CVE-2024-47749

Kernel crash via unchecked ATID lookup

Published Oct 21, 2024 · Updated Aug 5, 2026

NULL pointer dereference in the Linux cxgb4 RDMA driver allows attackers to crash the kernel when connection handling receives an invalid ATID. The act_establish() and act_open_rpl() callbacks dereference lookup_atid()'s NULL return when the identifier is invalid or absent from the ATID table. The affected path is specific to Chelsio T4 RNIC connection handling; public records disagree on whether network traffic alone can reach it, but the bounded consequence is a kernel crash.

CVSS severity7.5
High
EPSS probability0.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in the Linux cxgb4 RDMA driver allows attackers to crash the kernel when connection handling receives an invalid ATID. The act_establish() and act_open_rpl() callbacks dereference lookup_atid()'s NULL return when the identifier is invalid or absent from the ATID table. The affected path is specific to Chelsio T4 RNIC connection handling; public records disagree on whether network traffic alone can reach it, but the bounded consequence is a kernel crash.

The record

CVE
CVE-2024-47749
Published
Oct 21, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 21, 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=2.6.35
  2. Affected versionversion=cfdda9d764362ab77b11a410bb928400e6520d57 <0d50ae281a1712b9b2ca72830a96b8f11882358d
  3. Affected versionversion=cfdda9d764362ab77b11a410bb928400e6520d57 <39cb9f39913566ec5865581135f3e8123ad1aee1
  4. Affected versionversion=cfdda9d764362ab77b11a410bb928400e6520d57 <4e1fe68d695af367506ea3c794c5969630f21697
  5. Affected versionversion=cfdda9d764362ab77b11a410bb928400e6520d57 <54aaa3ed40972511e423b604324b881425b9ff1e
  6. Affected versionversion=cfdda9d764362ab77b11a410bb928400e6520d57 <b11318dc8a1ec565300bb1a9073095af817cc508
  7. Affected versionversion=cfdda9d764362ab77b11a410bb928400e6520d57 <b12e25d91c7f97958341538c7dc63ee49d01548f
  8. Affected versionversion=cfdda9d764362ab77b11a410bb928400e6520d57 <b9c94c8ba5a713817cffd74c4bacc05187469624
  9. Affected versionversion=cfdda9d764362ab77b11a410bb928400e6520d57 <dd598ac57dcae796cb58551074660c39b43fb155
  10. Affected versionversion=cfdda9d764362ab77b11a410bb928400e6520d57 <e766e6a92410ca269161de059fff0843b8ddd65f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.35; version=cfdda9d764362ab77b11a410bb928400e6520d57 <0d50ae281a1712b9b2ca72830a96b8f11882358d; version=cfdda9d764362ab77b11a410bb928400e6520d57 <39cb9f39913566ec5865581135f3e8123ad1aee1; version=cfdda9d764362ab77b11a410bb928400e6520d57 <4e1fe68d695af367506ea3c794c5969630f21697; version=cfdda9d764362ab77b11a410bb928400e6520d57 <54aaa3ed40972511e423b604324b881425b9ff1e; version=cfdda9d764362ab77b11a410bb928400e6520d57 <b11318dc8a1ec565300bb1a9073095af817cc508; version=cfdda9d764362ab77b11a410bb928400e6520d57 <b12e25d91c7f97958341538c7dc63ee49d01548f; version=cfdda9d764362ab77b11a410bb928400e6520d57 <b9c94c8ba5a713817cffd74c4bacc05187469624; version=cfdda9d764362ab77b11a410bb928400e6520d57 <dd598ac57dcae796cb58551074660c39b43fb155; version=cfdda9d764362ab77b11a410bb928400e6520d57 <e766e6a92410ca269161de059fff0843b8ddd65f

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.5kernel.orgCVSS: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.

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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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

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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