CVE-2026-64355Network attack vector

Out-of-bounds kernel access via fragmented devmap clones

Published Jul 25, 2026 · Updated Jul 25, 2026

Out-of-bounds access in Linux Kernel allows remote attackers to access kernel memory via fragmented XDP frames sent through devmap. The devmap clone path copies only linear frame data while retaining XDP_FLAGS_HAS_FRAGS, so frame return treats uninitialized tailroom as fragment metadata. An XDP devmap broadcast redirect must clone fragmented traffic; the resulting invalid metadata drives the out-of-bounds access in kernel context.

CVSS severity9.8
Critical
EPSS probability0.51%
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 access in Linux Kernel allows remote attackers to access kernel memory via fragmented XDP frames sent through devmap. The devmap clone path copies only linear frame data while retaining XDP_FLAGS_HAS_FRAGS, so frame return treats uninitialized tailroom as fragment metadata. An XDP devmap broadcast redirect must clone fragmented traffic; the resulting invalid metadata drives the out-of-bounds access in kernel context.

The record

CVE
CVE-2026-64355
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.14
  2. Affected versionversion=e624d4ed4aa8cc3c69d1359b0aaea539203ed266 <07a4c11ee8ef4abcb39d922e9e410ae269671cdf
  3. Affected versionversion=e624d4ed4aa8cc3c69d1359b0aaea539203ed266 <47baddc856ae7e93a565dd9deeb797999b179466
  4. Affected versionversion=e624d4ed4aa8cc3c69d1359b0aaea539203ed266 <51d07c12ca411e692c424ecdabf077f1e61a61be
  5. Affected versionversion=e624d4ed4aa8cc3c69d1359b0aaea539203ed266 <a9bb2d9c798cb62a4050a991c27b752770c33afe
  6. Affected versionversion=e624d4ed4aa8cc3c69d1359b0aaea539203ed266 <aa496720618f1a6054f1c870bf10b4f6c99bf656
  7. Affected versionversion=e624d4ed4aa8cc3c69d1359b0aaea539203ed266 <bccbab36ff228e0825eb85d9b0f9b8434cd0a399
  8. Affected versionversion=e624d4ed4aa8cc3c69d1359b0aaea539203ed266 <c5b4f5efcb55c1af3fe44ff712d31b7fb098a831

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.14; version=e624d4ed4aa8cc3c69d1359b0aaea539203ed266 <07a4c11ee8ef4abcb39d922e9e410ae269671cdf; version=e624d4ed4aa8cc3c69d1359b0aaea539203ed266 <47baddc856ae7e93a565dd9deeb797999b179466; version=e624d4ed4aa8cc3c69d1359b0aaea539203ed266 <51d07c12ca411e692c424ecdabf077f1e61a61be; version=e624d4ed4aa8cc3c69d1359b0aaea539203ed266 <a9bb2d9c798cb62a4050a991c27b752770c33afe; version=e624d4ed4aa8cc3c69d1359b0aaea539203ed266 <aa496720618f1a6054f1c870bf10b4f6c99bf656; version=e624d4ed4aa8cc3c69d1359b0aaea539203ed266 <bccbab36ff228e0825eb85d9b0f9b8434cd0a399; version=e624d4ed4aa8cc3c69d1359b0aaea539203ed266 <c5b4f5efcb55c1af3fe44ff712d31b7fb098a831

Published CVSS scores

9.8kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/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)
Vectornetwork
Privilegesunauthenticated
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

See the directory against your own environment.

Your stack

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