{"cve":"CVE-2025-38477","nvd":{"published":"2025-07-28T12:15:29.617","modified":"2026-07-30T06:23:19.777","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: sch_qfq: Fix race condition on qfq_aggregate\n\nA race condition can occur when 'agg' is modified in qfq_change_agg\n(called during qfq_enqueue) while other threads access it\nconcurrently. For example, qfq_dump_class may trigger a NULL\ndereference, and qfq_delete_class may cause a use-after-free.\n\nThis patch addresses the issue by:\n\n1. Moved qfq_destroy_class into the critical section.\n\n2. Added sch_tree_lock protection to qfq_dump_class and\nqfq_dump_class_stats.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","score":4.7},"cwes":["CWE-362"],"references":["https://git.kernel.org/stable/c/466e10194ab81caa2ee6a332d33ba16bcceeeba6","https://git.kernel.org/stable/c/5e28d5a3f774f118896aec17a3a20a9c5c9dfc64","https://git.kernel.org/stable/c/a6d735100f602c830c16d69fb6d780eebd8c9ae1","https://git.kernel.org/stable/c/aa7a22c4d678bf649fd3a1d27debec583563414d","https://git.kernel.org/stable/c/c000a3a330d97f6c073ace5aa5faf94b9adb4b79"],"products":["debian:debian_linux","linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:05:46.678065081+00:00"},"epss":{"cve":"CVE-2025-38477","score":0.00141,"percentile":0.03433,"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."]}