CVE-2025-22042Network attack vector

Kernel-memory disclosure via lease-context bounds omission

Published Apr 16, 2025 · Updated Aug 5, 2026

Out-of-bounds read in Linux ksmbd allows remote authenticated users to disclose kernel memory via a crafted SMB2 CREATE request. smb2_find_context_vals accepts a 20-byte RqLs context with zero data length, after which fixed-offset reads consume up to 36 bytes beyond it. A valid SMB session and tree connection are normally required; the first 16 adjacent bytes are echoed, while a guard-page over-read can panic hardened kernels.

CVSS severity8.1
High
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Linux ksmbd allows remote authenticated users to disclose kernel memory via a crafted SMB2 CREATE request. smb2_find_context_vals accepts a 20-byte RqLs context with zero data length, after which fixed-offset reads consume up to 36 bytes beyond it. A valid SMB session and tree connection are normally required; the first 16 adjacent bytes are echoed, while a guard-page over-read can panic hardened kernels.

The record

CVE
CVE-2025-22042
Published
Apr 16, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=0626e6641f6b467447c81dd7678a69c66f7746cf <60b7207893a8a06c78441934931a08fdad63f18e
  2. Affected versionversion=0626e6641f6b467447c81dd7678a69c66f7746cf <629dd37acc336ad778979361c351e782053ea284
  3. Affected versionversion=0626e6641f6b467447c81dd7678a69c66f7746cf <800c482c9ef5910f05e3a713943c67cc6c1d4939
  4. Affected versionversion=0626e6641f6b467447c81dd7678a69c66f7746cf <9a1b6ea955e6c7b29939a6d98701202f9d9644ec
  5. Affected versionversion=0626e6641f6b467447c81dd7678a69c66f7746cf <a41cd52f00907a040ca22c73d4805bb79b0d0972
  6. Affected versionversion=0626e6641f6b467447c81dd7678a69c66f7746cf <bab703ed8472aa9d109c5f8c1863921533363dae
  7. Affected versionversion=5.15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0626e6641f6b467447c81dd7678a69c66f7746cf <60b7207893a8a06c78441934931a08fdad63f18e; version=0626e6641f6b467447c81dd7678a69c66f7746cf <629dd37acc336ad778979361c351e782053ea284; version=0626e6641f6b467447c81dd7678a69c66f7746cf <800c482c9ef5910f05e3a713943c67cc6c1d4939; version=0626e6641f6b467447c81dd7678a69c66f7746cf <9a1b6ea955e6c7b29939a6d98701202f9d9644ec; version=0626e6641f6b467447c81dd7678a69c66f7746cf <a41cd52f00907a040ca22c73d4805bb79b0d0972; version=0626e6641f6b467447c81dd7678a69c66f7746cf <bab703ed8472aa9d109c5f8c1863921533363dae; version=5.15

Published CVSS scores

8.1Linux Kernel CVE TeamCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1190Exploit Public-Facing Application

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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