CVE-2026-46132

Kernel stack disclosure via uninitialized VF broadcast buffer

Published May 28, 2026 · Updated May 28, 2026

Information disclosure in affected Linux Kernel releases starting with 5.3 allows local users to read kernel stack data through rtnetlink. rtnl_fill_vfinfo partially copies a device address into an uninitialized 32-byte ifla_vf_broadcast buffer, then returns the entire buffer to userspace. An unprivileged local process needs an exposed virtual function and can repeat requests to disclose up to 26 stack bytes per VF, including addresses or transient sensitive data.

CVSS severity5.5
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in affected Linux Kernel releases starting with 5.3 allows local users to read kernel stack data through rtnetlink. rtnl_fill_vfinfo partially copies a device address into an uninitialized 32-byte ifla_vf_broadcast buffer, then returns the entire buffer to userspace. An unprivileged local process needs an exposed virtual function and can repeat requests to disclose up to 26 stack bytes per VF, including addresses or transient sensitive data.

The record

CVE
CVE-2026-46132
Published
May 28, 2026
Updated
May 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-908
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 28, 2026CVE publishedPublication date reported by the CVE source.
  2. May 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.3
  2. Affected versionversion=75345f888f700c4ab2448287e35d48c760b202e6 <0653c0516234c8258975d268a749115fc0f0ff00
  3. Affected versionversion=75345f888f700c4ab2448287e35d48c760b202e6 <38bcc21f52246badb3154b6158dcb381d98de011
  4. Affected versionversion=75345f888f700c4ab2448287e35d48c760b202e6 <4b9e327991815e128ad3af75c3a04630a63ce3e0
  5. Affected versionversion=75345f888f700c4ab2448287e35d48c760b202e6 <c5b1b92ab7eff1a6e8c507ddde6fd02fabd0cfa8
  6. Affected versionversion=75345f888f700c4ab2448287e35d48c760b202e6 <fbe0e6197225e6a83cf113a67a4b425f8de0bcd5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.3; version=75345f888f700c4ab2448287e35d48c760b202e6 <0653c0516234c8258975d268a749115fc0f0ff00; version=75345f888f700c4ab2448287e35d48c760b202e6 <38bcc21f52246badb3154b6158dcb381d98de011; version=75345f888f700c4ab2448287e35d48c760b202e6 <4b9e327991815e128ad3af75c3a04630a63ce3e0; version=75345f888f700c4ab2448287e35d48c760b202e6 <c5b1b92ab7eff1a6e8c507ddde6fd02fabd0cfa8; version=75345f888f700c4ab2448287e35d48c760b202e6 <fbe0e6197225e6a83cf113a67a4b425f8de0bcd5

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-908Use of Uninitialized Resource

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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