CVE-2026-31464 (GCVE-0-2026-31464)

Vulnerability from cvelistv5 – Published: 2026-04-22 13:53 – Updated: 2026-05-11 22:09
VLAI
Title
scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done()
Summary
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.
Severity
8.1 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 , < d842348f8a00d5b1d7358f207eb34ffcf5b16df3 (git)
Affected: 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 , < a007246cb6c9ebdc93dafbf63cc2d43d98f402cc (git)
Affected: 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 , < 394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89 (git)
Affected: 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 , < 4ed727e35b0ab17d3eeeb1e8023768396e2be161 (git)
Affected: 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 , < d1466bf991b2343cf2ba8336e440c8faf3cbb780 (git)
Affected: 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 , < 786f10b1966e485046839f992e89f2c18cbd1983 (git)
Affected: 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 , < bae4df0a643fa7f84663473aa3082a9c2ed139db (git)
Affected: 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 , < 61d099ac4a7a8fb11ebdb6e2ec8d77f38e77362f (git)
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Linux Linux Affected: 2.6.27
Unaffected: 0 , < 2.6.27 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.168 , ≤ 6.1.* (semver)
Unaffected: 6.6.131 , ≤ 6.6.* (semver)
Unaffected: 6.12.80 , ≤ 6.12.* (semver)
Unaffected: 6.18.21 , ≤ 6.18.* (semver)
Unaffected: 6.19.11 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31464.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-19T17:41:28Z",
      "cve": "CVE-2026-31464",
      "id": "CVE-2026-31464",
      "initial_release_date": "2026-04-23T01:26:00Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "615",
      "product_status:recommended": "317",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-31464",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-31464.json",
      "version": "18"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.