CVE-2025-68363None▾ SunlitIn 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: …
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 8.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
0.2% → 0.2%
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.
Linux >= 34b2021cc61642d61c3cf943d9e71925b827941b < b3171a5e4622e915e94599a55f4964078bdec27eLinux >= 34b2021cc61642d61c3cf943d9e71925b827941b < 97b876fa88322625228792cf7a5fd77531815a80Linux >= 34b2021cc61642d61c3cf943d9e71925b827941b < 30ce906557a21adef4cba5901c8e995dc18263a9Linux >= 34b2021cc61642d61c3cf943d9e71925b827941b < 1c30e4afc5507f0069cc09bd561e510e4d97fbf7Linux >= 34b2021cc61642d61c3cf943d9e71925b827941b < 942268e2726ac7f16e3ec49dbfbbbe7cf5af9da5Linux >= 34b2021cc61642d61c3cf943d9e71925b827941b < d946f3c98328171fa50ddb908593cf833587f725Linux 5.12Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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