{"api_version":"1","generated_at":"2026-05-08T11:00:24+00:00","cve":"CVE-2026-43284","urls":{"html":"https://cve.report/CVE-2026-43284","api":"https://cve.report/api/cve/CVE-2026-43284.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-43284","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-43284"},"summary":{"title":"xfrm: esp: avoid in-place decrypt on shared skb frags","description":"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().","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-08 08:16:43","updated_at":"2026-05-08 10:16:27"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/b54edf1e9a3fd3491bdcb82a21f8d21315271e0d","name":"https://git.kernel.org/stable/c/b54edf1e9a3fd3491bdcb82a21f8d21315271e0d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/50ed1e7873100f77abad20fd31c51029bc49cd03","name":"https://git.kernel.org/stable/c/50ed1e7873100f77abad20fd31c51029bc49cd03","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"http://www.openwall.com/lists/oss-security/2026/05/08/7","name":"http://www.openwall.com/lists/oss-security/2026/05/08/7","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/52646cbd00e765a6db9c3afe9535f26218276034","name":"https://git.kernel.org/stable/c/52646cbd00e765a6db9c3afe9535f26218276034","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/71a1d9d985d26716f74d21f18ee8cac821b06e97","name":"https://git.kernel.org/stable/c/71a1d9d985d26716f74d21f18ee8cac821b06e97","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-43284","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43284","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7da0dde68486b2d5bd7c689a9b327b77efecdfd0 50ed1e7873100f77abad20fd31c51029bc49cd03 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7da0dde68486b2d5bd7c689a9b327b77efecdfd0 b54edf1e9a3fd3491bdcb82a21f8d21315271e0d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7da0dde68486b2d5bd7c689a9b327b77efecdfd0 71a1d9d985d26716f74d21f18ee8cac821b06e97 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7da0dde68486b2d5bd7c689a9b327b77efecdfd0 52646cbd00e765a6db9c3afe9535f26218276034 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.5","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.5 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.138 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.87 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.28 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.5 7.0.* semver","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"providerMetadata":{"dateUpdated":"2026-05-08T09:32:40.130Z","orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE"},"references":[{"url":"http://www.openwall.com/lists/oss-security/2026/05/08/7"}],"title":"CVE Program Container"}],"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/ipv4/esp4.c","net/ipv4/ip_output.c","net/ipv6/esp6.c","net/ipv6/ip6_output.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"50ed1e7873100f77abad20fd31c51029bc49cd03","status":"affected","version":"7da0dde68486b2d5bd7c689a9b327b77efecdfd0","versionType":"git"},{"lessThan":"b54edf1e9a3fd3491bdcb82a21f8d21315271e0d","status":"affected","version":"7da0dde68486b2d5bd7c689a9b327b77efecdfd0","versionType":"git"},{"lessThan":"71a1d9d985d26716f74d21f18ee8cac821b06e97","status":"affected","version":"7da0dde68486b2d5bd7c689a9b327b77efecdfd0","versionType":"git"},{"lessThan":"52646cbd00e765a6db9c3afe9535f26218276034","status":"affected","version":"7da0dde68486b2d5bd7c689a9b327b77efecdfd0","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/ipv4/esp4.c","net/ipv4/ip_output.c","net/ipv6/esp6.c","net/ipv6/ip6_output.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.5"},{"lessThan":"6.5","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.138","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.87","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.28","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.5","versionType":"semver"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.138","versionStartIncluding":"6.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.87","versionStartIncluding":"6.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.28","versionStartIncluding":"6.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.5","versionStartIncluding":"6.5","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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()."}],"providerMetadata":{"dateUpdated":"2026-05-08T07:21:47.524Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/50ed1e7873100f77abad20fd31c51029bc49cd03"},{"url":"https://git.kernel.org/stable/c/b54edf1e9a3fd3491bdcb82a21f8d21315271e0d"},{"url":"https://git.kernel.org/stable/c/71a1d9d985d26716f74d21f18ee8cac821b06e97"},{"url":"https://git.kernel.org/stable/c/52646cbd00e765a6db9c3afe9535f26218276034"}],"title":"xfrm: esp: avoid in-place decrypt on shared skb frags","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-43284","datePublished":"2026-05-08T07:21:47.524Z","dateReserved":"2026-05-01T14:12:55.998Z","dateUpdated":"2026-05-08T09:32:40.130Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-08 08:16:43","lastModifiedDate":"2026-05-08 10:16:27","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"43284","Ordinal":"1","Title":"xfrm: esp: avoid in-place decrypt on shared skb frags","CVE":"CVE-2026-43284","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"43284","Ordinal":"1","NoteData":"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().","Type":"Description","Title":"xfrm: esp: avoid in-place decrypt on shared skb frags"}]}}}