CVE-2025-68363

Description

In the Linux kernel, the following vulnerability has been resolved:bpf: Check skb->transport_header is set in bpf_skb_check_mtuThe bpf_skb_check_mtu helper needs to use skb->transport_header whenthe 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_ONCEreport 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_skbFor a normal ingress skb (not test_run), skb_reset_transport_headeris performed but there is plan to avoid setting it as described incommit 2170a1f09148 (net: no longer reset transport_header in __netif_receive_skb_core()).This patch fixes the bpf helper by checkingskb_transport_header_was_set(). The check is done just beforeskb->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 Information

Base Score

5.5

MODERATE

Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Score

Exploitation Probability

0.053

Associated Vulnerability

No records found

Patch Details

No records found

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234