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CVE-2026-31778: 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: ALSA: caiaq: fix stack out-of-bounds read in init_card The loop creates a whitespace-stripped copy of the card shortname where `len < sizeof(card->id)` is used for the bounds check. Since sizeof(card->id) is 16 and the local id buffer is also 16 bytes, writing 16 non-space characters fills the entire buffer, overwriting the terminating nullbyte. When this non-null-terminated string is later passed to snd_card_set_id() -> copy_valid_id_string(), the function scans forward with `while (*nid && ...)` and reads past the end of the stack buffer, reading the contents of the stack. A USB device with a product name containing many non-ASCII, non-space characters (e.g. multibyte UTF-8) will reliably trigger this as follows: BUG: KASAN: stack-out-of-bounds in copy_valid_id_string sound/core/init.c:696 [inline] BUG: KASAN: stack-out-of-bounds in snd_card_set_id_no_lock+0x698/0x74c sound/core/init.c:718 The off-by-one has been present since commit bafeee5b1f8d ("ALSA: snd_usb_caiaq: give better shortname") from June 2009 (v2.6.31-rc1), which first introduced this whitespace-stripping loop. The original code never accounted for the null terminator when bounding the copy. Fix this by changing the loop bound to `sizeof(card->id) - 1`, ensuring at least one byte remains as the null terminator.

    Засегнати продукти

    • Linux Linux: bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a преди 02d9c5b0b5553a391448b6d655262bd829f90234; bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a преди 3f7f8bae0d52cbd07ab04b76b6aac89ef98ee9f6; bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a преди 66194c2575a4f567577ae70b1d7561163ce791a6; bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a преди a82c1bce2d1299dd3c686a8fe48cf75b79a403c7; bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a преди 3178b62e2e31bab39f63d4c8e54bf4ee0a425627; bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a преди 3afa2e67f3523a980a2f90fd63c22322ac2b9ce0; bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a преди 7594a6464873d90fd229e5b94cdd3b92c9feabed; bafeee5b1f8d32cbf791c322b40a6fa91d8ccf7a преди 45424e871abf2a152e247a9cff78359f18dd95c0
    • Linux Linux: 2.6.31; преди 2.6.31; 5.10.253 до 5.10.*; 5.15.203 до 5.15.*; 6.1.168 до 6.1.*; 6.6.134 до 6.6.*; 6.12.81 до 6.12.*; 6.18.22 до 6.18.*; 6.19.12 до 6.19.*; от 7.0 нататък

    История

    • 1 май 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-31778: Linux | freedomonline.bg