bpf: Check skb->transport_header is set in bpf_skb_check_mtu
Summary
| CVE | CVE-2025-68363 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2025-12-24 11:15:59 UTC |
| Updated | 2026-07-14 13:17:58 UTC |
| Description | 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: bpf_skb_check_mtu(skb, ifindex, &mtu_len, 0, BPF_MTU_CHK_SEGS) The transport_header is not always set. There is a WARN_ON_ONCE report when CONFIG_DEBUG_NET is enabled + skb->gso_size is set + bpf_prog_test_run is used: WARNING: CPU: 1 PID: 2216 at ./include/linux/skbuff.h:3071 skb_gso_validate_network_len bpf_skb_check_mtu bpf_prog_3920e25740a41171_tc_chk_segs_flag # A test in the next patch bpf_test_run bpf_prog_test_run_skb For a normal ingress skb (not test_run), skb_reset_transport_header is performed but there is plan to avoid setting it as described in commit 2170a1f09148 ("net: no longer reset transport_header in __netif_receive_skb_core()"). This patch fixes the bpf helper by checking skb_transport_header_was_set(). The check is done just before skb->transport_header is used, to avoid breaking the existing bpf prog. The WARN_ON_ONCE is limited to bpf_prog_test_run, so targeting bpf-next. |
Risk And Classification
EPSS: 0.001730000 probability, percentile 0.069480000 (date 2026-07-14)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 34b2021cc61642d61c3cf943d9e71925b827941b b3171a5e4622e915e94599a55f4964078bdec27e git | Not specified |
| CNA | Linux | Linux | affected 34b2021cc61642d61c3cf943d9e71925b827941b 97b876fa88322625228792cf7a5fd77531815a80 git | Not specified |
| CNA | Linux | Linux | affected 34b2021cc61642d61c3cf943d9e71925b827941b 30ce906557a21adef4cba5901c8e995dc18263a9 git | Not specified |
| CNA | Linux | Linux | affected 34b2021cc61642d61c3cf943d9e71925b827941b 1c30e4afc5507f0069cc09bd561e510e4d97fbf7 git | Not specified |
| CNA | Linux | Linux | affected 34b2021cc61642d61c3cf943d9e71925b827941b 942268e2726ac7f16e3ec49dbfbbbe7cf5af9da5 git | Not specified |
| CNA | Linux | Linux | affected 34b2021cc61642d61c3cf943d9e71925b827941b d946f3c98328171fa50ddb908593cf833587f725 git | Not specified |
| CNA | Linux | Linux | affected 5.12 | Not specified |
| CNA | Linux | Linux | unaffected 5.12 semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.160 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.120 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.63 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.17.13 6.17.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.2 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.19 * original_commit_for_fix | Not specified |
| ADP | Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | affected V3.1.6 * custom | Not specified |
| ADP | Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | affected V3.1.6 * custom | Not specified |
| ADP | Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | affected V3.1.6 * custom | Not specified |
| ADP | Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | affected V3.1.6 * custom | Not specified |
| ADP | Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP | affected V3.1.6 * custom | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| cert-portal.siemens.com/productcert/html/ssa-019113.html | 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e | cert-portal.siemens.com | |
| git.kernel.org/stable/c/30ce906557a21adef4cba5901c8e995dc18263a9 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/97b876fa88322625228792cf7a5fd77531815a80 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/942268e2726ac7f16e3ec49dbfbbbe7cf5af9da5 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/1c30e4afc5507f0069cc09bd561e510e4d97fbf7 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/d946f3c98328171fa50ddb908593cf833587f725 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/b3171a5e4622e915e94599a55f4964078bdec27e | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.