f15ac51f1af90fcf9c <cad63a7798d6a6cac1fc68732595f0a3278ff6f0
- Affected versionversion=6.3
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
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Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Activity data is delayed. The latest report is Sep 28, 2026.
Weakness, pattern, technique
No sourced classifications are available.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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