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().
| Vendor | Product | Versions |
|---|---|---|
| linux | linux_kernel | cac2661c53f35cbe651bef9b07026a5a05ab8ce0, cac2661c53f35cbe651bef9b07026a5a05ab8ce0, cac2661c53f35cbe651bef9b07026a5a05ab8ce0, cac2661c53f35cbe651bef9b07026a5a05ab8ce0, cac2661c53f35cbe651bef9b07026a5a05ab8ce0, cac2661c53f35cbe651bef9b07026a5a05ab8ce0, cac2661c53f35cbe651bef9b07026a5a05ab8ce0, cac2661c53f35cbe651bef9b07026a5a05ab8ce0, cac2661c53f35cbe651bef9b07026a5a05ab8ce0, cac2661c53f35cbe651bef9b07026a5a05ab8ce0, 4.11 |
Downstream vendors/products affected by this vulnerability
| Vendor | Product | Source | Confidence |
|---|---|---|---|
| linux | linux | mitre_affected | 90% |
| open source | linux kernel | cert_advisory | 90% |
Added detailed description of CVE-2026-43500 and included a new CWE ID.
Updated CVSS from 8.8 to 7.9 and added detailed technical description of the vulnerabilities.
Updated description with more technical detail about the vulnerabilities and added the tag 'Dirty Frag'.
Updated description with new technical details, added CVE-2026-46300, changed severity to CRITICAL, and included new IoCs and tags.
Updated affected versions, severity to HIGH, added new CWE-463, and included new tags related to Fragnesia.
Updated description with detailed exploit information, changed severity to CRITICAL, and added new affected versions and tags.
Updated description with detailed exploit information, added affected versions, changed severity to CRITICAL, and included new CWE IDs and tags.
Added CWE-20 and new tags related to Moxa security advisory.
Added a detailed description of the vulnerability and included the new affected version 4.10 along with new tags related to the vulnerability.
Added affected version f4c50a4034e6 and updated severity to CRITICAL.
Added new affected version f4c50a4034e6 and included the new tag 'fragnesia'.
Updated description with new technical details about the vulnerability and added new IoCs and tags related to the exploit.
Added affected version 7.7.3 for Tails and included new CVE IDs CVE-2026-43284 and CVE-2026-43500.
Updated description with new details about the discovery and impact, changed severity to IMPORTANT, and noted that no patch is currently available.
Updated description with detailed technical information about the Dirty Frag exploit and added new CWE and tags.
Updated description with detailed technical information, added new CWE IDs, and included new tags related to the vulnerability.
Updated description with detailed technical information about the Dirty Frag exploit and changed severity from NONE to HIGH.
Updated description with new technical details, added affected versions, changed severity to HIGH, and included new CWE and tags.
Updated description with details on publicly available Proof of Concepts and added affected environments and tags.
Updated description with details on CVE-2026-43284 and CVE-2026-43500, added CWE-123, marked as actively exploited, and noted that no universal fix is available.
Updated description with details about the 'Dirty Frag' vulnerability and added new CVE IDs and tags.
Updated affected versions to include 6.6.137, 6.12.86, 6.18.27, 7.0.4 and changed severity to CRITICAL.
Initial creation
