CVE-2026-89856

CVE CVE-2026-89856EUVD EUVD-2026-80456Published 2026-09-16T10:31:29.000ZLast changed 2026-09-16T14:39:20.000ZCVSS 8.4

What the advisory describes

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).

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

• Linux — Linux d74595278f4ab192af66d9e60a9087464638beee <2efe50b2da829909023de4a2eb87badb7cfa53cc; patch: 5.15.221; patch: 6.6.157; patch: 7.2.5; patch: 0; d74595278f4ab192af66d9e60a9087464638beee <ebfd35c64433821bd5619a6d07ccc2df8b5b1de3; d74595278f4ab192af66d9e60a9087464638beee <9eeddbeaa896f39d943644b16d83a6ad0ceab255; 4.10; d74595278f4ab192af66d9e60a9087464638beee <33c77254e6e91f37c72c7fad4051777452b10de8; d74595278f4ab192af66d9e60a9087464638beee <cf623d32761b00f221a9cfded3303d56e84b429d; patch: 5.10.270; d74595278f4ab192af66d9e60a9087464638beee <802068b9b683b8008fcccbf6e9ad133e597ec87c; patch: 6.1.188; patch: 6.12.110; patch: 7.3-rc1; patch: 6.18.51; d74595278f4ab192af66d9e60a9087464638beee <7a448f5ed0b283dbde4e9183dd1e98c221432dab; d74595278f4ab192af66d9e60a9087464638beee <e80adfeac61b4d5db7ffe0f5af43999c33a4145e

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

• Linux — Linux

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