CVE-2026-53363

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 decide correctly whether in-place encryption is safe.

Apply the same two-line fix used in skb_try_coalesce() to iptfs_consume_frags().

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxb96ba312e21c9b7ac1526829b9640ddc06695c0b < dd66f7f6e360ee82cd905517726f8e9091265de5affected
LinuxLinuxb96ba312e21c9b7ac1526829b9640ddc06695c0b < c885d111ed9f5a0a1f3cc4e87a50db6518abaa6caffected
LinuxLinuxb96ba312e21c9b7ac1526829b9640ddc06695c0b < e9096a5a170e7ecd6467bc2e08668ec39897cda7affected
LinuxLinux6.14affected
LinuxLinux0 < 6.14unaffected
LinuxLinux6.18.36 <= 6.18.*unaffected
LinuxLinux7.0.13 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References