CVE-2026-74665Network attack vector

Kernel-data disclosure via stale skb length accounting

Published Aug 22, 2026 · Updated Aug 25, 2026

Out-of-bounds read in affected Linux releases starting at 6.9 allows remote attackers to disclose kernel data via fragmented UDP datagrams. In bpf_prog_run_generic_xdp(), replacing skb->data_len after an XDP fragment shrink leaves skb->len with the old fragment contribution, so __skb_datagram_iter() reads beyond the true linear tail. A reachable interface must already run generic XDP in SKB mode with a program that shrinks fragments; successful triggers leak kernel metadata and corrupt delivered datagrams.

CVSS severity9.1
Critical
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in affected Linux releases starting at 6.9 allows remote attackers to disclose kernel data via fragmented UDP datagrams. In bpf_prog_run_generic_xdp(), replacing skb->data_len after an XDP fragment shrink leaves skb->len with the old fragment contribution, so __skb_datagram_iter() reads beyond the true linear tail. A reachable interface must already run generic XDP in SKB mode with a program that shrinks fragments; successful triggers leak kernel metadata and corrupt delivered datagrams.

The record

CVE
CVE-2026-74665
Published
Aug 22, 2026
Updated
Aug 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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=6.9
  2. Affected versionversion=e6d5dbdd20aa6a86974af51deb9414cd2e7794cb <33f2b2eb33d666ecac68031e0f31424fb70528db
  3. Affected versionversion=e6d5dbdd20aa6a86974af51deb9414cd2e7794cb <5f30f9c302cea1f2ebf97abe574c1826544223d7
  4. Affected versionversion=e6d5dbdd20aa6a86974af51deb9414cd2e7794cb <72468efcc089782fa047afddd10856b11a14ef5b
  5. Affected versionversion=e6d5dbdd20aa6a86974af51deb9414cd2e7794cb <ea1ccd6d1c6370868e3b032a3fc575b9c397f2e1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.9; version=e6d5dbdd20aa6a86974af51deb9414cd2e7794cb <33f2b2eb33d666ecac68031e0f31424fb70528db; version=e6d5dbdd20aa6a86974af51deb9414cd2e7794cb <5f30f9c302cea1f2ebf97abe574c1826544223d7; version=e6d5dbdd20aa6a86974af51deb9414cd2e7794cb <72468efcc089782fa047afddd10856b11a14ef5b; version=e6d5dbdd20aa6a86974af51deb9414cd2e7794cb <ea1ccd6d1c6370868e3b032a3fc575b9c397f2e1

Published CVSS scores

9.1Linux Kernel CVE TeamCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
5.5Red HatCVSS: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

CWE-125Out-of-bounds Read

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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