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CVE-2026-46064: Linux

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Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

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    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: ibmasm: fix heap over-read in ibmasm_send_i2o_message() The ibmasm_send_i2o_message() function uses get_dot_command_size() to compute the byte count for memcpy_toio(), but this value is derived from user-controlled fields in the dot_command_header (command_size: u8, data_size: u16) and is never validated against the actual allocation size. A root user can write a small buffer with inflated header fields, causing memcpy_toio() to read up to ~65 KB past the end of the allocation into adjacent kernel heap, which is then forwarded to the service processor over MMIO. Silently clamping the copy size is not sufficient: if the header fields claim a larger size than the buffer, the SP receives a dot command whose own header is inconsistent with the I2O message length, which can cause the SP to desynchronize. Reject such commands outright by returning failure. Validate command_size before calling get_mfa_inbound() to avoid leaking an I2O message frame: reading INBOUND_QUEUE_PORT dequeues a hardware frame from the controller's free pool, and returning without a corresponding set_mfa_inbound() call would permanently exhaust it. Additionally, clamp command_size to I2O_COMMAND_SIZE before the memcpy_toio() so the MMIO write stays within the I2O message frame, consistent with the clamping already performed by outgoing_message_size() for the header field.

    Засегнати продукти

    • Linux Linux: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди ca1c857e2bb74a9fc0606128334f85316d57067b; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди b870f652877bfbe321bd0f4096fc37a93296f7b6; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди ce57fa439bd1b5d664f334a0c3e3f0e42abb0153; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди fd19eb1c75047a4ed4e855f56cafd704dc3914e0; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди fe31722b0194ff76bf8b461e8bf97a2081147787; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди c1c2417c60dbdca5ebb00462f21ee71c2d7f7083; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 9e8f6c9d4ecddda2f28baa1678340286cff3969c; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 9aad71144fa3682cca3837a06c8623016790e7ec
    • Linux Linux: 2.6.12; преди 2.6.12; 5.10.258 до 5.10.*; 5.15.209 до 5.15.*; 6.1.175 до 6.1.*; 6.6.140 до 6.6.*; 6.12.86 до 6.12.*; 6.18.27 до 6.18.*; 7.0.4 до 7.0.*; от 7.1 нататък
    • Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem: всички версии

    История

    • 27 май 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-46064: Linux | freedomonline.bg