CVE-2026-46189

Kernel memory corruption via duplicate UAR cleanup

Published May 28, 2026 · Updated May 28, 2026

Double free in the vmw_pvrdma driver in affected Linux Kernel releases since 4.10 allows local users to corrupt kernel memory. pvrdma_alloc_ucontext() calls pvrdma_uar_free() on an error and then invokes pvrdma_dealloc_ucontext(), which releases the same UAR again. Reachability requires a local low-privileged user, an active vmw_pvrdma device, and an allocation error; the duplicate release can crash the kernel or corrupt memory.

CVSS severity7.8
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Double free in the vmw_pvrdma driver in affected Linux Kernel releases since 4.10 allows local users to corrupt kernel memory. pvrdma_alloc_ucontext() calls pvrdma_uar_free() on an error and then invokes pvrdma_dealloc_ucontext(), which releases the same UAR again. Reachability requires a local low-privileged user, an active vmw_pvrdma device, and an allocation error; the duplicate release can crash the kernel or corrupt memory.

The record

CVE
CVE-2026-46189
Published
May 28, 2026
Updated
May 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-415, T1499.004
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=29c8d9eba550c6d73d17cc1618a9f5f2a7345aa1 <0c63333ff97bd1275294fd12840a0efe9d7a4c59
  2. Affected versionversion=29c8d9eba550c6d73d17cc1618a9f5f2a7345aa1 <45d25e3ec17900bf5a9d6876ff16ceee31c4c0e0
  3. Affected versionversion=29c8d9eba550c6d73d17cc1618a9f5f2a7345aa1 <935ee27d0904aa944cbcc979094c20e5ef62eead
  4. Affected versionversion=29c8d9eba550c6d73d17cc1618a9f5f2a7345aa1 <e38e86995df27f1f854063dab1f0c6a513db3faf
  5. Affected versionversion=29c8d9eba550c6d73d17cc1618a9f5f2a7345aa1 <ecc36a82ecfcfdf3c6606d209f22ec5543c410e0
  6. Affected versionversion=4.10

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=29c8d9eba550c6d73d17cc1618a9f5f2a7345aa1 <0c63333ff97bd1275294fd12840a0efe9d7a4c59; version=29c8d9eba550c6d73d17cc1618a9f5f2a7345aa1 <45d25e3ec17900bf5a9d6876ff16ceee31c4c0e0; version=29c8d9eba550c6d73d17cc1618a9f5f2a7345aa1 <935ee27d0904aa944cbcc979094c20e5ef62eead; version=29c8d9eba550c6d73d17cc1618a9f5f2a7345aa1 <e38e86995df27f1f854063dab1f0c6a513db3faf; version=29c8d9eba550c6d73d17cc1618a9f5f2a7345aa1 <ecc36a82ecfcfdf3c6606d209f22ec5543c410e0; version=4.10

Published CVSS scores

7.8NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-415Double Free
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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