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scsi: qla2xxx: Clamp MSI-X derived queue counts to avoid truncation

Type: advisorySource: Official CVE List1 source record

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).

Announced Source revision 1
Original source ↗

CVE-2026-89856

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-89856

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "d74595278f4ab192af66d9e60a9087464638beee",
        "lessThan": "cf623d32761b00f221a9cfded3303d56e84b429d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d74595278f4ab192af66d9e60a9087464638beee",
        "lessThan": "9eeddbeaa896f39d943644b16d83a6ad0ceab255",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d74595278f4ab192af66d9e60a9087464638beee",
        "lessThan": "802068b9b683b8008fcccbf6e9ad133e597ec87c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d74595278f4ab192af66d9e60a9087464638beee",
        "lessThan": "e80adfeac61b4d5db7ffe0f5af43999c33a4145e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d74595278f4ab192af66d9e60a9087464638beee",
        "lessThan": "2efe50b2da829909023de4a2eb87badb7cfa53cc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d74595278f4ab192af66d9e60a9087464638beee",
        "lessThan": "7a448f5ed0b283dbde4e9183dd1e98c221432dab",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d74595278f4ab192af66d9e60a9087464638beee",
        "lessThan": "33c77254e6e91f37c72c7fad4051777452b10de8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d74595278f4ab192af66d9e60a9087464638beee",
        "lessThan": "ebfd35c64433821bd5619a6d07ccc2df8b5b1de3",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/scsi/qla2xxx/qla_inline.h",
      "drivers/scsi/qla2xxx/qla_isr.c",
      "drivers/scsi/qla2xxx/qla_os.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.10"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.10",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.51",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.5",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/scsi/qla2xxx/qla_inline.h",
      "drivers/scsi/qla2xxx/qla_isr.c",
      "drivers/scsi/qla2xxx/qla_os.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-89856

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#36307 · Revision 1
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Publisher date
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