{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-68337", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.383Z", "datePublished": "2026-08-10T12:03:13.583Z", "dateUpdated": "2026-08-10T12:03:13.583Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-10T12:03:13.583Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reject redirect helpers without a bpf_net_context\n\nThe bpf_redirect*() helpers and skb_do_redirect() obtain the per-task\nbpf_redirect_info via bpf_net_ctx_get_ri(), which dereferences the\ncurrent->bpf_net_context unconditionally. That context is established\non the paths that run tc BPF such as sch_handle_{ingress,egress}(),\n*except* for the case where {cls,act}_bpf was attached to a proper\nqdisc. A program running from there reaches the NULL deref in two ways:\n\n* It calls bpf_redirect() directly, which dereferences the context at\n the top of the helper:\n\n tc qdisc add dev eth0 root handle 1: red limit 1MB min 10KB max 20KB \\\n avpkt 1000 burst 100 qevent early_drop block 10\n tc filter add block 10 pref 1 bpf obj redirect.o\n\n* It simply returns TC_ACT_REDIRECT without helper call: tcf_qevent_handle()\n then dispatches to skb_do_redirect(), which dereferences the context\n\nRather than extending bpf_net_context management into the qdisc path,\nmake the redirect helpers refuse to operate when no context exists, and\nhave tcf_qevent_handle() drop a TC_ACT_REDIRECT verdict instead of\ncalling skb_do_redirect(). Previous behaviour was a crash, so nothing\nregresses by not supporting it."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/core/filter.c", "net/sched/cls_api.c"], "versions": [{"version": "3625750f05ecce21a0fce429c1ff85acfffb461b", "lessThan": "cabfacbd5af09d3ae898ca224c4a1459e9bba15d", "status": "affected", "versionType": "git"}, {"version": "3625750f05ecce21a0fce429c1ff85acfffb461b", "lessThan": "3f4920d165b29052255527d8ae7619e7ec132ece", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/core/filter.c", "net/sched/cls_api.c"], "versions": [{"version": "5.9", "status": "affected"}, {"version": "0", "lessThan": "5.9", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.6", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2-rc5", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "7.1.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "7.2-rc5"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/cabfacbd5af09d3ae898ca224c4a1459e9bba15d"}, {"url": "https://git.kernel.org/stable/c/3f4920d165b29052255527d8ae7619e7ec132ece"}], "title": "bpf: Reject redirect helpers without a bpf_net_context", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"created": "2026-08-10T16:00:04.017158+00:00", "updated": "2026-08-10T16:00:04.017164+00:00", "vendors": [], "weaknesses": ["CWE-476"]}