Answer in brief
CVE-2026-89856 records a Unknown severity vulnerability in scsi: qla2xxx: Clamp MSI-X derived queue counts to avoid truncation. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=d74595278f4ab192af66d9e60a9087464638beee <cf623d32761b00f221a9cfded3303d56e84b429d || >=d74595278f4ab192af66d9e60a9087464638beee <9eeddbeaa896f39d943644b16d83a6ad0ceab255 || >=d74595278f4ab192af66d9e60a9087464638beee <802068b9b683b8008fcccbf6e9ad133e597ec87c || >=d74595278f4ab192af66d9e60a9087464638beee <e80adfeac61b4d5db7ffe0f5af43999c33a4145e || >=d74595278f4ab192af66d9e60a9087464638beee <2efe50b2da829909023de4a2eb87badb7cfa53cc || >=d74595278f4ab192af66d9e60a9087464638beee <7a448f5ed0b283dbde4e9183dd1e98c221432dab || >=d74595278f4ab192af66d9e60a9087464638beee <33c77254e6e91f37c72c7fad4051777452b10de8 || >=d74595278f4ab192af66d9e60a9087464638beee <ebfd35c64433821bd5619a6d07ccc2df8b5b1de3 | cf623d32761b00f221a9cfded3303d56e84b429d, 9eeddbeaa896f39d943644b16d83a6ad0ceab255, 802068b9b683b8008fcccbf6e9ad133e597ec87c, e80adfeac61b4d5db7ffe0f5af43999c33a4145e, 2efe50b2da829909023de4a2eb87badb7cfa53cc, 7a448f5ed0b283dbde4e9183dd1e98c221432dab, 33c77254e6e91f37c72c7fad4051777452b10de8, ebfd35c64433821bd5619a6d07ccc2df8b5b1de3 |
| Linux/Linuxgeneric | 4.10 | Not reported |
Published upstream
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 16, 2026
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).
Quoted source text, attributed separately from HOL analysis.