by Kastro
Paper/Archive/CVE-2026-53363

CVE-2026-53363

Linux Linux — xfrm: iptfs: preserve shared-frag marker in iptfs_consume_frags()

EPSS 0.4%CVSS 9.8
critical.is priorityof 100
37
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 35.4.354 × 207.1No public exploit+100.0SSVC exploitation: unknown+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
Linuxb96ba312e21c9b7ac1526829b9640ddc06695c0b – < dd66f7f6e360ee82cd905517726f8e9091265de5dd66f7f6e360ee82cd905517726f8e9091265de5CNA
Linuxb96ba312e21c9b7ac1526829b9640ddc06695c0b – < c885d111ed9f5a0a1f3cc4e87a50db6518abaa6cc885d111ed9f5a0a1f3cc4e87a50db6518abaa6cCNA
Linuxb96ba312e21c9b7ac1526829b9640ddc06695c0b – < e9096a5a170e7ecd6467bc2e08668ec39897cda7e9096a5a170e7ecd6467bc2e08668ec39897cda7CNA
Linux6.146.18.36CNA

Scores by source

Linux (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

refgit.kernel.org/stable/c/dd66f7f6e360ee82cd905517726f8e9091265de5refgit.kernel.org/stable/c/c885d111ed9f5a0a1f3cc4e87a50db6518abaa6crefgit.kernel.org/stable/c/e9096a5a170e7ecd6467bc2e08668ec39897cda7