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CVE-2026-31772 is a stack-based buffer overflow in the Linux kernel Bluetooth subsystem, specifically in hci_le_big_create_sync(). The flaw is caused by allocating a flexible stack buffer for struct hci_cp_le_big_create_sync with space for only 17 BIS entries, while the associated connection state can legitimately contain up to HCI_MAX_ISO_BIS, or 31, entries. The caller validates the BIS count against the higher maximum, so when conn->num_bis is between 18 and 31, the memcpy that copies conn->bis into cp->bis writes past the end of the stack buffer. The resulting out-of-bounds write can corrupt adjacent stack memory in kernel context. The upstream fix changes the allocation size from the incorrect constant 0x11 to HCI_MAX_ISO_BIS so the destination buffer matches the maximum supported number of BIS entries.
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A Linux kernel stack buffer overflow vulnerability in Bluetooth hci_sync, in hci_le_big_create_sync.
A Linux kernel Bluetooth vulnerability in hci_le_big_create_sync() causing a stack buffer overflow due to allocating space for only 17 BIS entries while up to 31 entries can be copied, leading to out-of-bounds stack writes.
A Linux kernel stack buffer overflow vulnerability in Bluetooth hci_sync during hci_le_big_create_sync.
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Cross-references every affected SKU, including bundled OEM variants.
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