net/sched: taprio: fix use-after-free in advance_sched() on schedule switch_CVE-2026-53011

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: taprio: fix use-after-free in advance_sched() on schedule switch\n\nIn advance_sched(), when should_change_schedules() returns true,\nswitch_schedules() is called to promote the admin schedule to oper.\nswitch_schedules() queues the old oper schedule for RCU freeing via\ncall_rcu(), but 'next' still points into an entry of the old oper\nschedule. The subsequent 'next->end_time = end_time' and\nrcu_assign_pointer(q->current_entry, next) are use-after-free.\n\nFix this by selecting 'next' from the new oper schedule immediately\nafter switch_schedules(), and using its pre-calculated end_time.\nsetup_first_end_time() sets the first entry's end_time to\nbase_time + interval when the schedule is installed, so the value\nis already correct.\n\nThe deleted 'end_time = sched_base_time(admin)' assignment was also\nharmful independently: it would overwrite the new first entry's\npre-calculated end_time with just base_time.",
    "published": "2026-06-24T16:29:22.082Z",
    "modified": "2026-06-28T06:38:02.986Z",
    "type": "cve",
    "title": "net/sched: taprio: fix use-after-free in advance_sched() on schedule switch",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/a8fc396519ef4f081bc545e88f61241728bb78d7\nhttps://git.kernel.org/stable/c/3471874578160a28c171a607fa069f24062634b8\nhttps://git.kernel.org/stable/c/7256996e1ef553716817f3bfd077c2f3b48b582f\nhttps://git.kernel.org/stable/c/eee072fe16c646190d33ae69c9983d8de1562bf8\nhttps://git.kernel.org/stable/c/1bd286fa3e21200133478ed523cc6a2788baf38a\nhttps://git.kernel.org/stable/c/b73235da5dde77ed1264f9767b62c28c9d71fd78\nhttps://git.kernel.org/stable/c/0e62171df8ed4804d00db088f17eed06468233fa\nhttps://git.kernel.org/stable/c/105425b1969c5affe532713cfac1c0b320d7ac2b",
    "id": "CVE-2026-53011",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux a3d43c0d56f1b94e74963a2fbadfb70126d92213\nLinux Linux a3d43c0d56f1b94e74963a2fbadfb70126d92213\nLinux Linux a3d43c0d56f1b94e74963a2fbadfb70126d92213\nLinux Linux a3d43c0d56f1b94e74963a2fbadfb70126d92213\nLinux Linux a3d43c0d56f1b94e74963a2fbadfb70126d92213\nLinux Linux a3d43c0d56f1b94e74963a2fbadfb70126d92213\nLinux Linux a3d43c0d56f1b94e74963a2fbadfb70126d92213\nLinux Linux a3d43c0d56f1b94e74963a2fbadfb70126d92213\nLinux Linux 5.2",
    "sourceHref": "",
    "cvss": {
        "score": 7.8,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
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        "baseScore": 0,
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        "privilegesRequired": "",
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        "scope": "",
        "confidentialityImpact": "",
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        "availabilityImpact": "",
        "cvssV3": {
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            "baseScore": 0,
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "a3d43c0d56f1b94e74963a2fbadfb70126d92213",
    "vendor": "Linux",
    "ai_description": "",
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    "ai_score": 0
}