CVE-2024-26811Network attack vector

Kernel-memory disclosure via unchecked IPC payload length

Published Apr 8, 2024 · Updated Aug 5, 2026

Out-of-bounds access in ksmbd in affected Linux kernels allows remote attackers to disclose kernel memory or crash the SMB service. Three IPC reply handlers trust payload_sz from ksmbd.mountd without confirming that the received message contains that many bytes, enabling copies past the slab allocation. Reachability requires ksmbd to be running; the affected replies arise during SMB session setup, share configuration, or IPC pipe operations.

CVSS severity9.8
Critical
EPSS probability0.79%
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 access in ksmbd in affected Linux kernels allows remote attackers to disclose kernel memory or crash the SMB service. Three IPC reply handlers trust payload_sz from ksmbd.mountd without confirming that the received message contains that many bytes, enabling copies past the slab allocation. Reachability requires ksmbd to be running; the affected replies arise during SMB session setup, share configuration, or IPC pipe operations.

The record

CVE
CVE-2024-26811
Published
Apr 8, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-787, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 8, 2024CVE 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=0626e6641f6b467447c81dd7678a69c66f7746cf <51a6c2af9d20203ddeeaf73314ba8854b38d01bd
  2. Affected versionversion=0626e6641f6b467447c81dd7678a69c66f7746cf <76af689a45aa44714b46d1a7de4ffdf851ded896
  3. Affected versionversion=0626e6641f6b467447c81dd7678a69c66f7746cf <88b7f1143b15b29cccb8392b4f38e75b7bb3e300
  4. Affected versionversion=0626e6641f6b467447c81dd7678a69c66f7746cf <a637fabac554270a851033f5ab402ecb90bc479c
  5. Affected versionversion=0626e6641f6b467447c81dd7678a69c66f7746cf <a677ebd8ca2f2632ccdecbad7b87641274e15aac
  6. Affected versionversion=5.15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0626e6641f6b467447c81dd7678a69c66f7746cf <51a6c2af9d20203ddeeaf73314ba8854b38d01bd; version=0626e6641f6b467447c81dd7678a69c66f7746cf <76af689a45aa44714b46d1a7de4ffdf851ded896; version=0626e6641f6b467447c81dd7678a69c66f7746cf <88b7f1143b15b29cccb8392b4f38e75b7bb3e300; version=0626e6641f6b467447c81dd7678a69c66f7746cf <a637fabac554270a851033f5ab402ecb90bc479c; version=0626e6641f6b467447c81dd7678a69c66f7746cf <a677ebd8ca2f2632ccdecbad7b87641274e15aac; version=5.15

Published CVSS scores

9.8kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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.

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

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1190Exploit Public-Facing Application

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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