CVE-2026-64566

CVE Enrichment

CVSS: 9.8 CRITICAL
EPSS: 0.35%
EPSS Percentile: 28.54%
CISA KEV: Not listed

Description

In the Linux kernel, the following vulnerability has been resolved: xfrm: iptfs: propagate SKBFL_SHARED_FRAG in iptfs_skb_add_frags() When iptfs_skb_add_frags() copies frag references from the source frag walk into a new SKB, it increments the page reference count via __skb_frag_ref() but does not propagate SKBFL_SHARED_FRAG to the destination SKB's skb_shinfo->flags. If the source SKB carries shared frags (e.g. from a page-pool backed receive path), the new inner SKB will appear to ESP as having privately owned frags. A subsequent esp_input() call for a nested transport-mode SA then takes the no-COW fast path and decrypts in place, writing over pages that are still referenced by the outer IPTFS SKB. This causes kernel-visible memory corruption and can trigger a panic. All other frag-transfer helpers in the kernel (skb_try_coalesce, skb_gro_receive, __pskb_copy_fclone, skb_shift, skb_segment) correctly propagate SKBFL_SHARED_FRAG; align iptfs_skb_add_frags() with this convention by setting the flag inside the loop immediately after __skb_frag_ref() and nr_frags++, so every exit path that attaches a frag unconditionally propagates SKBFL_SHARED_FRAG.

Technical Details

CVSS Version: 3.1
CNA / NVD Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published: 05-Aug-2026 15:16
Last Modified: 17-Aug-2026 12:18
EPSS Date: 2026-10-25

CVSS Vector


            CVSS:3.1                            AV:N /
                            AC:L /
                            PR:N /
                            UI:N /
                            S:U /
                            C:H /
                            I:H /
                            A:H

References

Last enrichment sync: 26-Oct-2026 01:07
Sources: NVD · FIRST EPSS · CISA KEV
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Reported Context (1)

IPTFS: CVE-2026-53363, CVE-2026-64566 Sysdig details six Linux flaws, including public root exploit for ZDI-CAN-33367

CVE (6)

People (4)

MITRE ATT&CK (2)

Vendors (3)

Products (9)

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