{"schema":"threatline.record/2","record":{"id":"CVE-2026-98239","aliases":[],"summary":"net: lan743x: fix RX checksum use-after-free","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: lan743x: fix RX checksum use-after-free\n\nlan743x_rx_process_buffer() adds each non-first receive buffer to the\nhead skb's frag_list.  On the last descriptor, lan743x_rx_trim_skb()\nlinearizes the head and frees the fragment skb metadata.\n\nThe checksum-success path then writes ip_summed through the local skb\npointer, which still points to the final fragment.  This causes a\nuse-after-free write when a packet spans more than one receive buffer.\n\nSet ip_summed on the surviving head skb instead.  Multi-buffer receive\ncan occur after a live MTU increase because existing ring entries keep\ntheir old buffer size until they are replenished.\n\nA KUnit test invoking lan743x_rx_process_buffer() with a two-buffer\npacket produced a one-byte KASAN use-after-free write before this change.\nThe same test passed after the change.  The driver object also builds\nwith W=1.  This was not tested on physical LAN743x hardware.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98239","source_modified_at":"2026-10-19T09:16:10.911Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"cd6910501cfd9a3bdff2f5fc33c9f3cf165ca54a","lessThan":"0e52886c4324c9897c2c62f92be3dc8316cee67e","status":"affected","versionType":"git"},{"version":"cd6910501cfd9a3bdff2f5fc33c9f3cf165ca54a","lessThan":"a58024835c704419bb46d2a34e5223f65605f958","status":"affected","versionType":"git"},{"version":"cd6910501cfd9a3bdff2f5fc33c9f3cf165ca54a","lessThan":"6fe5c3a2503983abb431d93faeadfc7f5e6a7e33","status":"affected","versionType":"git"},{"version":"cd6910501cfd9a3bdff2f5fc33c9f3cf165ca54a","lessThan":"5c216bfa9fb7b36804485e67975e9c98055b31ef","status":"affected","versionType":"git"},{"version":"cd6910501cfd9a3bdff2f5fc33c9f3cf165ca54a","lessThan":"161a403c8625e152de03d1da22bbf9cda6dc9f9f","status":"affected","versionType":"git"},{"version":"cd6910501cfd9a3bdff2f5fc33c9f3cf165ca54a","lessThan":"a9ce4053dc945c5372dedba5017ee675b30dc0c5","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98239","source_modified_at":"2026-10-19T09:16:10.911Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"6.1","status":"affected"},{"version":"0","lessThan":"6.1","status":"unaffected","versionType":"semver"},{"version":"6.1.189","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.158","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.112","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.54","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.8","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98239","source_modified_at":"2026-10-19T09:16:10.911Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"0e52886c4324c9897c2c62f92be3dc8316cee67e","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98239","source_modified_at":"2026-10-19T09:16:10.911Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"6fe5c3a2503983abb431d93faeadfc7f5e6a7e33","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98239","source_modified_at":"2026-10-19T09:16:10.911Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"5c216bfa9fb7b36804485e67975e9c98055b31ef","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98239","source_modified_at":"2026-10-19T09:16:10.911Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"161a403c8625e152de03d1da22bbf9cda6dc9f9f","basis":"first unaffected version stated in the CVE record"}],"cvss":8.1,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00473,"percentile":0.39985,"score_date":"2026-10-23"},"published_at":"2026-10-06T08:45:10.611Z","modified_at":"2026-10-19T09:16:10.911Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98239","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:16:10.911Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98239","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/0e52886c4324c9897c2c62f92be3dc8316cee67e"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/a58024835c704419bb46d2a34e5223f65605f958"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/6fe5c3a2503983abb431d93faeadfc7f5e6a7e33"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/5c216bfa9fb7b36804485e67975e9c98055b31ef"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/161a403c8625e152de03d1da22bbf9cda6dc9f9f"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/a9ce4053dc945c5372dedba5017ee675b30dc0c5"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-19T09:16:10.911Z","content_hash":"ed5f9d01a389d2be6523dba8467db46abadc7e24205009864a677da931e6e238"}}