{"id":"CVE-2026-99182","title":"ASoC: SOF: ipc4-topology: Fix shift-out-of-bounds for aggregated ALH capture","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nASoC: SOF: ipc4-topology: Fix shift-out-of-bounds for aggregated ALH capture\n\nWhen ch_count is smaller than blob->alh_cfg.device_count (e.g. a mono\ncapture stream, such…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 0390a102cc18cb7456d6c1f15ac51f1af90fcf9c < cad63a7798d6a6cac1fc68732595f0a3278ff6f0","Linux >= 0390a102cc18cb7456d6c1f15ac51f1af90fcf9c < 5e1322787c5e424a570e87c8c2c25e37552cbe3b","Linux >= 0390a102cc18cb7456d6c1f15ac51f1af90fcf9c < 746de48c3a250f0c264105dcbfcdf0c5001e970b","Linux 6.3"],"published":"2026-10-28","updated":"2026-10-28","sourceUpdated":"2026-10-28T10:35:35.193Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-99182","references":[{"url":"https://git.kernel.org/stable/c/cad63a7798d6a6cac1fc68732595f0a3278ff6f0"},{"url":"https://git.kernel.org/stable/c/5e1322787c5e424a570e87c8c2c25e37552cbe3b"},{"url":"https://git.kernel.org/stable/c/746de48c3a250f0c264105dcbfcdf0c5001e970b"}],"tags":["cve.org"],"ingestedAt":"2026-10-28T11:09:40.382Z","slug":"CVE-2026-99182","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nASoC: SOF: ipc4-topology: Fix shift-out-of-bounds for aggregated ALH capture\n\nWhen ch_count is smaller than blob->alh_cfg.device_count (e.g. a mono\ncapture stream, such as a SmartMic, aggregated across multiple SDW\nlinks), step = ch_count / blob->alh_cfg.device_count truncates to 0.\nThe subsequent GENMASK(step - 1, 0) then underflows step - 1 (u32) to\nUINT_MAX, causing GENMASK()'s internal shift to use an out-of-bounds\nexponent:\n\n  UBSAN: shift-out-of-bounds in sound/soc/sof/ipc4-topology.c:2363:13\n  shift exponent 18446744069414584384 is too large for 64-bit type 'long unsigned int'\n\nTreat ch_count < device_count the same way as the existing \"channels\nequal to output reference channels\" case: apply the same ch_mask to\nevery aggregated device instead of trying to split channels that\ncan't be evenly divided.\n\n## Affected\n\n- `Linux >= 0390a102cc18cb7456d6c1f15ac51f1af90fcf9c < cad63a7798d6a6cac1fc68732595f0a3278ff6f0`\n- `Linux >= 0390a102cc18cb7456d6c1f15ac51f1af90fcf9c < 5e1322787c5e424a570e87c8c2c25e37552cbe3b`\n- `Linux >= 0390a102cc18cb7456d6c1f15ac51f1af90fcf9c < 746de48c3a250f0c264105dcbfcdf0c5001e970b`\n- `Linux 6.3`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}