In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: L2CAP: reject BR/EDR signaling packets over MTUsig

net/bluetooth/l2cap_core.c:l2cap_sig_channel() accepts BR/EDR
signaling packets up to the channel MTU and dispatches each command
without enforcing the signaling MTU (MTUsig). A Bluetooth BR/EDR peer
within radio range can send a fixed-channel CID 0x0001 packet that is
larger than MTUsig and contains many L2CAP_ECHO_REQ commands before
pairing. In a real-radio stock-kernel run, one 681-byte signaling
packet containing 168 zero-length ECHO_REQ commands made the target
transmit 168 ECHO_RSP frames over about 220 ms.

Impact: a Bluetooth BR/EDR peer within radio range, before pairing, can
force 168 ECHO_RSP frames from one 681-byte fixed-channel signaling
packet containing packed ECHO_REQ commands.

Define Linux's BR/EDR signaling MTU as the spec minimum of 48 bytes and
reject any larger signaling packet with one L2CAP_COMMAND_REJECT_RSP
carrying L2CAP_REJ_MTU_EXCEEDED before any command is dispatched.

The Bluetooth Core spec wording for MTUExceeded says the reject
identifier shall match the first request command in the packet, and
that packets containing only responses shall be silently discarded.
Linux intentionally deviates from that prescription: silently
discarding desynchronizes the peer because the remote stack never
learns its responses were dropped, and locating the first request
command requires walking command headers past MTUsig, i.e. processing
bytes from a packet we have already decided is too large to process.
We therefore always emit one reject and use the identifier from the
first command header, a single fixed-offset byte read.

The unrestricted BR/EDR signaling parser and ECHO_REQ response path both
trace to the initial git import; no later introducing commit is
available for a Fixes tag.

https://git.kernel.org/stable/c/214a2042b16b3c8d798a8b9ef9f36094f13a9859

https://git.kernel.org/stable/c/a8335f3db15bd1e0e82e0db5d488fabc7d10d1ab

https://git.kernel.org/stable/c/b20e8a98dd29b121f58fcdf51e8576119aba536a

https://git.kernel.org/stable/c/dd214733544427587a95f66dbf3adff072568990

https://git.kernel.org/stable/c/dedc92b96dc1d8919a3bdf2495ede68922ef7ebc

https://git.kernel.org/stable/c/e05c4ac575b457978a7ef441053394169084869c

https://git.kernel.org/stable/c/e2b8acf9405bd9b1baf1c54dc897b0905db689bf

https://git.kernel.org/stable/c/fa5823126239b3e453fac1a2fe50726c7f4a55e1

[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","programFiles":["include/net/bluetooth/l2cap.h","net/bluetooth/l2cap_core.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"e05c4ac575b457978a7ef441053394169084869c","versionType":"git","status":"affected"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"fa5823126239b3e453fac1a2fe50726c7f4a55e1","versionType":"git","status":"affected"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"b20e8a98dd29b121f58fcdf51e8576119aba536a","versionType":"git","status":"affected"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"214a2042b16b3c8d798a8b9ef9f36094f13a9859","versionType":"git","status":"affected"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"a8335f3db15bd1e0e82e0db5d488fabc7d10d1ab","versionType":"git","status":"affected"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"dedc92b96dc1d8919a3bdf2495ede68922ef7ebc","versionType":"git","status":"affected"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"e2b8acf9405bd9b1baf1c54dc897b0905db689bf","versionType":"git","status":"affected"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"dd214733544427587a95f66dbf3adff072568990","versionType":"git","status":"affected"},{"version":"0","lessThan":"5.10.259","versionType":"semver","status":"affected"},{"version":"0","lessThan":"5.15.210","versionType":"semver","status":"affected"},{"version":"0","lessThan":"6.1.176","versionType":"semver","status":"affected"},{"version":"0","lessThan":"6.6.143","versionType":"semver","status":"affected"},{"version":"0","lessThan":"6.12.94","versionType":"semver","status":"affected"},{"version":"0","lessThan":"6.18.36","versionType":"semver","status":"affected"},{"version":"0","lessThan":"7.0.13","versionType":"semver","status":"affected"}]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","programFiles":["include/net/bluetooth/l2cap.h","net/bluetooth/l2cap_core.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"5.10.259","lessThanOrEqual":"5.10.*","versionType":"semver","status":"unaffected"},{"version":"5.15.210","lessThanOrEqual":"5.15.*","versionType":"semver","status":"unaffected"},{"version":"6.1.176","lessThanOrEqual":"6.1.*","versionType":"semver","status":"unaffected"},{"version":"6.6.143","lessThanOrEqual":"6.6.*","versionType":"semver","status":"unaffected"},{"version":"6.12.94","lessThanOrEqual":"6.12.*","versionType":"semver","status":"unaffected"},{"version":"6.18.36","lessThanOrEqual":"6.18.*","versionType":"semver","status":"unaffected"},{"version":"7.0.13","lessThanOrEqual":"7.0.*","versionType":"semver","status":"unaffected"},{"version":"7.1","lessThanOrEqual":"*","versionType":"original_commit_for_fix","status":"unaffected"}]}]