{"id":"CVE-2026-43284","published":"2026-05-08T07:21:47Z","modified":"2026-10-15T01:19:19Z","title":"xfrm: esp: avoid in-place decrypt on shared skb frags","vendor":"Linux","product":"Linux","tier":"core","eol":null,"affectedVersions":[{"vendor":"Linux","product":"Linux","versions":[">= cac2661c53f35cbe651bef9b07026a5a05ab8ce0, < a6cb440f274a22456ef3e86b457344f1678f38f9",">= cac2661c53f35cbe651bef9b07026a5a05ab8ce0, < ab8b995323e5237041472d07e5055f5f7dcdf15b",">= cac2661c53f35cbe651bef9b07026a5a05ab8ce0, < fe785bb3a8096dffcc4048a85cd0c83337eeecad",">= cac2661c53f35cbe651bef9b07026a5a05ab8ce0, < 5d55c7336f8032d434adcc5fab987ccc93a44aec",">= cac2661c53f35cbe651bef9b07026a5a05ab8ce0, < 8253aab4659ca16116b522203c2a6b18dccacea7",">= cac2661c53f35cbe651bef9b07026a5a05ab8ce0, < 50ed1e7873100f77abad20fd31c51029bc49cd03",">= cac2661c53f35cbe651bef9b07026a5a05ab8ce0, < b54edf1e9a3fd3491bdcb82a21f8d21315271e0d",">= cac2661c53f35cbe651bef9b07026a5a05ab8ce0, < 71a1d9d985d26716f74d21f18ee8cac821b06e97",">= cac2661c53f35cbe651bef9b07026a5a05ab8ce0, < 52646cbd00e765a6db9c3afe9535f26218276034",">= cac2661c53f35cbe651bef9b07026a5a05ab8ce0, < f4c50a4034e62ab75f1d5cdd191dd5f9c77fdff4"]},{"vendor":"Linux","product":"Linux","versions":["4.11"]}],"description":{"text":"In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: esp: avoid in-place decrypt on shared skb frags\n\nMSG_SPLICE_PAGES can attach pages from a pipe directly to an skb. TCP\nmarks such skbs with SKBFL_SHARED_FRAG after skb_splice_from_iter(),\nso later paths that may modify packet data can first make a private\ncopy. The IPv4/IPv6 datagram append paths did not set this flag when\nsplicing pages into UDP skbs.\n\nThat leaves an ESP-in-UDP packet made from shared pipe pages looking\nlike an ordinary uncloned nonlinear skb. ESP input then takes the no-COW\nfast path for uncloned skbs without a frag_list and decrypts in place\nover data that is not owned privately by the skb.\n\nMark IPv4/IPv6 datagram splice frags with SKBFL_SHARED_FRAG, matching\nTCP. Also make ESP input fall back to skb_cow_data() when the flag is\npresent, so ESP does not decrypt externally backed frags in place.\nPrivate nonlinear skb frags still use the existing fast path.\n\nThis intentionally does not change ESP output. In esp_output_head(),\nthe path that appends the ESP trailer to existing skb tailroom without\ncalling skb_cow_data() is not reachable for nonlinear skbs:\nskb_tailroom() returns zero when skb->data_len is nonzero, while ESP\ntailen is positive. Thus ESP output will either use the separate\ndestination-frag path or fall back to skb_cow_data().","provenance":"source","from":"CVE.org"},"summary":{"text":"The flaw is in the Linux kernel's IPv4/IPv6 UDP datagram append paths, which fail to mark pipe pages spliced into skbs as shared, so the ESP input code (used for ESP-in-UDP) can decrypt in place over memory the skb does not own privately. An attacker with local access and low privileges can exploit this, with no user interaction required, to write over data they should not be able to modify, affecting confidentiality, integrity and availability of the system.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-29T07:11:36Z"},"cvss":{"score":8.8,"severity":"HIGH","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","provenance":"source","from":"CVE.org CNA"},"epss":{"score":0.94194,"percentile":0.99848,"date":"2026-10-30","provenance":"source"},"kev":null,"vulncheckKev":{"dateAdded":"2026-05-08","exploitedFirstSeen":"2026-05-08","ransomware":false,"evidence":[{"url":"https://www.microsoft.com/en-us/security/blog/2026/05/08/active-attack-dirty-frag-linux-vulnerability-expands-post-compromise-risk/","date":"2026-05-08"},{"url":"https://securityonline.info/the-cve-watchtower-weekly-threat-intelligence-briefing-may-4-may-10-2026/","date":"2026-05-11"},{"url":"https://securelist.com/vulnerabilities-and-exploits-in-q2-2026/121091/","date":"2026-08-26"},{"url":"https://www.nozominetworks.com/blog/kataru-iot-malware-adopts-public-lpe-exploits","date":"2026-09-09"}],"evidenceTotal":4,"provenance":"source"},"exploited":true,"otx":{"pulseCount":16,"pulses":[{"name":"KATARU: IoT Malware Adopts Public LPE Exploits","url":"https://otx.alienvault.com/pulse/6aaa40418faac298d2664b18","created":"2026-09-16"},{"name":"KATARU: IoT Malware Adopts Public LPE Exploits","url":"https://otx.alienvault.com/pulse/6aa4409a4290cc035d81500c","created":"2026-09-11"},{"name":"New KATARU IoT Malware Packs Linux Privilege Escalation Exploits and Mirai-Style DDoS Attacks","url":"https://otx.alienvault.com/pulse/6aa4168a92213bfcc9f7010d","created":"2026-09-11"},{"name":"Thailand's Ministry of Finance Targeted With Hermes AI Agent Running Unattended, Hades Implant Staged","url":"https://otx.alienvault.com/pulse/6a62e8d0067f93c04e1d4c9f","created":"2026-07-24"},{"name":"Thailand's Ministry of Finance Targeted With Hermes AI Agent Running Unattended, Hades Implant Staged","url":"https://otx.alienvault.com/pulse/6a6280a6b0f220d5330af106","created":"2026-07-23"},{"name":"Known_Cve | May 17, 2026 | Part 1/2","url":"https://otx.alienvault.com/pulse/6a087bdcf5d6f8e5402ce221","created":"2026-05-16"},{"name":"ACTUALIZACION | relacionada con productos no explotados de Google","url":"https://otx.alienvault.com/pulse/6a049d4f3f03c697a3ebbc52","created":"2026-05-13"},{"name":"Known_Cve | May 14, 2026 | Part 1/2","url":"https://otx.alienvault.com/pulse/6a0487a01a4a82d9d068e332","created":"2026-05-13"},{"name":"EbeeMay2026 Pt2","url":"https://otx.alienvault.com/pulse/6a047bb5f2b9d59bf3636161","created":"2026-05-13"},{"name":"Known_Cve | May 13, 2026 | Part 1/2","url":"https://otx.alienvault.com/pulse/6a033614c2ffc68639c724b6","created":"2026-05-12"}],"provenance":"machine"},"cwes":[{"id":"CWE-123","name":"Write-what-where 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Page-Cache Write via CVE-2026-43284","module":"exploit/linux/local/cve_2026_43284_dirty_frag","type":"exploit","disclosureDate":"2026-05-08","url":"https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/linux/local/cve_2026_43284_dirty_frag.rb"}],"first":{"date":"2026-05-08","source":"PoC-in-GitHub","url":"https://github.com/Percivalll/Dirty-Frag-Kubernetes-PoC"},"provenance":"source"},"exploitRefs":["https://github.com/V4bel/dirtyfrag"],"flow":[],"timeline":[{"date":"2026-05-08","kind":"published","label":"Published (CVE.org)","url":"https://www.cve.org/CVERecord?id=CVE-2026-43284","provenance":"source"},{"date":"2026-05-08","kind":"exploit-public","label":"First public exploit: PoC-in-GitHub; later: Metasploit 2026-05-08, Exploit-DB 2026-05-27","url":"https://github.com/Percivalll/Dirty-Frag-Kubernetes-PoC","provenance":"source"},{"date":"2026-05-08","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV 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product","points":0.0,"detail":"supported or unknown"}]}}