CVE-2022-50338

Kernel memory corruption via stale Binder VMA pointer

Published Sep 15, 2025 · Updated Sep 15, 2025

Use-after-free in the Linux kernel Binder driver allows local users to corrupt kernel memory through concurrent Binder and munmap operations. The binder_update_page_range function reads alloc->vma while munmap can detach and free that VMA under only a shared mmap lock, leaving vm_insert_page to dereference stale memory. The CNA rejected this identifier after assigning the issue to CVE-2022-50240; triggering requires local Binder access and can crash the kernel or compromise kernel memory.

CVSS severity7.8
High
EPSS probabilityUnavailable
No score available in this record
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux kernel Binder driver allows local users to corrupt kernel memory through concurrent Binder and munmap operations. The binder_update_page_range function reads alloc->vma while munmap can detach and free that VMA under only a shared mmap lock, leaving vm_insert_page to dereference stale memory. The CNA rejected this identifier after assigning the issue to CVE-2022-50240; triggering requires local Binder access and can crash the kernel or compromise kernel memory.

The record

CVE
CVE-2022-50338
Published
Sep 15, 2025
Updated
Sep 15, 2025
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 2025Record 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=4.20
  2. Affected versionversion=dd2283f2605e3b3e9c61bcae844b34f2afa4813f <27a594bc7a7c8238d239e3cdbcf2edfa3bbe9a1b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.20; version=dd2283f2605e3b3e9c61bcae844b34f2afa4813f <27a594bc7a7c8238d239e3cdbcf2edfa3bbe9a1b

Published CVSS scores

7.8Linux kernel CNACVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1068Exploitation for Privilege Escalation

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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