scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done()

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Summary

CVECVE-2026-31464
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-22 14:16:42 UTC
Updated2026-05-07 18:28:45 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 8.1 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

EPSS: 0.000240000 probability, percentile 0.067850000 (date 2026-04-27)

Problem Types: CWE-125

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.1HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
3.1CNADECLARED8.1HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 d842348f8a00d5b1d7358f207eb34ffcf5b16df3 git Not specified
CNA Linux Linux affected 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 a007246cb6c9ebdc93dafbf63cc2d43d98f402cc git Not specified
CNA Linux Linux affected 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89 git Not specified
CNA Linux Linux affected 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 4ed727e35b0ab17d3eeeb1e8023768396e2be161 git Not specified
CNA Linux Linux affected 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 d1466bf991b2343cf2ba8336e440c8faf3cbb780 git Not specified
CNA Linux Linux affected 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 786f10b1966e485046839f992e89f2c18cbd1983 git Not specified
CNA Linux Linux affected 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 bae4df0a643fa7f84663473aa3082a9c2ed139db git Not specified
CNA Linux Linux affected 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 61d099ac4a7a8fb11ebdb6e2ec8d77f38e77362f git Not specified
CNA Linux Linux affected 2.6.27 Not specified
CNA Linux Linux unaffected 2.6.27 semver Not specified
CNA Linux Linux unaffected 5.10.253 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.203 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.168 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.131 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.80 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.21 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.11 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/a007246cb6c9ebdc93dafbf63cc2d43d98f402cc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/4ed727e35b0ab17d3eeeb1e8023768396e2be161 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d842348f8a00d5b1d7358f207eb34ffcf5b16df3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/bae4df0a643fa7f84663473aa3082a9c2ed139db 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d1466bf991b2343cf2ba8336e440c8faf3cbb780 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/61d099ac4a7a8fb11ebdb6e2ec8d77f38e77362f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/786f10b1966e485046839f992e89f2c18cbd1983 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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