CVE-2026-89843 (GCVE-0-2026-89843)

Vulnerability from cvelistv5 – Published: 2026-09-16 10:31 – Updated: 2026-10-19 08:53
VLAI
Title
scsi: qla2xxx: Zero-init bsg stack buffers to avoid info leak
Summary
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6639 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 697a4bc69159c3396035b0506ffa55c4b2d0b1f4 , < 1c820d0900e4aacd5020b989159f6b4b2f7d0d6a (git)
Affected: 697a4bc69159c3396035b0506ffa55c4b2d0b1f4 , < 26bc6a2c235a70bfc9b6de412600208aca820e20 (git)
Affected: 697a4bc69159c3396035b0506ffa55c4b2d0b1f4 , < 5ab32dff910291b5e6bf6223f8a4003536c1800a (git)
Affected: 697a4bc69159c3396035b0506ffa55c4b2d0b1f4 , < 947c6bfcf7f5ec924995bec43e3108b98c75b44e (git)
Affected: 697a4bc69159c3396035b0506ffa55c4b2d0b1f4 , < 708c0ec1e09c52fee24b74ce9398bf3f8d1c83fd (git)
Affected: 697a4bc69159c3396035b0506ffa55c4b2d0b1f4 , < 4fe5790674097897a1af1367d1e384f7e5a62fb7 (git)
Affected: 697a4bc69159c3396035b0506ffa55c4b2d0b1f4 , < 7881faf862ee301ecfe3adc0725bd2fa0021cd95 (git)
Affected: 697a4bc69159c3396035b0506ffa55c4b2d0b1f4 , < b93d3bb3afe1b44489927de1eb4e66e8536a5935 (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.2
Unaffected: 0 , < 3.2 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.51 , ≤ 6.18.* (semver)
Unaffected: 7.2.5 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: qla2xxx: Zero-init bsg stack buffers to avoid info leak\n\nSeveral bsg handlers stage their request/reply in an uninitialized 256-byte\non-stack buffer (uint8_t bsg[DMA_POOL_SIZE]) and fill it via\nsg_copy_to_buffer(), which only copies as many bytes as the user-supplied\nrequest payload. When the request is shorter than the structure, the\nremainder of the buffer is left holding stale stack data.\n\nqla2x00_read_fru_status() and qla2x00_read_i2c() then copy the full\nstructure back to the reply payload with sg_copy_from_buffer(), leaking the\nuninitialized stack bytes to user space. The write/update paths do not copy\nthe buffer back, but can feed uninitialized fields to the device.\n\nZero the stack buffer at declaration in all five handlers, mirroring the\nheap kzalloc() approach, so short requests can no longer expose stale\nmemory."
        }
      ],
      "providerMetadata": {
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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    "datePublished": "2026-09-16T10:31:17.474Z",
    "dateReserved": "2026-09-11T19:38:34.770Z",
    "dateUpdated": "2026-10-19T08:53:36.264Z",
    "state": "PUBLISHED"
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          }
        ],
        "id": "CVE-2026-89843",
        "lastModified": "2026-10-19T09:18:28.240",
        "metrics": {},
        "published": "2026-09-16T11:16:51.157",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
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      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-06T01:24:32+00:00",
      "cve": "CVE-2026-89843",
      "id": "CVE-2026-89843",
      "initial_release_date": "2026-09-16T00:00:00+00:00",
      "product_status:known_affected": "203",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: scsi: qla2xxx: Zero-init bsg stack buffers to avoid info leak",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89843.json",
      "version": "3"
    }
  }
}



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How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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