{"id":"CVE-2025-68363","revision":null,"records":[{"revision":"7428b359446544a3a50384ef682993d5","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2025-68363","aliases":[],"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":0,"publishedAt":"2025-12-24T10:32:51.236+00:00","modifiedAt":"2026-10-15T01:09:55.986+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/core/filter.c\"\n ],\n \"versions\": [\n {\n \"version\": \"34b2021cc61642d61c3cf943d9e71925b827941b\",\n \"lessThan\": \"b3171a5e4622e915e94599a55f4964078bdec27e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"34b2021cc61642d61c3cf943d9e71925b827941b\",\n \"lessThan\": \"97b876fa88322625228792cf7a5fd77531815a80\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"34b2021cc61642d61c3cf943d9e71925b827941b\",\n \"lessThan\": \"30ce906557a21adef4cba5901c8e995dc18263a9\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"34b2021cc61642d61c3cf943d9e71925b827941b\",\n \"lessThan\": \"1c30e4afc5507f0069cc09bd561e510e4d97fbf7\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"34b2021cc61642d61c3cf943d9e71925b827941b\",\n \"lessThan\": \"942268e2726ac7f16e3ec49dbfbbbe7cf5af9da5\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"34b2021cc61642d61c3cf943d9e71925b827941b\",\n \"lessThan\": \"d946f3c98328171fa50ddb908593cf833587f725\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/core/filter.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5.12\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.12\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.160\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.120\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.63\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.17.13\",\n \"lessThanOrEqual\": \"6.17.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.2\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.19\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/b3171a5e4622e915e94599a55f4964078bdec27e","https://git.kernel.org/stable/c/97b876fa88322625228792cf7a5fd77531815a80","https://git.kernel.org/stable/c/30ce906557a21adef4cba5901c8e995dc18263a9","https://git.kernel.org/stable/c/1c30e4afc5507f0069cc09bd561e510e4d97fbf7","https://git.kernel.org/stable/c/942268e2726ac7f16e3ec49dbfbbbe7cf5af9da5","https://git.kernel.org/stable/c/d946f3c98328171fa50ddb908593cf833587f725"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-68363","license":"CVE Program Terms of Use","key":"cve-program:CVE-2025-68363","identifiers":["CVE-2025-68363"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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