Threats Tagged 'cve-2026-53363'

A critical vulnerability in the Linux kernel's xfrm subsystem was resolved involving the iptfs_consume_frags() function. This function failed to preserve the SKBFL_SHARED_FRAG flag when transferring paged fragments between socket buffers. The missing flag propagation can lead to incorrect handling of shared fragments, affecting the security of in-place encryption decisions in ESP. The issue is similar to a previously fixed bug (CVE-2026-46300) and was addressed by applying the same fix to preserve the shared-frag marker.

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().