CVE-2026-53363

⛔ critical

Summary

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 deci

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().

CVSS Score

9.8

Critical

EPSS Score

0.3

Exploit Probability

Published Date

2026-07-10

First Seen: 2026-07-11

📊 Relative Risk Intelligence

This CVE is Very High Risk - more severe than 90.5% of all 338,287 vulnerabilities in our database.

#31,996

Top 10% most severe

Severity Percentile

Last Modified 2026-07-22

Source NVD 🔗

CVSS Vector 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

📦 Affected Products 3

Vendor	Product	Status	Affected Versions
linux	linux_kernel	Affected	> 6.14 < 6.18.36
linux	linux_kernel	Affected	> 6.19 < 7.0.13
linux	linux_kernel	Affected	v7.1

🔗 References 3

🔗 Related CVEs 6

CVE ID	Severity	CVSS	EPSS	Summary	Published
CVE-2026-53366	⚠️ high	7.8	0.2	In the Linux kernel, the following vulnerability has been resolved: ipv4: account for fraggap on the paged allocation p...	2026-07-16
CVE-2026-53364	🔶 medium	5.5	0.1	In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_conn: Fix memory leak in hci_le_big_...	2026-07-13
CVE-2026-53365	🔶 medium	5.5	0.1	In the Linux kernel, the following vulnerability has been resolved: vsock/virtio: fix zerocopy completion for multi-skb...	2026-07-13
CVE-2026-53359	⚠️ high	8.8	0.9	In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Fix shadow paging use-after-free due to u...	2026-07-04
CVE-2026-53360	⚠️ high	8.8	0.2	In the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Require in-GHCB scratch area if GHCB v2+ ...	2026-07-04
CVE-2026-53361	⚠️ high	7.1	0.1	In the Linux kernel, the following vulnerability has been resolved: af_unix: Set gc_in_progress to true in unix_gc(). ...	2026-07-04

These CVEs affect the same products