{"id":"CVE-2025-38108","summary":"net_sched: red: fix a race in __red_change()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: red: fix a race in __red_change()\n\nGerrard Tai reported a race condition in RED, whenever SFQ perturb timer\nfires at the wrong time.\n\nThe race is as follows:\n\nCPU 0                                 CPU 1\n[1]: lock root\n[2]: qdisc_tree_flush_backlog()\n[3]: unlock root\n |\n |                                    [5]: lock root\n |                                    [6]: rehash\n |                                    [7]: qdisc_tree_reduce_backlog()\n |\n[4]: qdisc_put()\n\nThis can be abused to underflow a parent's qlen.\n\nCalling qdisc_purge_queue() instead of qdisc_tree_flush_backlog()\nshould fix the race, because all packets will be purged from the qdisc\nbefore releasing the lock.","modified":"2026-04-16T04:32:33.815511587Z","published":"2025-07-03T08:35:18.523Z","related":["SUSE-SU-2025:02846-1","SUSE-SU-2025:02853-1","SUSE-SU-2025:02923-1","SUSE-SU-2025:02969-1","SUSE-SU-2025:02996-1","SUSE-SU-2025:02997-1","SUSE-SU-2025:03011-1","SUSE-SU-2025:03023-1","SUSE-SU-2025:20577-1","SUSE-SU-2025:20586-1","SUSE-SU-2025:20601-1","SUSE-SU-2025:20602-1","SUSE-SU-2025:21074-1","SUSE-SU-2025:21139-1","SUSE-SU-2025:21179-1","openSUSE-SU-2025:20081-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38108.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/110a47efcf23438ff8d31dbd9c854fae2a48bf98"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2790c4ec481be45a80948d059cd7c9a06bc37493"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2a71924ca4af59ffc00f0444732b6cd54b153d0e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/444ad445df5496a785705019268a8a84b84484bb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4b755305b2b0618e857fdadb499365b5f2e478d1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/85a3e0ede38450ea3053b8c45d28cf55208409b8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a1bf6a4e9264a685b0e642994031f9c5aad72414"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f569984417a4e12c67366e69bdcb752970de921d"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38108.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-38108"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0c8d13ac96070000da33f394f45e9c19638483c5"},{"fixed":"2790c4ec481be45a80948d059cd7c9a06bc37493"},{"fixed":"a1bf6a4e9264a685b0e642994031f9c5aad72414"},{"fixed":"110a47efcf23438ff8d31dbd9c854fae2a48bf98"},{"fixed":"f569984417a4e12c67366e69bdcb752970de921d"},{"fixed":"2a71924ca4af59ffc00f0444732b6cd54b153d0e"},{"fixed":"4b755305b2b0618e857fdadb499365b5f2e478d1"},{"fixed":"444ad445df5496a785705019268a8a84b84484bb"},{"fixed":"85a3e0ede38450ea3053b8c45d28cf55208409b8"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-38108.json"}}],"schema_version":"1.7.5"}