xfrm: esp: avoid in-place decrypt on shared skb frags

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Summary

CVECVE-2026-43284
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-08 08:16:43 UTC
Updated2026-05-08 10:16:27 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: xfrm: esp: avoid in-place decrypt on shared skb frags MSG_SPLICE_PAGES can attach pages from a pipe directly to an skb. TCP marks such skbs with SKBFL_SHARED_FRAG after skb_splice_from_iter(), so later paths that may modify packet data can first make a private copy. The IPv4/IPv6 datagram append paths did not set this flag when splicing pages into UDP skbs. That leaves an ESP-in-UDP packet made from shared pipe pages looking like an ordinary uncloned nonlinear skb. ESP input then takes the no-COW fast path for uncloned skbs without a frag_list and decrypts in place over data that is not owned privately by the skb. Mark IPv4/IPv6 datagram splice frags with SKBFL_SHARED_FRAG, matching TCP. Also make ESP input fall back to skb_cow_data() when the flag is present, so ESP does not decrypt externally backed frags in place. Private nonlinear skb frags still use the existing fast path. This intentionally does not change ESP output. In esp_output_head(), the path that appends the ESP trailer to existing skb tailroom without calling skb_cow_data() is not reachable for nonlinear skbs: skb_tailroom() returns zero when skb->data_len is nonzero, while ESP tailen is positive. Thus ESP output will either use the separate destination-frag path or fall back to skb_cow_data().

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 7da0dde68486b2d5bd7c689a9b327b77efecdfd0 50ed1e7873100f77abad20fd31c51029bc49cd03 git Not specified
CNA Linux Linux affected 7da0dde68486b2d5bd7c689a9b327b77efecdfd0 b54edf1e9a3fd3491bdcb82a21f8d21315271e0d git Not specified
CNA Linux Linux affected 7da0dde68486b2d5bd7c689a9b327b77efecdfd0 71a1d9d985d26716f74d21f18ee8cac821b06e97 git Not specified
CNA Linux Linux affected 7da0dde68486b2d5bd7c689a9b327b77efecdfd0 52646cbd00e765a6db9c3afe9535f26218276034 git Not specified
CNA Linux Linux affected 6.5 Not specified
CNA Linux Linux unaffected 6.5 semver Not specified
CNA Linux Linux unaffected 6.6.138 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.87 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.28 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.5 7.0.* semver Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/b54edf1e9a3fd3491bdcb82a21f8d21315271e0d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/50ed1e7873100f77abad20fd31c51029bc49cd03 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
www.openwall.com/lists/oss-security/2026/05/08/7 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
git.kernel.org/stable/c/52646cbd00e765a6db9c3afe9535f26218276034 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/71a1d9d985d26716f74d21f18ee8cac821b06e97 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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