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scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done() A malicious or compromised VIO server can return a num_written value in the discover targets MAD response that exceeds max_targets. This value is stored directly in vhost->num_targets without validation, and is then used as the loop bound in ibmvfc_alloc_targets() to index into disc_buf[], which is only allocated for max_targets entries. Indices at or beyond max_targets access kernel memory outside the DMA-coherent allocation. The out-of-bounds data is subsequently embedded in Implicit Logout and PLOGI MADs that are sent back to the VIO server, leaking kernel memory. Fix by clamping num_written to max_targets before storing it.

Announced Group revision 1
Original source ↗

CVE-2026-31464

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-2026-31464

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": "072b91f9c6510d0ec4a49d07dbc318760c7da7b3",
        "lessThan": "d842348f8a00d5b1d7358f207eb34ffcf5b16df3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "072b91f9c6510d0ec4a49d07dbc318760c7da7b3",
        "lessThan": "a007246cb6c9ebdc93dafbf63cc2d43d98f402cc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "072b91f9c6510d0ec4a49d07dbc318760c7da7b3",
        "lessThan": "394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "072b91f9c6510d0ec4a49d07dbc318760c7da7b3",
        "lessThan": "4ed727e35b0ab17d3eeeb1e8023768396e2be161",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "072b91f9c6510d0ec4a49d07dbc318760c7da7b3",
        "lessThan": "d1466bf991b2343cf2ba8336e440c8faf3cbb780",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "072b91f9c6510d0ec4a49d07dbc318760c7da7b3",
        "lessThan": "786f10b1966e485046839f992e89f2c18cbd1983",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "072b91f9c6510d0ec4a49d07dbc318760c7da7b3",
        "lessThan": "bae4df0a643fa7f84663473aa3082a9c2ed139db",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "072b91f9c6510d0ec4a49d07dbc318760c7da7b3",
        "lessThan": "61d099ac4a7a8fb11ebdb6e2ec8d77f38e77362f",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/scsi/ibmvscsi/ibmvfc.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.27"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.27",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.253",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.203",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.168",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.131",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.80",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.21",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19.11",
        "versionType": "semver",
        "lessThanOrEqual": "6.19.*"
      },
      {
        "status": "unaffected",
        "version": "7.0",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/scsi/ibmvscsi/ibmvfc.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-31464

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#39884 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. CVE-2026-31464 · Revision 1Source updated