{"id":"CVE-2025-68363","url":"https://www.cyber-defence.io/tools/cve/CVE-2025-68363","generatedAt":"2026-10-28T04:46:45.556Z","title":"In the Linux kernel, the following vulnerability has been resolved: bpf: Check skb->transport_header is set in bpf_skb_check_mtu The bpf_skb_check_mtu helper needs to use skb->transport_header when the BPF_MTU_CHK_SEGS flag is used:…","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.","published":"2025-12-24T11:16:00.000Z","lastModified":"2026-10-15T02:18:12.000Z","status":"Deferred","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","cvss":null,"cwe":[],"affected":[],"epss":{"score":0.00212,"percentile":0.11443,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"unknown","text":"Not yet scored. NVD analysis is pending; check back once CVSS and EPSS values are published."},"changes":[],"references":[{"url":"https://git.kernel.org/stable/c/1c30e4afc5507f0069cc09bd561e510e4d97fbf7","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/30ce906557a21adef4cba5901c8e995dc18263a9","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/942268e2726ac7f16e3ec49dbfbbbe7cf5af9da5","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/97b876fa88322625228792cf7a5fd77531815a80","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b3171a5e4622e915e94599a55f4964078bdec27e","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d946f3c98328171fa50ddb908593cf833587f725","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-019113.html","source":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-457936.html","source":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2025-68363","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}