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Linux CVE-2026-53363

| EUVDEUVD-2026-42870 CRITICAL
2026-07-10 416baaa9-dc9f-4396-8d5f-8c081fb06d67 GHSA-7xf9-r6gc-x4cm
Information Disclosure Linux Red Hat Suse
9.8
CVSS 3.1 · Vendor: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
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Severity by source

Vendor (416baaa9-dc9f-4396-8d5f-8c081fb06d67) PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SUSE
7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Primary rating from Vendor (416baaa9-dc9f-4396-8d5f-8c081fb06d67).

CVSS VectorVendor: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

4
Analysis Generated
Jul 18, 2026 - 08:31 vuln.today
CVSS changed
Jul 18, 2026 - 08:22 NVD
9.8 (CRITICAL)
CVE Published
Jul 10, 2026 - 12:17 cve.org
UNKNOWN (no severity yet)
CVE Published
Jul 10, 2026 - 12:17 cve.org
CRITICAL 9.8

DescriptionCVE.org

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().

AnalysisAI

Improper page-fragment flag handling in the Linux kernel's xfrm IP-TFS (IPTFS) code path lets in-place ESP encryption operate on read-only, shared page-cache pages, risking disclosure or corruption of memory-backed data in the encrypted stream. The bug affects kernels from 6.14 onward that use IPsec IP-TFS tunnels (RFC 9347); it is the same class of defect as CVE-2026-46300 in skb_try_coalesce(). No public exploit identified at time of analysis, and EPSS is low (0.11%, 2nd percentile), indicating little observed exploitation interest despite the 9.8 NVD score.

Same technique Information Disclosure

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Not-Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Not-Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Not-Affected

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CVE-2026-53363 vulnerability details – vuln.today
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