Answer in brief
CVE-2026-89856 records a High severity (CVSS 8.4) 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.
CVSS is 8.4. 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
Oct 19, 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.