CVE-2026-53011 (GCVE-0-2026-53011)
Vulnerability from cvelistv5
Published
2026-06-24 16:29
Modified
2026-08-05 12:32
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: a3d43c0d56f1b94e74963a2fbadfb70126d92213
Version: a3d43c0d56f1b94e74963a2fbadfb70126d92213
Version: a3d43c0d56f1b94e74963a2fbadfb70126d92213
Version: a3d43c0d56f1b94e74963a2fbadfb70126d92213
Version: a3d43c0d56f1b94e74963a2fbadfb70126d92213
Version: a3d43c0d56f1b94e74963a2fbadfb70126d92213
Version: a3d43c0d56f1b94e74963a2fbadfb70126d92213
Version: a3d43c0d56f1b94e74963a2fbadfb70126d92213
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sched/sch_taprio.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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          "product": "Linux",
          "programFiles": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "5.2"
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              "status": "unaffected",
              "version": "0",
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              "status": "unaffected",
              "version": "5.10.258",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.209",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.175",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "6.6.141",
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              "status": "unaffected",
              "version": "6.12.91",
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            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.33",
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              "version": "7.0.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "5.2",
                  "vulnerable": true
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                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "5.2",
                  "vulnerable": true
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable taprio schedule switch is reached through local `NETLINK_ROUTE`/tc qdisc configuration, not by unauthenticated network packets. An attacker sends `RTM_NEWQDISC` messages to install and later switch taprio schedules.\nAC:L - The trigger is deterministic once the attacker installs an oper schedule and a later admin schedule with chosen base times/intervals. The attacker controls the schedule timing, so no condition beyond attacker control is required.\nPR:L - The rtnetlink qdisc path requires `CAP_NET_ADMIN` in the target network namespace. Because tc/qdisc configuration is reachable with namespaced `CAP_NET_ADMIN` via user namespaces in reasonable deployments, this is low privilege rather than high privilege.\nUI:N - No victim action is required after the attacker can issue the local netlink configuration. The hrtimer-driven schedule transition occurs automatically.\nS:U - The vulnerability corrupts kernel memory within the same kernel security authority. It is a standard local kernel privilege-escalation/DoS class issue, not a VM or hardware boundary escape.\nC:H - This is a use-after-free of taprio schedule entry memory that leaves `current_entry` pointing into freed objects. As a kernel UAF, it can plausibly be shaped into memory disclosure primitives.\nI:H - The stale schedule entry is later written and used by scheduler/dequeue paths, giving attacker-influenced heap corruption potential. Under the required kernel guidance, a UAF is high integrity impact because it can be leveraged for arbitrary write or control-flow compromise.\nA:H - The dangling schedule entry can be dereferenced after RCU freeing by the timer or dequeue path. Even without full exploitation, this can cause kernel oops, panic, or repeated crashes."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:32:38.643Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a8fc396519ef4f081bc545e88f61241728bb78d7"
        },
        {
          "url": "https://git.kernel.org/stable/c/3471874578160a28c171a607fa069f24062634b8"
        },
        {
          "url": "https://git.kernel.org/stable/c/7256996e1ef553716817f3bfd077c2f3b48b582f"
        },
        {
          "url": "https://git.kernel.org/stable/c/eee072fe16c646190d33ae69c9983d8de1562bf8"
        },
        {
          "url": "https://git.kernel.org/stable/c/1bd286fa3e21200133478ed523cc6a2788baf38a"
        },
        {
          "url": "https://git.kernel.org/stable/c/b73235da5dde77ed1264f9767b62c28c9d71fd78"
        },
        {
          "url": "https://git.kernel.org/stable/c/0e62171df8ed4804d00db088f17eed06468233fa"
        },
        {
          "url": "https://git.kernel.org/stable/c/105425b1969c5affe532713cfac1c0b320d7ac2b"
        }
      ],
      "title": "net/sched: taprio: fix use-after-free in advance_sched() on schedule switch",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53011",
    "datePublished": "2026-06-24T16:29:22.082Z",
    "dateReserved": "2026-06-09T07:44:35.378Z",
    "dateUpdated": "2026-08-05T12:32:38.643Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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