CVE-2026-89843
Description
In the Linux kernel, the following vulnerability has been resolved: scsi: qla2xxx: Zero-init bsg stack buffers to avoid info leak Several bsg handlers stage their request/reply in an uninitialized 256-byte on-stack buffer (uint8_t bsg[DMA_POOL_SIZE]) and fill it via sg_copy_to_buffer(), which only copies as many bytes as the user-supplied request payload. When the request is shorter than the structure, the remainder of the buffer is left holding stale stack data. qla2x00_read_fru_status() and qla2x00_read_i2c() then copy the full structure back to the reply payload with sg_copy_from_buffer(), leaking the uninitialized stack bytes to user space. The write/update paths do not copy the buffer back, but can feed uninitialized fields to the device. Zero the stack buffer at declaration in all five handlers, mirroring the heap kzalloc() approach, so short requests can no longer expose stale memory.
How to fix
- Linux Linux1c820d0900e4aacd5020b989159f6b4b2f7d0d6a, 26bc6a2c235a70bfc9b6de412600208aca820e20, 5ab32dff910291b5e6bf6223f8a4003536c1800a, 947c6bfcf7f5ec924995bec43e3108b98c75b44e, 708c0ec1e09c52fee24b74ce9398bf3f8d1c83fd, 4fe5790674097897a1af1367d1e384f7e5a62fb7, 7881faf862ee301ecfe3adc0725bd2fa0021cd95, b93d3bb3afe1b44489927de1eb4e66e8536a5935 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 697a4bc69159c3396035b0506ffa55c4b2d0b1f4 ≤ v < 1c820d0900e4aacd5020b989159f6b4b2f7d0d6a, 697a4bc69159c3396035b0506ffa55c4b2d0b1f4 ≤ v < 26bc6a2c235a70bfc9b6de412600208aca820e20, 697a4bc69159c3396035b0506ffa55c4b2d0b1f4 ≤ v < 5ab32dff910291b5e6bf6223f8a4003536c1800a, 697a4bc69159c3396035b0506ffa55c4b2d0b1f4 ≤ v < 947c6bfcf7f5ec924995bec43e3108b98c75b44e, 697a4bc69159c3396035b0506ffa55c4b2d0b1f4 ≤ v < 708c0ec1e09c52fee24b74ce9398bf3f8d1c83fd, 697a4bc69159c3396035b0506ffa55c4b2d0b1f4 ≤ v < 4fe5790674097897a1af1367d1e384f7e5a62fb7, 697a4bc69159c3396035b0506ffa55c4b2d0b1f4 ≤ v < 7881faf862ee301ecfe3adc0725bd2fa0021cd95, 697a4bc69159c3396035b0506ffa55c4b2d0b1f4 ≤ v < b93d3bb3afe1b44489927de1eb4e66e8536a5935, 3.2 | 1c820d0900e4aacd5020b989159f6b4b2f7d0d6a, 26bc6a2c235a70bfc9b6de412600208aca820e20, 5ab32dff910291b5e6bf6223f8a4003536c1800a, 947c6bfcf7f5ec924995bec43e3108b98c75b44e, 708c0ec1e09c52fee24b74ce9398bf3f8d1c83fd, 4fe5790674097897a1af1367d1e384f7e5a62fb7, 7881faf862ee301ecfe3adc0725bd2fa0021cd95, b93d3bb3afe1b44489927de1eb4e66e8536a5935 |
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