{"api_version":"1","generated_at":"2026-07-24T19:47:40+00:00","cve":"CVE-2025-68363","urls":{"html":"https://cve.report/CVE-2025-68363","api":"https://cve.report/api/cve/CVE-2025-68363.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2025-68363","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2025-68363"},"summary":{"title":"bpf: Check skb->transport_header is set in bpf_skb_check_mtu","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Check skb->transport_header is set in bpf_skb_check_mtu\n\nThe bpf_skb_check_mtu helper needs to use skb->transport_header when\nthe BPF_MTU_CHK_SEGS flag is used:\n\n\tbpf_skb_check_mtu(skb, ifindex, &mtu_len, 0, BPF_MTU_CHK_SEGS)\n\nThe transport_header is not always set. There is a WARN_ON_ONCE\nreport when CONFIG_DEBUG_NET is enabled + skb->gso_size is set +\nbpf_prog_test_run is used:\n\nWARNING: CPU: 1 PID: 2216 at ./include/linux/skbuff.h:3071\n skb_gso_validate_network_len\n bpf_skb_check_mtu\n bpf_prog_3920e25740a41171_tc_chk_segs_flag # A test in the next patch\n bpf_test_run\n bpf_prog_test_run_skb\n\nFor a normal ingress skb (not test_run), skb_reset_transport_header\nis performed but there is plan to avoid setting it as described in\ncommit 2170a1f09148 (\"net: no longer reset transport_header in __netif_receive_skb_core()\").\n\nThis patch fixes the bpf helper by checking\nskb_transport_header_was_set(). The check is done just before\nskb->transport_header is used, to avoid breaking the existing bpf prog.\nThe WARN_ON_ONCE is limited to bpf_prog_test_run, so targeting bpf-next.","state":"PUBLISHED","assigner":"Linux","published_at":"2025-12-24 11:15:59","updated_at":"2026-07-14 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Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-68363","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 34b2021cc61642d61c3cf943d9e71925b827941b b3171a5e4622e915e94599a55f4964078bdec27e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 34b2021cc61642d61c3cf943d9e71925b827941b 97b876fa88322625228792cf7a5fd77531815a80 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 34b2021cc61642d61c3cf943d9e71925b827941b 30ce906557a21adef4cba5901c8e995dc18263a9 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 34b2021cc61642d61c3cf943d9e71925b827941b 1c30e4afc5507f0069cc09bd561e510e4d97fbf7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Check skb->transport_header is set in bpf_skb_check_mtu\n\nThe bpf_skb_check_mtu helper needs to use skb->transport_header when\nthe BPF_MTU_CHK_SEGS flag is used:\n\n\tbpf_skb_check_mtu(skb, ifindex, &mtu_len, 0, BPF_MTU_CHK_SEGS)\n\nThe transport_header is not always set. There is a WARN_ON_ONCE\nreport when CONFIG_DEBUG_NET is enabled + skb->gso_size is set +\nbpf_prog_test_run is used:\n\nWARNING: CPU: 1 PID: 2216 at ./include/linux/skbuff.h:3071\n skb_gso_validate_network_len\n bpf_skb_check_mtu\n bpf_prog_3920e25740a41171_tc_chk_segs_flag # A test in the next patch\n bpf_test_run\n bpf_prog_test_run_skb\n\nFor a normal ingress skb (not test_run), skb_reset_transport_header\nis performed but there is plan to avoid setting it as described in\ncommit 2170a1f09148 (\"net: no longer reset transport_header in __netif_receive_skb_core()\").\n\nThis patch fixes the bpf helper by checking\nskb_transport_header_was_set(). The check is done just before\nskb->transport_header is used, to avoid breaking the existing bpf prog.\nThe WARN_ON_ONCE is limited to bpf_prog_test_run, so targeting bpf-next."}],"providerMetadata":{"dateUpdated":"2026-05-11T21:51:45.485Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/b3171a5e4622e915e94599a55f4964078bdec27e"},{"url":"https://git.kernel.org/stable/c/97b876fa88322625228792cf7a5fd77531815a80"},{"url":"https://git.kernel.org/stable/c/30ce906557a21adef4cba5901c8e995dc18263a9"},{"url":"https://git.kernel.org/stable/c/1c30e4afc5507f0069cc09bd561e510e4d97fbf7"},{"url":"https://git.kernel.org/stable/c/942268e2726ac7f16e3ec49dbfbbbe7cf5af9da5"},{"url":"https://git.kernel.org/stable/c/d946f3c98328171fa50ddb908593cf833587f725"}],"title":"bpf: Check skb->transport_header is set in bpf_skb_check_mtu","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2025-68363","datePublished":"2025-12-24T10:32:51.236Z","dateReserved":"2025-12-16T14:48:05.308Z","dateUpdated":"2026-07-14T12:44:03.957Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2025-12-24 11:15:59","lastModifiedDate":"2026-07-14 13:17:58","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2025","CveId":"68363","Ordinal":"1","Title":"bpf: Check skb->transport_header is set in bpf_skb_check_mtu","CVE":"CVE-2025-68363","Year":"2025"},"notes":[{"CveYear":"2025","CveId":"68363","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Check skb->transport_header is set in bpf_skb_check_mtu\n\nThe bpf_skb_check_mtu helper needs to use skb->transport_header when\nthe BPF_MTU_CHK_SEGS flag is used:\n\n\tbpf_skb_check_mtu(skb, ifindex, &mtu_len, 0, BPF_MTU_CHK_SEGS)\n\nThe transport_header is not always set. There is a WARN_ON_ONCE\nreport when CONFIG_DEBUG_NET is enabled + skb->gso_size is set +\nbpf_prog_test_run is used:\n\nWARNING: CPU: 1 PID: 2216 at ./include/linux/skbuff.h:3071\n skb_gso_validate_network_len\n bpf_skb_check_mtu\n bpf_prog_3920e25740a41171_tc_chk_segs_flag # A test in the next patch\n bpf_test_run\n bpf_prog_test_run_skb\n\nFor a normal ingress skb (not test_run), skb_reset_transport_header\nis performed but there is plan to avoid setting it as described in\ncommit 2170a1f09148 (\"net: no longer reset transport_header in __netif_receive_skb_core()\").\n\nThis patch fixes the bpf helper by checking\nskb_transport_header_was_set(). The check is done just before\nskb->transport_header is used, to avoid breaking the existing bpf prog.\nThe WARN_ON_ONCE is limited to bpf_prog_test_run, so targeting bpf-next.","Type":"Description","Title":"bpf: Check skb->transport_header is set in bpf_skb_check_mtu"}]}}}