{"id":"CVE-2026-72036","revision":"2842638c19da40b3b107c7504397f8c3","records":[{"revision":"2842638c19da40b3b107c7504397f8c3","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-72036","aliases":[],"title":"net/sched: sch_multiq: Replace direct dequeue call with peek and qdisc_dequeue_peeked","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: sch_multiq: Replace direct dequeue call with peek and qdisc_dequeue_peeked\n\nmultiq_dequeue() takes a packet from a band's child with a direct\n->dequeue() call after multiq_peek() peeked it. When the child is\nnon-work-conserving the peek stashes the skb in the child's gso_skb, so\nthe direct dequeue returns a different skb and orphans the stash,\ndesyncing the child's qlen/backlog. With a qfq child reached through a\npeeking parent (e.g. tbf) this re-enters the child on an emptied list and\ndereferences NULL, panicking the kernel from softirq on ordinary egress.\n\nTake the packet through qdisc_dequeue_peeked(), as sch_prio already does\nand as sch_red and sch_sfb were just fixed to do. The helper is a no-op\nwhen the child has no stash, so a work-conserving child is unaffected.","state":0,"publishedAt":"2026-08-15T05:51:57.012+00:00","modifiedAt":"2026-10-19T21:19:24.167+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/sched/sch_multiq.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"77be155cba4e163e8bba9fd27222a8b6189ec4f7\",\n                            \"lessThan\": \"3e5fd9d14f2d228e7260251f2e4a1d41ba8f705a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"77be155cba4e163e8bba9fd27222a8b6189ec4f7\",\n                            \"lessThan\": \"eb1a9637f0bd84b5db8803af65dfb1f44785406f\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"77be155cba4e163e8bba9fd27222a8b6189ec4f7\",\n                            \"lessThan\": \"7a5a1582710981ef6637de9f074a60a5b1d63222\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"77be155cba4e163e8bba9fd27222a8b6189ec4f7\",\n                            \"lessThan\": \"86a61e46a1919e8abf4d227c204773dabb24068a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"77be155cba4e163e8bba9fd27222a8b6189ec4f7\",\n                            \"lessThan\": \"1b9cc255e8089606b92b2adf504e334573682821\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"77be155cba4e163e8bba9fd27222a8b6189ec4f7\",\n                            \"lessThan\": \"5889064919a1e5c0a9469c54895000414fc46944\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"77be155cba4e163e8bba9fd27222a8b6189ec4f7\",\n                            \"lessThan\": \"fffeb2ab5eeb823d4c2330571a098f63237c9049\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"77be155cba4e163e8bba9fd27222a8b6189ec4f7\",\n                            \"lessThan\": \"54f6b0c843e228d499eb4b6bbb89df68cad9ad5d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/sched/sch_multiq.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2.6.29\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"2.6.29\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.261\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.212\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.178\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.145\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.97\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.40\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.5\",\n                            \"lessThanOrEqual\": \"7.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/3e5fd9d14f2d228e7260251f2e4a1d41ba8f705a","https://git.kernel.org/stable/c/eb1a9637f0bd84b5db8803af65dfb1f44785406f","https://git.kernel.org/stable/c/7a5a1582710981ef6637de9f074a60a5b1d63222","https://git.kernel.org/stable/c/86a61e46a1919e8abf4d227c204773dabb24068a","https://git.kernel.org/stable/c/1b9cc255e8089606b92b2adf504e334573682821","https://git.kernel.org/stable/c/5889064919a1e5c0a9469c54895000414fc46944","https://git.kernel.org/stable/c/fffeb2ab5eeb823d4c2330571a098f63237c9049","https://git.kernel.org/stable/c/54f6b0c843e228d499eb4b6bbb89df68cad9ad5d"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-72036","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-72036","identifiers":["CVE-2026-72036"]},"retained":false,"historicalAffected":[]}],"coverage":[]}