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CVE PROGRAM SOURCE RECORD8.8 High

CVE-2026-43284

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

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In 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().

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • cac2661c53f35cbe651bef9b07026a5a05ab8ce0 to < a6cb440f274a22456ef3e86b457344f1678f38f9affected
  • cac2661c53f35cbe651bef9b07026a5a05ab8ce0 to < ab8b995323e5237041472d07e5055f5f7dcdf15baffected
  • cac2661c53f35cbe651bef9b07026a5a05ab8ce0 to < fe785bb3a8096dffcc4048a85cd0c83337eeecadaffected
  • cac2661c53f35cbe651bef9b07026a5a05ab8ce0 to < 5d55c7336f8032d434adcc5fab987ccc93a44aecaffected
  • cac2661c53f35cbe651bef9b07026a5a05ab8ce0 to < 8253aab4659ca16116b522203c2a6b18dccacea7affected
  • cac2661c53f35cbe651bef9b07026a5a05ab8ce0 to < 50ed1e7873100f77abad20fd31c51029bc49cd03affected
  • cac2661c53f35cbe651bef9b07026a5a05ab8ce0 to < b54edf1e9a3fd3491bdcb82a21f8d21315271e0daffected
  • cac2661c53f35cbe651bef9b07026a5a05ab8ce0 to < 71a1d9d985d26716f74d21f18ee8cac821b06e97affected
  • cac2661c53f35cbe651bef9b07026a5a05ab8ce0 to < 52646cbd00e765a6db9c3afe9535f26218276034affected
  • cac2661c53f35cbe651bef9b07026a5a05ab8ce0 to < f4c50a4034e62ab75f1d5cdd191dd5f9c77fdff4affected

Linux Linux

Default version status: affected

  • 4.11affected
  • 0 to < 4.11unaffected
  • 5.10.255 to ≤ 5.10.*unaffected
  • 5.15.205 to ≤ 5.15.*unaffected
  • 5.15.206 to ≤ 5.15.*unaffected
  • 6.1.171 to ≤ 6.1.*unaffected
  • 6.1.172 to ≤ 6.1.*unaffected
  • 6.6.138 to ≤ 6.6.*unaffected
  • 6.12.87 to ≤ 6.12.*unaffected
  • 6.18.28 to ≤ 6.18.*unaffected
  • 7.0.5 to ≤ 7.0.*unaffected
  • 7.1 to ≤ *unaffected

References