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CVE-2026-89856: Linux

8.4

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: scsi: qla2xxx: Clamp MSI-X derived queue counts to avoid truncation ha->msix_count is u16, but ha->max_req_queues, ha->max_rsp_queues and ha->max_qpairs are u8. Deriving the queue count as "ha->max_req_queues = ha->msix_count - 1" therefore truncates: a board (or a misconfigured/malicious hot-plugged device) advertising 257 MSI-X vectors yields msix_count - 1 == 256, which truncates to 0. An MSI-X count of 1 zeroes it as well, and in target mode the subsequent "ha->max_req_queues--" then underflows 0 to 255. When the count is 0, qla2x00_alloc_queues() calls kzalloc_objs(struct req_que *, 0), which returns ZERO_SIZE_PTR. That is not NULL, so the allocation check passes and the following "ha->req_q_map[0] = req" dereferences ZERO_SIZE_PTR, corrupting memory or crashing the kernel. Add qla_calc_queue_count() to clamp the derived value into [1, QLA_MAX_QUEUES - 1] so it always fits in u8 and is never zero, and use it at all three derivation sites (qla25xx_iospace_config(), qla83xx_iospace_config() and qla24xx_enable_msix()). Also guard the target-mode decrement so it cannot reintroduce a zero (which would in turn underflow max_qpairs).

    Засегнати продукти

    • Linux Linux: d74595278f4ab192af66d9e60a9087464638beee преди cf623d32761b00f221a9cfded3303d56e84b429d; d74595278f4ab192af66d9e60a9087464638beee преди 9eeddbeaa896f39d943644b16d83a6ad0ceab255; d74595278f4ab192af66d9e60a9087464638beee преди 802068b9b683b8008fcccbf6e9ad133e597ec87c; d74595278f4ab192af66d9e60a9087464638beee преди e80adfeac61b4d5db7ffe0f5af43999c33a4145e; d74595278f4ab192af66d9e60a9087464638beee преди 2efe50b2da829909023de4a2eb87badb7cfa53cc; d74595278f4ab192af66d9e60a9087464638beee преди 7a448f5ed0b283dbde4e9183dd1e98c221432dab; d74595278f4ab192af66d9e60a9087464638beee преди 33c77254e6e91f37c72c7fad4051777452b10de8; d74595278f4ab192af66d9e60a9087464638beee преди ebfd35c64433821bd5619a6d07ccc2df8b5b1de3
    • Linux Linux: 4.10; преди 4.10; 5.10.270 до 5.10.*; 5.15.221 до 5.15.*; 6.1.188 до 6.1.*; 6.6.157 до 6.6.*; 6.12.110 до 6.12.*; 6.18.51 до 6.18.*; 7.2.5 до 7.2.*; от 7.3 нататък

    История

    • 16 септември 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-89856: Linux | freedomonline.bg