CVE-2024-50086Network attack vector

Kernel compromise via concurrent SMB2 session requests

Published Oct 29, 2024 · Updated Aug 5, 2026

Use-after-free in the Linux ksmbd server allows remote attackers to compromise the kernel via concurrent SMB2 session requests. One pipelined request retains work->sess while a concurrent SMB2_SESSION_SETUP error path calls ksmbd_expire_session(), frees the session, and leaves the first work item dereferencing it. The ksmbd server must be enabled and reachable on TCP port 445; no credentials are required, and exploitation can crash the host or compromise kernel confidentiality and integrity.

CVSS severity9.8
Critical
EPSS probability0.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux ksmbd server allows remote attackers to compromise the kernel via concurrent SMB2 session requests. One pipelined request retains work->sess while a concurrent SMB2_SESSION_SETUP error path calls ksmbd_expire_session(), frees the session, and leaves the first work item dereferencing it. The ksmbd server must be enabled and reachable on TCP port 445; no credentials are required, and exploitation can crash the host or compromise kernel confidentiality and integrity.

The record

CVE
CVE-2024-50086
Published
Oct 29, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 29, 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

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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 <0f62358ce85b2d4c949ef1b648be01b29cec667a
  2. Affected versionversion=0626e6641f6b467447c81dd7678a69c66f7746cf <5511999e9615e4318e9142d23b29bd1597befc08
  3. Affected versionversion=0626e6641f6b467447c81dd7678a69c66f7746cf <7aa8804c0b67b3cb263a472d17f2cb50d7f1a930
  4. Affected versionversion=0626e6641f6b467447c81dd7678a69c66f7746cf <a9839c37fd813b432988f58a9d9dd59253d3eb2c
  5. Affected versionversion=0626e6641f6b467447c81dd7678a69c66f7746cf <ee371898b53a9b9b51c02d22a8c31bfb86d45f0d
  6. Affected versionversion=5.15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0626e6641f6b467447c81dd7678a69c66f7746cf <0f62358ce85b2d4c949ef1b648be01b29cec667a; version=0626e6641f6b467447c81dd7678a69c66f7746cf <5511999e9615e4318e9142d23b29bd1597befc08; version=0626e6641f6b467447c81dd7678a69c66f7746cf <7aa8804c0b67b3cb263a472d17f2cb50d7f1a930; version=0626e6641f6b467447c81dd7678a69c66f7746cf <a9839c37fd813b432988f58a9d9dd59253d3eb2c; version=0626e6641f6b467447c81dd7678a69c66f7746cf <ee371898b53a9b9b51c02d22a8c31bfb86d45f0d; version=5.15

Published CVSS scores

7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.8Linux kernel CVE teamCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.0GitHub Advisory DatabaseCVSS:3.1/AV:L/AC:H/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1210Exploitation of Remote Services

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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