CVE-2026-99182 ASoC: SOF: ipc4-topology: Fix shift-out-of-bounds for aggregated ALH capture
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-99182?
CVE-2026-99182 is a vulnerability in Linux, published on 28 Oct 2026.
Official 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.
Which versions are affected by CVE-2026-99182?
How do I fix CVE-2026-99182?
Upgrade to a fixed version.
Is CVE-2026-99182 being exploited?
There is no known exploitation of CVE-2026-99182 in the wild and no public exploit code.
Sources
Also known as AZL-111347, BELL-CVE-2026-99182, DEBIAN-CVE-2026-99182, GHSA-v4wc-fj92-8998, UBUNTU-CVE-2026-99182.