CVE-2024-27015

PPPoE flowtable miss via wrong header offset

Published May 1, 2024 · Updated May 11, 2026

Flowtable lookup failure in affected Linux kernels allows local users to route PPPoE packets through the classical forwarding path. nf_flow_tuple_encap() reads the PPPoE header from skb_mac_header() even though ingress processing places it at skb_network_header(), producing the wrong session identifier in the lookup tuple. The condition requires configured nftables flow offload and PPPoE traffic; affected packets miss the fast path, so later Netfilter hooks process them.

CVSS severity5.5
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Flowtable lookup failure in affected Linux kernels allows local users to route PPPoE packets through the classical forwarding path. nf_flow_tuple_encap() reads the PPPoE header from skb_mac_header() even though ingress processing places it at skb_network_header(), producing the wrong session identifier in the lookup tuple. The condition requires configured nftables flow offload and PPPoE traffic; affected packets miss the fast path, so later Netfilter hooks process them.

The record

CVE
CVE-2024-27015
Published
May 1, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 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=5.13
  2. Affected versionversion=72efd585f7144a047f7da63864284764596ccad9 <4ed82dd368ad883dc4284292937b882f044e625d
  3. Affected versionversion=72efd585f7144a047f7da63864284764596ccad9 <6db5dc7b351b9569940cd1cf445e237c42cd6d27
  4. Affected versionversion=72efd585f7144a047f7da63864284764596ccad9 <e3f078103421642fcd5f05c5e70777feb10f000d
  5. Affected versionversion=72efd585f7144a047f7da63864284764596ccad9 <e719b52d0c56989b0f3475a03a6d64f182c85b56
  6. Affected versionversion=72efd585f7144a047f7da63864284764596ccad9 <f1c3c61701a0b12f4906152c1626a5de580ea3d2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.13; version=72efd585f7144a047f7da63864284764596ccad9 <4ed82dd368ad883dc4284292937b882f044e625d; version=72efd585f7144a047f7da63864284764596ccad9 <6db5dc7b351b9569940cd1cf445e237c42cd6d27; version=72efd585f7144a047f7da63864284764596ccad9 <e3f078103421642fcd5f05c5e70777feb10f000d; version=72efd585f7144a047f7da63864284764596ccad9 <e719b52d0c56989b0f3475a03a6d64f182c85b56; version=72efd585f7144a047f7da63864284764596ccad9 <f1c3c61701a0b12f4906152c1626a5de580ea3d2

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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