Answer in brief
CVE-2025-68363 records a Unknown severity vulnerability in bpf: Check skb->transport_header is set in bpf_skb_check_mtu. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2025-68363 records a Unknown severity vulnerability in bpf: Check skb->transport_header is set in bpf_skb_check_mtu. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=34b2021cc61642d61c3cf943d9e71925b827941b <b3171a5e4622e915e94599a55f4964078bdec27e || >=34b2021cc61642d61c3cf943d9e71925b827941b <97b876fa88322625228792cf7a5fd77531815a80 || >=34b2021cc61642d61c3cf943d9e71925b827941b <30ce906557a21adef4cba5901c8e995dc18263a9 || >=34b2021cc61642d61c3cf943d9e71925b827941b <1c30e4afc5507f0069cc09bd561e510e4d97fbf7 || >=34b2021cc61642d61c3cf943d9e71925b827941b <942268e2726ac7f16e3ec49dbfbbbe7cf5af9da5 || >=34b2021cc61642d61c3cf943d9e71925b827941b <d946f3c98328171fa50ddb908593cf833587f725 | b3171a5e4622e915e94599a55f4964078bdec27e, 97b876fa88322625228792cf7a5fd77531815a80, 30ce906557a21adef4cba5901c8e995dc18263a9, 1c30e4afc5507f0069cc09bd561e510e4d97fbf7, 942268e2726ac7f16e3ec49dbfbbbe7cf5af9da5, d946f3c98328171fa50ddb908593cf833587f725 |
| Linux/Linuxgeneric | 5.12 | Not reported |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
Published upstream
Dec 24, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 14, 2026
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.
Quoted source text, attributed separately from HOL analysis.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=34b2021cc61642d61c3cf943d9e71925b827941b <b3171a5e4622e915e94599a55f4964078bdec27e || >=34b2021cc61642d61c3cf943d9e71925b827941b <97b876fa88322625228792cf7a5fd77531815a80 || >=34b2021cc61642d61c3cf943d9e71925b827941b <30ce906557a21adef4cba5901c8e995dc18263a9 || >=34b2021cc61642d61c3cf943d9e71925b827941b <1c30e4afc5507f0069cc09bd561e510e4d97fbf7 || >=34b2021cc61642d61c3cf943d9e71925b827941b <942268e2726ac7f16e3ec49dbfbbbe7cf5af9da5 || >=34b2021cc61642d61c3cf943d9e71925b827941b <d946f3c98328171fa50ddb908593cf833587f725 | b3171a5e4622e915e94599a55f4964078bdec27e, 97b876fa88322625228792cf7a5fd77531815a80, 30ce906557a21adef4cba5901c8e995dc18263a9, 1c30e4afc5507f0069cc09bd561e510e4d97fbf7, 942268e2726ac7f16e3ec49dbfbbbe7cf5af9da5, d946f3c98328171fa50ddb908593cf833587f725 |
| Linux/Linuxgeneric | 5.12 | Not reported |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
Published upstream
Dec 24, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 14, 2026
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.
Quoted source text, attributed separately from HOL analysis.