pseries/papr-hvpipe: Prevent kernel stack memory leak to userspace

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-46182
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-28 10:16:33 UTC
Updated2026-06-11 03:00:58 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: pseries/papr-hvpipe: Prevent kernel stack memory leak to userspace The hdr variable is allocated on the stack and only hdr.version and hdr.flags are initialized explicitly. Because the struct papr_hvpipe_hdr contains reserved padding bytes (reserved[3] and reserved2[40]), these could leak the uninitialized bytes to userspace after copy_to_user(). This patch fixes that by initializing the whole struct to 0.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

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

EPSS: 0.000170000 probability, percentile 0.042380000 (date 2026-06-02)

Problem Types: CWE-401

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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 cebdb522fd3edd1fe05f7b4a74a27da7dd0f8d86 0479b6e9f999cc1cbad7d9f09f574fc387e605d5 git Not specified
CNA Linux Linux affected cebdb522fd3edd1fe05f7b4a74a27da7dd0f8d86 f88f8e4485b437e0a2f96a7ff1f88aa22d925659 git Not specified
CNA Linux Linux affected cebdb522fd3edd1fe05f7b4a74a27da7dd0f8d86 cefeed44296261173a806bef988b26bc565da4be git Not specified
CNA Linux Linux affected 6.18 Not specified
CNA Linux Linux unaffected 6.18 semver Not specified
CNA Linux Linux unaffected 6.18.30 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.7 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/0479b6e9f999cc1cbad7d9f09f574fc387e605d5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/cefeed44296261173a806bef988b26bc565da4be 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f88f8e4485b437e0a2f96a7ff1f88aa22d925659 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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