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  4. CVE 2026 53363 xfrm iptfs preserve shared frag marker in
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Back to active CVEs
Critical · CVSS 9.8CVE-2026-53363

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

Answer in brief

CVE-2026-53363 records a Critical severity (CVSS 9.8) vulnerability in xfrm: iptfs: preserve shared-frag marker in iptfs_consume_frags(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jul 10, 2026Updated Aug 5, 2026Source checked Nov 4, 2026First seen by HOL Jul 10, 2026Material review Aug 5, 2026
Upstream Advisory

Key facts

Risk
Critical · CVSS 9.8
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Linux/Linuxgeneric>=b96ba312e21c9b7ac1526829b9640ddc06695c0b <dd66f7f6e360ee82cd905517726f8e9091265de5 || >=b96ba312e21c9b7ac1526829b9640ddc06695c0b <c885d111ed9f5a0a1f3cc4e87a50db6518abaa6c || >=b96ba312e21c9b7ac1526829b9640ddc06695c0b <e9096a5a170e7ecd6467bc2e08668ec39897cda7dd66f7f6e360ee82cd905517726f8e9091265de5, c885d111ed9f5a0a1f3cc4e87a50db6518abaa6c, e9096a5a170e7ecd6467bc2e08668ec39897cda7
Linux/Linuxgeneric6.14Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
  2. 2Review the reported fix. Update Linux/Linux to dd66f7f6e360ee82cd905517726f8e9091265de5 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Jul 10, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Aug 5, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Jul 10, 2026

Sources and claim methodology

  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
Upstream source 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().

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
Not reported
Source
CVE List V5
Source checked
Nov 4, 2026
References
3 linked sources
Open source record