{"cve":"CVE-2022-50253","nvd":{"published":"2025-09-15T14:15:36.007","modified":"2026-06-17T05:23:04.913","status":"Analyzed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: make sure skb->len != 0 when redirecting to a tunneling device\n\nsyzkaller managed to trigger another case where skb->len == 0\nwhen we enter __dev_queue_xmit:\n\nWARNING: CPU: 0 PID: 2470 at include/linux/skbuff.h:2576 skb_assert_len include/linux/skbuff.h:2576 [inline]\nWARNING: CPU: 0 PID: 2470 at include/linux/skbuff.h:2576 __dev_queue_xmit+0x2069/0x35e0 net/core/dev.c:4295\n\nCall Trace:\n dev_queue_xmit+0x17/0x20 net/core/dev.c:4406\n __bpf_tx_skb net/core/filter.c:2115 [inline]\n __bpf_redirect_no_mac net/core/filter.c:2140 [inline]\n __bpf_redirect+0x5fb/0xda0 net/core/filter.c:2163\n ____bpf_clone_redirect net/core/filter.c:2447 [inline]\n bpf_clone_redirect+0x247/0x390 net/core/filter.c:2419\n bpf_prog_48159a89cb4a9a16+0x59/0x5e\n bpf_dispatcher_nop_func include/linux/bpf.h:897 [inline]\n __bpf_prog_run include/linux/filter.h:596 [inline]\n bpf_prog_run include/linux/filter.h:603 [inline]\n bpf_test_run+0x46c/0x890 net/bpf/test_run.c:402\n bpf_prog_test_run_skb+0xbdc/0x14c0 net/bpf/test_run.c:1170\n bpf_prog_test_run+0x345/0x3c0 kernel/bpf/syscall.c:3648\n __sys_bpf+0x43a/0x6c0 kernel/bpf/syscall.c:5005\n __do_sys_bpf kernel/bpf/syscall.c:5091 [inline]\n __se_sys_bpf kernel/bpf/syscall.c:5089 [inline]\n __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5089\n do_syscall_64+0x54/0x70 arch/x86/entry/common.c:48\n entry_SYSCALL_64_after_hwframe+0x61/0xc6\n\nThe reproducer doesn't really reproduce outside of syzkaller\nenvironment, so I'm taking a guess here. It looks like we\ndo generate correct ETH_HLEN-sized packet, but we redirect\nthe packet to the tunneling device. Before we do so, we\n__skb_pull l2 header and arrive again at skb->len == 0.\nDoesn't seem like we can do anything better than having\nan explicit check after __skb_pull?","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":[],"references":["https://git.kernel.org/stable/c/07ec7b502800ba9f7b8b15cb01dd6556bb41aaca","https://git.kernel.org/stable/c/1b65704b8c08ae92db29f720d3b298031131da53","https://git.kernel.org/stable/c/5d3f4478d22b2cb1810f6fe0f797411e9d87b3e5","https://git.kernel.org/stable/c/6d935a02658be82585ecb39aab339faa84496650","https://git.kernel.org/stable/c/772431f30ca040cfbf31b791d468bac6a9ca74d3"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:08:41.295252406+00:00"},"epss":{"cve":"CVE-2022-50253","score":0.0016,"percentile":0.05105,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}