{"id":"CVE-2025-68363","state":"PUBLISHED","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.","publishedAt":"2025-12-24T10:32:51.236Z","updatedAt":"2026-10-15T01:09:55.986Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"34b2021cc61642d61c3cf943d9e71925b827941b","status":"affected","lessThan":"b3171a5e4622e915e94599a55f4964078bdec27e","versionType":"git"},{"version":"34b2021cc61642d61c3cf943d9e71925b827941b","status":"affected","lessThan":"97b876fa88322625228792cf7a5fd77531815a80","versionType":"git"},{"version":"34b2021cc61642d61c3cf943d9e71925b827941b","status":"affected","lessThan":"30ce906557a21adef4cba5901c8e995dc18263a9","versionType":"git"},{"version":"34b2021cc61642d61c3cf943d9e71925b827941b","status":"affected","lessThan":"1c30e4afc5507f0069cc09bd561e510e4d97fbf7","versionType":"git"},{"version":"34b2021cc61642d61c3cf943d9e71925b827941b","status":"affected","lessThan":"942268e2726ac7f16e3ec49dbfbbbe7cf5af9da5","versionType":"git"},{"version":"34b2021cc61642d61c3cf943d9e71925b827941b","status":"affected","lessThan":"d946f3c98328171fa50ddb908593cf833587f725","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/core/filter.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.12","versionType":"semver"},{"version":"6.1.160","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.120","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.63","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.17.13","status":"unaffected","lessThanOrEqual":"6.17.*","versionType":"semver"},{"version":"6.18.2","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/core/filter.c"]}],"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","https://cert-portal.siemens.com/productcert/html/ssa-019113.html","https://cert-portal.siemens.com/productcert/html/ssa-457936.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:09:56.034Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/68xxx/CVE-2025-68363.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-68363","state":"PUBLISHED","datePublished":"2025-12-24T10:32:51.236Z","dateUpdated":"2026-10-15T01:09:55.986Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-12-16T14:48:05.308Z"},"containers":{"cna":{"title":"bpf: Check skb->transport_header is set in bpf_skb_check_mtu","descriptions":[{"lang":"en","value":"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 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