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CVE-2026-53208: Linux

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    Описание

    Оригинално описание

    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.

    Засегнати продукти

    • Linux Linux: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди e05c4ac575b457978a7ef441053394169084869c; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди fa5823126239b3e453fac1a2fe50726c7f4a55e1; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди b20e8a98dd29b121f58fcdf51e8576119aba536a; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 214a2042b16b3c8d798a8b9ef9f36094f13a9859; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди a8335f3db15bd1e0e82e0db5d488fabc7d10d1ab; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди dedc92b96dc1d8919a3bdf2495ede68922ef7ebc; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди e2b8acf9405bd9b1baf1c54dc897b0905db689bf; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди dd214733544427587a95f66dbf3adff072568990
    • Linux Linux: 2.6.12; преди 2.6.12; 5.10.259 до 5.10.*; 5.15.210 до 5.15.*; 6.1.176 до 6.1.*; 6.6.143 до 6.6.*; 6.12.94 до 6.12.*; 6.18.36 до 6.18.*; 7.0.13 до 7.0.*; от 7.1 нататък
    • Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem: всички версии

    История

    • 25 юни 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-53208: Linux | freedomonline.bg