Description
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.
Metrics
No CVSS score has been published yet.
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 0d76daf2013ce1da20eab5e26bd81d983e1c18fb, < c4cdd143c35974a2cedd000fa9eb3accc3023b20; >= ec624fe740b416fb68d536b37fb8eef46f90b5c2, < 5e149d8a8e732126fb6014efd60075cf63a73f91; >= ec624fe740b416fb68d536b37fb8eef46f90b5c2, < baa61dcaa50b7141048c8d2aede7fe9ed8f21d11; >= ec624fe740b416fb68d536b37fb8eef46f90b5c2, < 6392e5f4b1a3cce10e828309baf35d22abd3457d; >= ec624fe740b416fb68d536b37fb8eef46f90b5c2, < 8dd2fe5f5d586c8e87307b7a271f6b994afcc006; >= ec624fe740b416fb68d536b37fb8eef46f90b5c2, < 4ef92743625818932b9c320152b58274c05e5053; >= 5.15.13, < 5.15.197 |
| Linux | Linux | 5.16 |
References
- https://git.kernel.org/stable/c/4ef92743625818932b9c320152b58274c05e5053
- https://git.kernel.org/stable/c/5e149d8a8e732126fb6014efd60075cf63a73f91
- https://git.kernel.org/stable/c/6392e5f4b1a3cce10e828309baf35d22abd3457d
- https://git.kernel.org/stable/c/8dd2fe5f5d586c8e87307b7a271f6b994afcc006
- https://git.kernel.org/stable/c/baa61dcaa50b7141048c8d2aede7fe9ed8f21d11
- https://git.kernel.org/stable/c/c4cdd143c35974a2cedd000fa9eb3accc3023b20
Timeline
- Published
- Dec 16, 2025
- Last modified
- Oct 14, 2026
- NVD status
- Deferred