CVE-2026-97408
Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: validate connectionless PSM length Connectionless L2CAP frames carry a two-byte PSM at the start of the payload. l2cap_recv_frame() currently reads that PSM unconditionally after validating only the outer L2CAP length. A malformed connectionless frame with a zero- or one-byte payload can therefore make the parser read beyond the advertised skb payload and use tailroom bytes as part of the PSM. A VHCI-backed QEMU reproducer injected a one-byte connectionless payload and reached the unchecked read. Reject connectionless frames that cannot contain the PSM before reading or pulling it. This preserves all valid connectionless frames while dropping only structurally incomplete packets.
How to fix
- Linux Linux8104cd9859b6de0826cffa68adf2c1461185823b, 9448e6f693fcf1f0ac4ee648a9b2cc83bfe4a982, 22fc1ce4e37c81d4e7aac01566ebdc232214540d, 72e26293a231f63a856340d3a1f0f5fc29bf87e5, 3502ede8aed3c3ee1786d952a11054ac737d1a38, ae69dca122f6d6046a68cf40153e6e827c77ff5c, a40a5f922546b3bd7c094d882b29177db4f2abe0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < 8104cd9859b6de0826cffa68adf2c1461185823b, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < 9448e6f693fcf1f0ac4ee648a9b2cc83bfe4a982, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < 22fc1ce4e37c81d4e7aac01566ebdc232214540d, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < 72e26293a231f63a856340d3a1f0f5fc29bf87e5, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < 3502ede8aed3c3ee1786d952a11054ac737d1a38, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < ae69dca122f6d6046a68cf40153e6e827c77ff5c, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < a40a5f922546b3bd7c094d882b29177db4f2abe0, 2.6.12 | 8104cd9859b6de0826cffa68adf2c1461185823b, 9448e6f693fcf1f0ac4ee648a9b2cc83bfe4a982, 22fc1ce4e37c81d4e7aac01566ebdc232214540d, 72e26293a231f63a856340d3a1f0f5fc29bf87e5, 3502ede8aed3c3ee1786d952a11054ac737d1a38, ae69dca122f6d6046a68cf40153e6e827c77ff5c, a40a5f922546b3bd7c094d882b29177db4f2abe0 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.