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CVE-2026-89720: Linux

7.7

CVSS 3.1

Няма данни

Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

Няма потвърждение

Атакува се

Няма данни

Време до експлоатация

Атакува се локално, без особени условия, без вход и без действие от потребителя.

    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: ubifs: fix out-of-bounds read in signature length check ubifs_sb_verify_signature() bounds the on-disk ubifs_sig_node->len field before handing the signature payload to verify_pkcs7_signature(), but the check has the wrong sign: if (le32_to_cpu(signode->len) > snod->len + sizeof(struct ubifs_sig_node)) The signature bytes start sizeof(struct ubifs_sig_node) (UBIFS_SIG_NODE_SZ, 64 bytes) into the node, so the payload is at most snod->len - sizeof(struct ubifs_sig_node) bytes long. Adding the header size instead of subtracting it accepts a declared length up to 2 * UBIFS_SIG_NODE_SZ larger than the node actually holds -- past the end of c->sbuf, which is vmalloc(c->leb_size). verify_pkcs7_signature() -> pkcs7_parse_message() -> asn1_ber_decoder() is then handed that inflated length and reads beyond the allocation while walking the DER headers. The node length comes straight from the mounted image, so a crafted signed UBIFS image reaches this via ubifs_read_superblock() before the signature is cryptographically checked. snod->len is guaranteed to be >= UBIFS_SIG_NODE_SZ by the node scanner (c->ranges[UBIFS_SIG_NODE].min_len == UBIFS_SIG_NODE_SZ), so the corrected subtraction cannot underflow. Legitimately signed images are unaffected: a correct superblock never declares a signature longer than the node it is embedded in.

    Засегнати продукти

    • Linux Linux: 817aa094842dfc3a6b98c9582d4a647827f66201 преди ab7405bd86331cc2dbc8201699d4adc33bea75e7; 817aa094842dfc3a6b98c9582d4a647827f66201 преди 11abc34698cb3172badf8aa12e623f1bac98bbd8; 817aa094842dfc3a6b98c9582d4a647827f66201 преди 8cc3da72cf57acb4b77442ea8cec48425dff7c06; 817aa094842dfc3a6b98c9582d4a647827f66201 преди 37a9d25a563f5f9103282954ce573c4a61321e7c; 817aa094842dfc3a6b98c9582d4a647827f66201 преди f76b79d6e42af20682495bccd22f72c7164b0018; 817aa094842dfc3a6b98c9582d4a647827f66201 преди a1dc246f98bb94233effa4fa3ec7bf84700bb7d1; 817aa094842dfc3a6b98c9582d4a647827f66201 преди 83e1aa9f5f906c9b1f4949d0521f0f950a159d96; 817aa094842dfc3a6b98c9582d4a647827f66201 преди 95d27c1708bb6e8823c8e7c623f9abc2a91bf4bf
    • Linux Linux: 5.3; преди 5.3; 5.10.270 до 5.10.*; 5.15.221 до 5.15.*; 6.1.188 до 6.1.*; 6.6.157 до 6.6.*; 6.12.109 до 6.12.*; 6.18.50 до 6.18.*; 7.2.4 до 7.2.*; от 7.3 нататък

    История

    • 11 септември 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-89720: Linux | freedomonline.bg