CVE-2024-56694Network attack vector

Remote system deadlock via recursive BPF lock

Published Dec 28, 2024 · Updated Aug 5, 2026

Denial of service in affected Linux kernel releases allows remote attackers to deadlock the operating system via TCP data. In net/core/skmsg.c, an SK_PASS verdict without a redirect peer enqueues data back to the same socket and reacquires sk_callback_lock while it is write-locked. A host must run a sockmap/sk_skb-accelerated proxy or load balancer, but an unauthenticated remote peer can then cause a deterministic full-system hang.

CVSS severity7.5
High
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in affected Linux kernel releases allows remote attackers to deadlock the operating system via TCP data. In net/core/skmsg.c, an SK_PASS verdict without a redirect peer enqueues data back to the same socket and reacquires sk_callback_lock while it is write-locked. A host must run a sockmap/sk_skb-accelerated proxy or load balancer, but an unauthenticated remote peer can then cause a deterministic full-system hang.

The record

CVE
CVE-2024-56694
Published
Dec 28, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 28, 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=39dc9e1442385d6e9be0b6491ee488dddd55ae27 <386efa339e08563dd33e83bc951aea5d407fe578
  2. Affected versionversion=5.10.223 <5.10.233
  3. Affected versionversion=5.15.159 <5.15.174
  4. Affected versionversion=5965bc7535fb87510b724e5465ccc1a1cf00916d <6694f7acd625ed854bf6342926e771d65dad7f69
  5. Affected versionversion=6.1.91 <6.1.120
  6. Affected versionversion=6.6.31 <6.6.64
  7. Affected versionversion=6648e613226e18897231ab5e42ffc29e63fa3365 <01f1b88acfd79103da0610b45471f6c88ea98d72
  8. Affected versionversion=6648e613226e18897231ab5e42ffc29e63fa3365 <8ca2a1eeadf09862190b2810697702d803ceef2d
  9. Affected versionversion=6648e613226e18897231ab5e42ffc29e63fa3365 <f84c5ef6ca23cc2f72f3b830d74f67944684bb05
  10. Affected versionversion=6.8.10 <6.9
  11. Affected versionversion=6.9
  12. Affected versionversion=772d5729b5ff0df0d37b32db600ce635b2172f80
  13. Affected versionversion=b397a0ab8582c533ec0c6b732392f141fc364f87 <da2bc8a0c8f3ac66fdf980fc59936f851a083561
  14. Affected versionversion=c0809c128dad4c3413818384eb06a341633db973 <221109ba2127eabd0aa64718543638b58b15df56

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=39dc9e1442385d6e9be0b6491ee488dddd55ae27 <386efa339e08563dd33e83bc951aea5d407fe578; version=5.10.223 <5.10.233; version=5.15.159 <5.15.174; version=5965bc7535fb87510b724e5465ccc1a1cf00916d <6694f7acd625ed854bf6342926e771d65dad7f69; version=6.1.91 <6.1.120; version=6.6.31 <6.6.64; version=6648e613226e18897231ab5e42ffc29e63fa3365 <01f1b88acfd79103da0610b45471f6c88ea98d72; version=6648e613226e18897231ab5e42ffc29e63fa3365 <8ca2a1eeadf09862190b2810697702d803ceef2d; version=6648e613226e18897231ab5e42ffc29e63fa3365 <f84c5ef6ca23cc2f72f3b830d74f67944684bb05; version=6.8.10 <6.9; version=6.9; version=772d5729b5ff0df0d37b32db600ce635b2172f80; version=b397a0ab8582c533ec0c6b732392f141fc364f87 <da2bc8a0c8f3ac66fdf980fc59936f851a083561; version=c0809c128dad4c3413818384eb06a341633db973 <221109ba2127eabd0aa64718543638b58b15df56

Published CVSS scores

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

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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

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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