CVE-2024-26740

System hang via inline mirrored receive processing

Published Apr 3, 2024 · Updated May 11, 2026

Improper locking in affected Linux kernels allows local users to hang the system through an egress-to-ingress mirrored traffic redirect. The act_mirred path processes a redirected packet inline and can re-enter the originating socket while its lock remains held. Reachability requires a mirrored redirect that reverses packet flow; the resulting tcp_v4_rcv recursion deadlocks and interrupts the host.

CVSS severity5.5
Medium
EPSS probability0.18%
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 affected Linux kernels allows local users to hang the system through an egress-to-ingress mirrored traffic redirect. The act_mirred path processes a redirected packet inline and can re-enter the originating socket while its lock remains held. Reachability requires a mirrored redirect that reverses packet flow; the resulting tcp_v4_rcv recursion deadlocks and interrupts the host.

The record

CVE
CVE-2024-26740
Published
Apr 3, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 3, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=4.10
  2. Affected versionversion=53592b3640019f2834701093e38272fdfd367ad8 <52f671db18823089a02f07efc04efdb2272ddc17
  3. Affected versionversion=53592b3640019f2834701093e38272fdfd367ad8 <60ddea1600bc476e0f5e02bce0e29a460ccbf0be
  4. Affected versionversion=53592b3640019f2834701093e38272fdfd367ad8 <7c787888d164689da8b1b115f3ef562c1e843af4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.10; version=53592b3640019f2834701093e38272fdfd367ad8 <52f671db18823089a02f07efc04efdb2272ddc17; version=53592b3640019f2834701093e38272fdfd367ad8 <60ddea1600bc476e0f5e02bce0e29a460ccbf0be; version=53592b3640019f2834701093e38272fdfd367ad8 <7c787888d164689da8b1b115f3ef562c1e843af4

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/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)
Vectorlocal
Privilegesauthenticated
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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