CVE-2024-35869Network attack vector

Kernel code execution via unrefcounted DFS child sessions

Published May 19, 2024 · Updated Aug 5, 2026

Use-after-free in the Linux kernel SMB client allows remote attackers to crash the kernel or execute code through crafted DFS referrals. The DFS mount and failover paths retain child sessions from tcon->ses without incrementing every child's reference count, allowing a cifs_ses object to be freed while later code still dereferences it. Reachability requires an existing CIFS DFS mount that processes attacker-controlled referrals; successful exploitation can expose session material, corrupt kernel control flow, or panic the host.

CVSS severity9.8
Critical
EPSS probability0.65%
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 kernel SMB client allows remote attackers to crash the kernel or execute code through crafted DFS referrals. The DFS mount and failover paths retain child sessions from tcon->ses without incrementing every child's reference count, allowing a cifs_ses object to be freed while later code still dereferences it. Reachability requires an existing CIFS DFS mount that processes attacker-controlled referrals; successful exploitation can expose session material, corrupt kernel control flow, or panic the host.

The record

CVE
CVE-2024-35869
Published
May 19, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 19, 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=6.2.15 <6.3
  2. Affected versionversion=6.3.2 <6.4
  3. Affected versionversion=6.4
  4. Affected versionversion=8e3554150d6c80a84b3cb046615d1a0e943811dc <062a7f0ff46eb57aff526897bd2bebfdb1d3046a
  5. Affected versionversion=8e3554150d6c80a84b3cb046615d1a0e943811dc <645f332c6b63499cc76197f9b6bffcc659ba64cc
  6. Affected versionversion=8e3554150d6c80a84b3cb046615d1a0e943811dc <e1db9ae87b7148c021daee1fcc4bc71b2ac58a79
  7. Affected versionversion=c082c3be0f96e759ff2e361d929832fda0b93851
  8. Affected versionversion=f30d226bcc9f0e2d97b4a6e94c43a28148fbeab6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.2.15 <6.3; version=6.3.2 <6.4; version=6.4; version=8e3554150d6c80a84b3cb046615d1a0e943811dc <062a7f0ff46eb57aff526897bd2bebfdb1d3046a; version=8e3554150d6c80a84b3cb046615d1a0e943811dc <645f332c6b63499cc76197f9b6bffcc659ba64cc; version=8e3554150d6c80a84b3cb046615d1a0e943811dc <e1db9ae87b7148c021daee1fcc4bc71b2ac58a79; version=c082c3be0f96e759ff2e361d929832fda0b93851; version=f30d226bcc9f0e2d97b4a6e94c43a28148fbeab6
The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f4 <062a7f0ff46e; version=1da177e4c3f4 <645f332c6b63; version=1da177e4c3f4 <e1db9ae87b71

Published CVSS scores

8.4CISA ADP VulnrichmentCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8Linux CNACVSS:3.1/AV:N/AC:L/PR:N/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
T1203Exploitation for Client Execution

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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