{"id":"CVE-2026-98370","state":"PUBLISHED","title":"xfrm: fix compat ALLOCSPI request use-after-free","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: fix compat ALLOCSPI request use-after-free\n\nxfrm_state_netlink() builds the ALLOCSPI response with\ndump_one_state(), which already calls alloc_compat() with the response\nskb and header.\n\nxfrm_alloc_userspi() then calls alloc_compat() again, but passes the\noriginal request skb and its header. For a compat request, the\ntranslator therefore interprets the 228-byte compat xfrm_userspi_info\nas the 232-byte native layout and reads four bytes past the declared\npayload. It also publishes the translated child through the request's\nfrag_list.\n\nA multicast clone of the request shares skb_shared_info and can observe\nthat child. xfrm_user_rcv_msg() frees it after the request handler\nreturns, racing a compat receiver which may still be copying from it and\nresulting in a use-after-free.\n\nRemove the redundant conversion. The response keeps its correct compat\ntranslation from dump_one_state(), and no child is attached to the\ninbound request.","publishedAt":"2026-10-06T08:46:54.981Z","updatedAt":"2026-10-19T09:18:22.245Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3","status":"affected","lessThan":"494f2bee9d8d0ebcfa249ac41bed7fed26d119b4","versionType":"git"},{"version":"5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3","status":"affected","lessThan":"17893987e52918c23945c42e47e894a936305a25","versionType":"git"},{"version":"5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3","status":"affected","lessThan":"42971ea17c7a8afc0bdd5ca40648bf4e5bb7b810","versionType":"git"},{"version":"5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3","status":"affected","lessThan":"2b63341e2ebc9b6f73cbd9214dbe7d46dd98c718","versionType":"git"},{"version":"5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3","status":"affected","lessThan":"bb63ab52a18273ec68340ac49aebbaa7b514ccd5","versionType":"git"},{"version":"5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3","status":"affected","lessThan":"248433942155b42a0ef04a5806c8aca024ea7c33","versionType":"git"},{"version":"5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3","status":"affected","lessThan":"e70f639aee2ff0def155c256cace9e0f81d998e2","versionType":"git"},{"version":"5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3","status":"affected","lessThan":"d1ebd9081879fd9ae9c8fb7e8928f19cc88ae320","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/xfrm/xfrm_user.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.10","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.54","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.8","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/xfrm/xfrm_user.c"]}],"references":["https://git.kernel.org/stable/c/494f2bee9d8d0ebcfa249ac41bed7fed26d119b4","https://git.kernel.org/stable/c/17893987e52918c23945c42e47e894a936305a25","https://git.kernel.org/stable/c/42971ea17c7a8afc0bdd5ca40648bf4e5bb7b810","https://git.kernel.org/stable/c/2b63341e2ebc9b6f73cbd9214dbe7d46dd98c718","https://git.kernel.org/stable/c/bb63ab52a18273ec68340ac49aebbaa7b514ccd5","https://git.kernel.org/stable/c/248433942155b42a0ef04a5806c8aca024ea7c33","https://git.kernel.org/stable/c/e70f639aee2ff0def155c256cace9e0f81d998e2","https://git.kernel.org/stable/c/d1ebd9081879fd9ae9c8fb7e8928f19cc88ae320"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98370.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98370","state":"PUBLISHED","datePublished":"2026-10-06T08:46:54.981Z","dateUpdated":"2026-10-19T09:18:22.245Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.344Z"},"containers":{"cna":{"title":"xfrm: fix compat ALLOCSPI request use-after-free","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: fix compat ALLOCSPI request use-after-free\n\nxfrm_state_netlink() builds the ALLOCSPI response with\ndump_one_state(), which already calls alloc_compat() with the response\nskb and header.\n\nxfrm_alloc_userspi() then calls alloc_compat() again, but passes the\noriginal request skb and its header. For a compat request, the\ntranslator therefore interprets the 228-byte compat xfrm_userspi_info\nas the 232-byte native layout and reads four bytes past the declared\npayload. It also publishes the translated child through the request's\nfrag_list.\n\nA multicast clone of the request shares skb_shared_info and can observe\nthat child. xfrm_user_rcv_msg() frees it after the request handler\nreturns, racing a compat receiver which may still be copying from it and\nresulting in a use-after-free.\n\nRemove the redundant conversion. The response keeps its correct compat\ntranslation from dump_one_state(), and no child is attached to the\ninbound request."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3","status":"affected","lessThan":"494f2bee9d8d0ebcfa249ac41bed7fed26d119b4","versionType":"git"},{"version":"5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3","status":"affected","lessThan":"17893987e52918c23945c42e47e894a936305a25","versionType":"git"},{"version":"5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3","status":"affected","lessThan":"42971ea17c7a8afc0bdd5ca40648bf4e5bb7b810","versionType":"git"},{"version":"5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3","status":"affected","lessThan":"2b63341e2ebc9b6f73cbd9214dbe7d46dd98c718","versionType":"git"},{"version":"5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3","status":"affected","lessThan":"bb63ab52a18273ec68340ac49aebbaa7b514ccd5","versionType":"git"},{"version":"5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3","status":"affected","lessThan":"248433942155b42a0ef04a5806c8aca024ea7c33","versionType":"git"},{"version":"5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3","status":"affected","lessThan":"e70f639aee2ff0def155c256cace9e0f81d998e2","versionType":"git"},{"version":"5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3","status":"affected","lessThan":"d1ebd9081879fd9ae9c8fb7e8928f19cc88ae320","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/xfrm/xfrm_user.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.10","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.54","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.8","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/xfrm/xfrm_user.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/494f2bee9d8d0ebcfa249ac41bed7fed26d119b4"},{"url":"https://git.kernel.org/stable/c/17893987e52918c23945c42e47e894a936305a25"},{"url":"https://git.kernel.org/stable/c/42971ea17c7a8afc0bdd5ca40648bf4e5bb7b810"},{"url":"https://git.kernel.org/stable/c/2b63341e2ebc9b6f73cbd9214dbe7d46dd98c718"},{"url":"https://git.kernel.org/stable/c/bb63ab52a18273ec68340ac49aebbaa7b514ccd5"},{"url":"https://git.kernel.org/stable/c/248433942155b42a0ef04a5806c8aca024ea7c33"},{"url":"https://git.kernel.org/stable/c/e70f639aee2ff0def155c256cace9e0f81d998e2"},{"url":"https://git.kernel.org/stable/c/d1ebd9081879fd9ae9c8fb7e8928f19cc88ae320"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:18:22.245Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"5.10.271"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"5.15.222"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"6.1.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"6.12.112"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"6.18.54"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"7.2.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}