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CVE-2026-53363— xfrm: iptfs: preserve shared-frag marker in iptfs_consume_frags()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 6.14版本存在安全漏洞，该漏洞源于iptfs_consume_frags()未能传播SKBFL_SHARED_FRAG标志，可能导致基于只读页面缓存页面的片段合并时，ESP无法正确判断原地加密是否安全。

CVSS 9.8 · Critical EPSS 0.32% · P23

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux b96ba312e21c9b7ac1526829b9640ddc06695c0b< dd66f7f6e360ee82cd905517726f8e9091265de5 affected
b96ba312e21c9b7ac1526829b9640ddc06695c0b< c885d111ed9f5a0a1f3cc4e87a50db6518abaa6c affected
b96ba312e21c9b7ac1526829b9640ddc06695c0b< e9096a5a170e7ecd6467bc2e08668ec39897cda7 affected
6.14 affected
< 6.14 unaffected
6.18.36≤ 6.18.* unaffected
7.0.13≤ 7.0.* unaffected
7.1≤ * unaffected
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I. Basic Information for CVE-2026-53363

Vulnerability Information
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Vulnerability Title
xfrm: iptfs: preserve shared-frag marker in iptfs_consume_frags()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: xfrm: iptfs: preserve shared-frag marker in iptfs_consume_frags() iptfs_consume_frags() transfers paged fragments from one socket buffer to another but fails to propagate the SKBFL_SHARED_FRAG flag. This is the same class of bug that was fixed in skb_try_coalesce() for CVE-2026-46300: when fragments backed by read-only page-cache pages are merged, the marker indicating their shared nature must be preserved so that ESP can decide correctly whether in-place encryption is safe. Apply the same two-line fix used in skb_try_coalesce() to iptfs_consume_frags().
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 6.14版本存在安全漏洞，该漏洞源于iptfs_consume_frags()未能传播SKBFL_SHARED_FRAG标志，可能导致基于只读页面缓存页面的片段合并时，ESP无法正确判断原地加密是否安全。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux b96ba312e21c9b7ac1526829b9640ddc06695c0b ~ dd66f7f6e360ee82cd905517726f8e9091265de5 -
Linux Linux 6.14 -

II. Public POCs for CVE-2026-53363

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III. Intelligence Information for CVE-2026-53363

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Patches & Fixes for CVE-2026-53363 (3)

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-53363

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