CVE-2025-68200

Summary

In the Linux kernel, the following vulnerability has been resolved:

bpf: Add bpf_prog_run_data_pointers()

syzbot found that cls_bpf_classify() is able to change tc_skb_cb(skb)->drop_reason triggering a warning in sk_skb_reason_drop().

WARNING: CPU: 0 PID: 5965 at net/core/skbuff.c:1192 __sk_skb_reason_drop net/core/skbuff.c:1189 [inline] WARNING: CPU: 0 PID: 5965 at net/core/skbuff.c:1192 sk_skb_reason_drop+0x76/0x170 net/core/skbuff.c:1214

struct tc_skb_cb has been added in commit ec624fe740b4 ("net/sched: Extend qdisc control block with tc control block"), which added a wrong interaction with db58ba459202 ("bpf: wire in data and data_end for cls_act_bpf").

drop_reason was added later.

Add bpf_prog_run_data_pointers() helper to save/restore the net_sched storage colliding with BPF data_meta/data_end.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux0d76daf2013ce1da20eab5e26bd81d983e1c18fb < c4cdd143c35974a2cedd000fa9eb3accc3023b20affected
LinuxLinuxec624fe740b416fb68d536b37fb8eef46f90b5c2 < 5e149d8a8e732126fb6014efd60075cf63a73f91affected
LinuxLinuxec624fe740b416fb68d536b37fb8eef46f90b5c2 < baa61dcaa50b7141048c8d2aede7fe9ed8f21d11affected
LinuxLinuxec624fe740b416fb68d536b37fb8eef46f90b5c2 < 6392e5f4b1a3cce10e828309baf35d22abd3457daffected
LinuxLinuxec624fe740b416fb68d536b37fb8eef46f90b5c2 < 8dd2fe5f5d586c8e87307b7a271f6b994afcc006affected
LinuxLinuxec624fe740b416fb68d536b37fb8eef46f90b5c2 < 4ef92743625818932b9c320152b58274c05e5053affected
LinuxLinux5.15.13 < 5.15.197affected
LinuxLinux5.16affected
LinuxLinux0 < 5.16unaffected
LinuxLinux5.15.197 <= 5.15.*unaffected
LinuxLinux6.1.159 <= 6.1.*unaffected
LinuxLinux6.6.117 <= 6.6.*unaffected
LinuxLinux6.12.59 <= 6.12.*unaffected
LinuxLinux6.17.9 <= 6.17.*unaffected
LinuxLinux6.18 <= *unaffected

Weaknesses

References