CVE-2026-53363: xfrm: iptfs: preserve shared-frag marker in iptfs_consume_frags()
In the Linux kernel, the following vulnerability has been resolved:
xfrm: iptfs: preserve shared-frag marker in iptfsconsumefrags()
iptfsconsumefrags() transfers paged fragments from one socket buffer to another but fails to propagate the SKBFLSHAREDFRAG flag. This is the same class of bug that was fixed in skbtrycoalesce() 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 skbtrycoalesce() to iptfsconsumefrags().
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2026-53363?
The severity of CVE-2026-53363 is rated at risk level 42.
What does CVE-2026-53363 affect?
CVE-2026-53363 affects the Linux kernel's handling of the SKBFL_SHARED_FRAG flag in iptfs_consume_frags().
How do I fix CVE-2026-53363?
To fix CVE-2026-53363, update your Linux kernel to the patched version that resolves this vulnerability.
What is the primary issue in CVE-2026-53363?
The primary issue in CVE-2026-53363 is the failure to propagate the SKBFL_SHARED_FRAG flag during fragment transfer.
When was CVE-2026-53363 published?
CVE-2026-53363 was published on July 10, 2026.