CVE-2024-41040

Invalid kernel read via stale conntrack pointer

Published Jul 29, 2024 · Updated Aug 5, 2026

Use-after-free in Linux kernel net/sched act_ct allows local users to trigger an invalid kernel-memory read during a conntrack clash. After __nf_conntrack_confirm resolves a clash and drops ct, tcf_ct_act passes that stale pointer to tcf_ct_flow_table_process_conn instead of retrieving ct from the packet again. Local access and an active act_ct traffic-control path are required; KASAN observed a one-byte use-after-free read in interrupt context.

CVSS severity7.0
High
EPSS probability1.00%
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 Linux kernel net/sched act_ct allows local users to trigger an invalid kernel-memory read during a conntrack clash. After __nf_conntrack_confirm resolves a clash and drops ct, tcf_ct_act passes that stale pointer to tcf_ct_flow_table_process_conn instead of retrieving ct from the packet again. Local access and an active act_ct traffic-control path are required; KASAN observed a one-byte use-after-free read in interrupt context.

The record

CVE
CVE-2024-41040
Published
Jul 29, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 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=0cc254e5aa37cf05f65bcdcdc0ac5c58010feb33 <26488172b0292bed837b95a006a3f3431d1898c3
  2. Affected versionversion=0cc254e5aa37cf05f65bcdcdc0ac5c58010feb33 <2b4d68df3f57ea746c430941ba9c03d7d8b5a23f
  3. Affected versionversion=0cc254e5aa37cf05f65bcdcdc0ac5c58010feb33 <4e71b10a100861fb27d9c5755dfd68f615629fae
  4. Affected versionversion=0cc254e5aa37cf05f65bcdcdc0ac5c58010feb33 <799a34901b634008db4a7ece3900e2b971d4c932
  5. Affected versionversion=0cc254e5aa37cf05f65bcdcdc0ac5c58010feb33 <ef472cc6693b16b202a916482df72f35d94bd69e
  6. Affected versionversion=30822781c89943b6a3ed122324ceb37cea7042a3
  7. Affected versionversion=5.10.43 <5.10.222
  8. Affected versionversion=5.12.10 <5.13
  9. Affected versionversion=5.13
  10. Affected versionversion=f07c548314776231f0d47d73ec6caa5b17e876e8 <b81a523d54ea689414f67c9fb81a5b917a41ed55

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0cc254e5aa37cf05f65bcdcdc0ac5c58010feb33 <26488172b0292bed837b95a006a3f3431d1898c3; version=0cc254e5aa37cf05f65bcdcdc0ac5c58010feb33 <2b4d68df3f57ea746c430941ba9c03d7d8b5a23f; version=0cc254e5aa37cf05f65bcdcdc0ac5c58010feb33 <4e71b10a100861fb27d9c5755dfd68f615629fae; version=0cc254e5aa37cf05f65bcdcdc0ac5c58010feb33 <799a34901b634008db4a7ece3900e2b971d4c932; version=0cc254e5aa37cf05f65bcdcdc0ac5c58010feb33 <ef472cc6693b16b202a916482df72f35d94bd69e; version=30822781c89943b6a3ed122324ceb37cea7042a3; version=5.10.43 <5.10.222; version=5.12.10 <5.13; version=5.13; version=f07c548314776231f0d47d73ec6caa5b17e876e8 <b81a523d54ea689414f67c9fb81a5b917a41ed55

Published CVSS scores

7.0National Vulnerability 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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free

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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