{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2022-50253", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2022-50253", "idYear": 2022, "status": "PUBLISHED", "publishedAt": "2025-09-15T14:02:34.849Z", "updatedAt": "2026-05-11T19:15:44.305Z", "importedAt": "2026-10-24T01:56:49.724Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "bpf: make sure skb->len != 0 when redirecting to a tunneling device", "summary": "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?", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "4e3264d21b90984c2165e8fe5a7b64cf25bc2c2d", "status": "affected", "versionType": "git", "lessThan": "ffbccc5fb0a67424e12f7f8da210c04c8063f797" }, { "version": "4e3264d21b90984c2165e8fe5a7b64cf25bc2c2d", "status": "affected", "versionType": "git", "lessThan": "e6a63203e5a90a39392fa1a7ffc60f5e9baf642a" }, { "version": "4e3264d21b90984c2165e8fe5a7b64cf25bc2c2d", "status": "affected", "versionType": "git", "lessThan": "772431f30ca040cfbf31b791d468bac6a9ca74d3" }, { "version": "4e3264d21b90984c2165e8fe5a7b64cf25bc2c2d", "status": "affected", "versionType": "git", "lessThan": "6d935a02658be82585ecb39aab339faa84496650" }, { "version": "4e3264d21b90984c2165e8fe5a7b64cf25bc2c2d", "status": "affected", "versionType": "git", "lessThan": "5d3f4478d22b2cb1810f6fe0f797411e9d87b3e5" }, { "version": "4e3264d21b90984c2165e8fe5a7b64cf25bc2c2d", "status": "affected", "versionType": "git", "lessThan": "1b65704b8c08ae92db29f720d3b298031131da53" }, { "version": "4e3264d21b90984c2165e8fe5a7b64cf25bc2c2d", "status": "affected", "versionType": "git", "lessThan": "f186303845a01cc7e991f9dc51d7e5a3cdc7aedb" }, { "version": "4e3264d21b90984c2165e8fe5a7b64cf25bc2c2d", "status": "affected", "versionType": "git", "lessThan": "07ec7b502800ba9f7b8b15cb01dd6556bb41aaca" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "4.9", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "4.9" }, { "version": "4.14.303", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.14.*" }, { "version": "4.19.270", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.19.*" }, { "version": "5.4.229", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.4.*" }, { "version": "5.10.163", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.86", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.0.16", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.0.*" }, { "version": "6.1.2", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.2", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }