{"cve":"CVE-2026-64207","nvd":{"published":"2026-07-20T17:18:22.733","modified":"2026-08-17T05:17:22.437","status":"Analyzed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: dualpi2: fix GSO backlog accounting\n\nWhen DualPI2 splits a GSO skb into N segments, it propagates N\nadditional packets to its parent before returning NET_XMIT_SUCCESS.\nThe parent then accounts for the original skb once more, leaving its\nqlen one larger than the number of packets actually queued.\n\nWith QFQ as the parent, after all real packets are dequeued, QFQ still\nhas a non-zero qlen while its in-service aggregate has no active\nclasses. qfq_choose_next_agg() returns NULL and qfq_dequeue() passes\nthe result to qfq_peek_skb(), causing a NULL pointer dereference.\n\nFollow the same pattern used by tbf_segment() and taprio: count only\nsuccessfully queued segments, propagate the difference between the\noriginal skb and those segments, and return NET_XMIT_SUCCESS whenever\nat least one segment was queued.","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":["CWE-476"],"references":["https://git.kernel.org/stable/c/05ed733b65ab977dd931e7f7ac0f62fdb81205c2","https://git.kernel.org/stable/c/806586e33891066487db1f002be3d455cda6b516","https://git.kernel.org/stable/c/c4b70c1512b8f9f33f23c2c8196dfd1210207681"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:45:36.895656543+00:00"},"epss":{"cve":"CVE-2026-64207","score":0.0016,"percentile":0.05159,"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."]}