Linux Kernel SOF: ipc4-Topology Shift-Overflow in ALH Capture
CVE-2026-99182 Published on October 28, 2026
ASoC: SOF: ipc4-topology: Fix shift-out-of-bounds for aggregated ALH capture
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.
Products Associated with CVE-2026-99182
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Affected Versions
Linux:- Version 0390a102cc18cb7456d6c1f15ac51f1af90fcf9c and below cad63a7798d6a6cac1fc68732595f0a3278ff6f0 is affected.
- Version 0390a102cc18cb7456d6c1f15ac51f1af90fcf9c and below 5e1322787c5e424a570e87c8c2c25e37552cbe3b is affected.
- Version 0390a102cc18cb7456d6c1f15ac51f1af90fcf9c and below 746de48c3a250f0c264105dcbfcdf0c5001e970b is affected.
- Version 6.3 is affected.
- Before 6.3 is unaffected.
- Version 6.18.59, <= 6.18.* is unaffected.
- Version 7.2.13, <= 7.2.* is unaffected.
- Version 7.3, <= * is unaffected.