GHSA-G35R-7CV7-8X5X

Vulnerability from github – Published: 2026-06-24 18:32 – Updated: 2026-06-28 09:31
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

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

In advance_sched(), when should_change_schedules() returns true, switch_schedules() is called to promote the admin schedule to oper. switch_schedules() queues the old oper schedule for RCU freeing via call_rcu(), but 'next' still points into an entry of the old oper schedule. The subsequent 'next->end_time = end_time' and rcu_assign_pointer(q->current_entry, next) are use-after-free.

Fix this by selecting 'next' from the new oper schedule immediately after switch_schedules(), and using its pre-calculated end_time. setup_first_end_time() sets the first entry's end_time to base_time + interval when the schedule is installed, so the value is already correct.

The deleted 'end_time = sched_base_time(admin)' assignment was also harmful independently: it would overwrite the new first entry's pre-calculated end_time with just base_time.

Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-53011"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-24T17:17:12Z",
    "severity": "HIGH"
  },
  "details": "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 \u0027next\u0027 still points into an entry of the old oper\nschedule. The subsequent \u0027next-\u003eend_time = end_time\u0027 and\nrcu_assign_pointer(q-\u003ecurrent_entry, next) are use-after-free.\n\nFix this by selecting \u0027next\u0027 from the new oper schedule immediately\nafter switch_schedules(), and using its pre-calculated end_time.\nsetup_first_end_time() sets the first entry\u0027s end_time to\nbase_time + interval when the schedule is installed, so the value\nis already correct.\n\nThe deleted \u0027end_time = sched_base_time(admin)\u0027 assignment was also\nharmful independently: it would overwrite the new first entry\u0027s\npre-calculated end_time with just base_time.",
  "id": "GHSA-g35r-7cv7-8x5x",
  "modified": "2026-06-28T09:31:38Z",
  "published": "2026-06-24T18:32:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53011"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0e62171df8ed4804d00db088f17eed06468233fa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/105425b1969c5affe532713cfac1c0b320d7ac2b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1bd286fa3e21200133478ed523cc6a2788baf38a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3471874578160a28c171a607fa069f24062634b8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7256996e1ef553716817f3bfd077c2f3b48b582f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a8fc396519ef4f081bc545e88f61241728bb78d7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b73235da5dde77ed1264f9767b62c28c9d71fd78"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eee072fe16c646190d33ae69c9983d8de1562bf8"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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