CVE-2024-35999Network attack vector

Mounted-share interruption via unlocked channel selection

Published May 20, 2024 · Updated Aug 5, 2026

Improper locking in the Linux SMB3 client allows remote attackers to interrupt mounted-share I/O through channel-selection races. cifs_pick_channel reads the session channel index and selects ses->chans[index] without holding chan_lock while teardown can change channel state. Exploitation requires a multichannel CIFS mount connected to a malicious, compromised, or on-path-controlled SMB server; the race can return a null or dying channel, causing I/O errors or a wedged mount.

CVSS severity7.5
High
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in the Linux SMB3 client allows remote attackers to interrupt mounted-share I/O through channel-selection races. cifs_pick_channel reads the session channel index and selects ses->chans[index] without holding chan_lock while teardown can change channel state. Exploitation requires a multichannel CIFS mount connected to a malicious, compromised, or on-path-controlled SMB server; the race can return a null or dying channel, causing I/O errors or a wedged mount.

The record

CVE
CVE-2024-35999
Published
May 20, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 20, 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=3d74c2c917e4006a3bd660d2fc7829cb2ef64113
  2. Affected versionversion=5.15.27 <5.16
  3. Affected versionversion=5.16
  4. Affected versionversion=724244cdb3828522109c88e56a0242537aefabe9 <0fcf7e219448e937681216353c9a58abae6d3c2e
  5. Affected versionversion=724244cdb3828522109c88e56a0242537aefabe9 <60ab245292280905603bc0d3654f4cf8fceccb00
  6. Affected versionversion=724244cdb3828522109c88e56a0242537aefabe9 <8094a600245e9b28eb36a13036f202ad67c1f887
  7. Affected versionversion=724244cdb3828522109c88e56a0242537aefabe9 <98c7ed29cd754ae7475dc7cb3f33399fda902729

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3d74c2c917e4006a3bd660d2fc7829cb2ef64113; version=5.15.27 <5.16; version=5.16; version=724244cdb3828522109c88e56a0242537aefabe9 <0fcf7e219448e937681216353c9a58abae6d3c2e; version=724244cdb3828522109c88e56a0242537aefabe9 <60ab245292280905603bc0d3654f4cf8fceccb00; version=724244cdb3828522109c88e56a0242537aefabe9 <8094a600245e9b28eb36a13036f202ad67c1f887; version=724244cdb3828522109c88e56a0242537aefabe9 <98c7ed29cd754ae7475dc7cb3f33399fda902729

Published CVSS scores

5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.5Linux CNACVSS:3.1/AV:N/AC:L/PR:N/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-667Improper Locking
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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