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().

A flaw was found in the Linux kernel's `iptfs` component, part of the IPSec framework. The `iptfs_consume_frags()` function does not correctly propagate a flag indicating shared fragments. This can cause the Encapsulating Security Payload (ESP) to make incorrect security decisions regarding in-place encryption, potentially impacting the integrity or confidentiality of network traffic.

Red Hat Enterprise Linux 10 Not affected kernel Red Hat Enterprise Linux 6 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel-rt Red Hat Enterprise Linux 8 Not affected kernel Red Hat Enterprise Linux 8 Not affected kernel-rt Red Hat Enterprise Linux 9 Not affected kernel Red Hat Enterprise Linux 9 Not affected kernel-rt https://www.cve.org/CVERecord?id=CVE-2026-53363 https://nvd.nist.gov/vuln/detail/CVE-2026-53363 https://lore.kernel.org/linux-cve-announce/2026071032-CVE-2026-53363-b97c@gregkh/T