CVE-2026-53363Network attack vector

Remote page-cache corruption via dropped shared-frag marker

Published Jul 10, 2026 · Updated Jul 10, 2026

Memory corruption in the Linux Kernel IP-TFS path allows remote attackers to alter data or crash hosts through configured ESP tunnels. iptfs_consume_frags() moves paged fragments between socket buffers without propagating SKBFL_SHARED_FRAG, causing ESP to encrypt shared read-only page-cache fragments in place. The path is reachable only when an IP-TFS tunnel carries file-backed splice or sendfile output; the resulting page-cache corruption can alter data and destabilize the host.

CVSS severity9.8
Critical
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

Memory corruption in the Linux Kernel IP-TFS path allows remote attackers to alter data or crash hosts through configured ESP tunnels. iptfs_consume_frags() moves paged fragments between socket buffers without propagating SKBFL_SHARED_FRAG, causing ESP to encrypt shared read-only page-cache fragments in place. The path is reachable only when an IP-TFS tunnel carries file-backed splice or sendfile output; the resulting page-cache corruption can alter data and destabilize the host.

The record

CVE
CVE-2026-53363
Published
Jul 10, 2026
Updated
Jul 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 10, 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=6.14
  2. Affected versionversion=b96ba312e21c9b7ac1526829b9640ddc06695c0b <c885d111ed9f5a0a1f3cc4e87a50db6518abaa6c
  3. Affected versionversion=b96ba312e21c9b7ac1526829b9640ddc06695c0b <dd66f7f6e360ee82cd905517726f8e9091265de5
  4. Affected versionversion=b96ba312e21c9b7ac1526829b9640ddc06695c0b <e9096a5a170e7ecd6467bc2e08668ec39897cda7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.14; version=b96ba312e21c9b7ac1526829b9640ddc06695c0b <c885d111ed9f5a0a1f3cc4e87a50db6518abaa6c; version=b96ba312e21c9b7ac1526829b9640ddc06695c0b <dd66f7f6e360ee82cd905517726f8e9091265de5; version=b96ba312e21c9b7ac1526829b9640ddc06695c0b <e9096a5a170e7ecd6467bc2e08668ec39897cda7

Published CVSS scores

9.8Linux Kernel CNACVSS: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

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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