mm/vmscan: report RCU-tasks quiescent states in shrink_lruvec()

{
  "id": "fc379cf5dbf57bb4325fde9a35cb25444fedebae9ab6a5c9f35e996fbed74d4c",
  "url": "https://osv.dev/vulnerability/CVE-2026-89753",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "mm/vmscan: report RCU-tasks quiescent states in shrink_lruvec()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: mm/vmscan: report RCU-tasks quiescent states in shrink_lruvec() I am seeing some rcu_tasks stalls in the Meta fleet during reclaim. INFO: rcu_tasks detected stalls on tasks: 0000000088620d09: .. nvcsw: 6735/6735 holdout: 1 idle_cpu: -1/8 task:GlobalCPUThread state:R running task pid:2552016 tgid:2524552 Call Trace: shrink_lruvec mem_cgroup_iter shrink_node do_try_to_free_pages try_to_free_pages __alloc_frozen_pages_noprof alloc_pages_noprof pte_alloc_one __pte_alloc handle_mm_fault Nothing promises direct reclaim returns in bounded time, and the scan loop in shrink_lruvec() only calls cond_resched(), which is a no-op on PREEMPTION kernels. Involuntary preemption is not a Tasks-RCU quiescent state, so the reclaiming task never reports one and becomes a holdout. Upgrade it to cond_resched_tasks_rcu_qs(), which reports a quiescent state even when cond_resched() does nothing. PS: This has been discussed in [1]",
    "evidence": "osv:CVE-2026-89753",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "evidence": "/affected/1/ranges"
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            "value": "5.15.221",
            "evidence": "/affected/1/ranges"
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            "value": "6.1.188",
            "evidence": "/affected/1/ranges"
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            "value": "6.6.157",
            "evidence": "/affected/1/ranges"
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            "value": "6.12.109",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.50",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-89753",
      "aliases": [
        "CVE-2026-89753"
      ],
      "affected": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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                {
                  "fixed": "4cdc1bdf40944de5c6b118fef07ad23f07844338"
                },
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                  "fixed": "a67a00a70a7c8309ca47ea157ef3e8ed3d268f5b"
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                  "fixed": "029c9408049f7f582230322057b7075bea594fd5"
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                  "fixed": "b5391676c61d94ffe3272dcf6723738b802f79e8"
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                {
                  "fixed": "3fd50239986302cb050d3649351bcec00fa9d5ab"
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              "type": "ECOSYSTEM",
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                  "introduced": "3.18.0"
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                {
                  "fixed": "5.10.270"
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              "type": "ECOSYSTEM",
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                  "introduced": "5.11.0"
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
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      ],
      "modified": "2026-10-28T02:30:49.871615089Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/029c9408049f7f582230322057b7075bea594fd5",
        "https://git.kernel.org/stable/c/25f52e81216884a7444bf07a606691feb09a94e3",
        "https://git.kernel.org/stable/c/3fd50239986302cb050d3649351bcec00fa9d5ab",
        "https://git.kernel.org/stable/c/4cdc1bdf40944de5c6b118fef07ad23f07844338",
        "https://git.kernel.org/stable/c/4f50593c9cbc883d8c9b50148a3e8a8b1fd35f57",
        "https://git.kernel.org/stable/c/a67a00a70a7c8309ca47ea157ef3e8ed3d268f5b",
        "https://git.kernel.org/stable/c/b5391676c61d94ffe3272dcf6723738b802f79e8",
        "https://git.kernel.org/stable/c/cf3ba0911a1cf8680371ff113b90088edd01d2bb",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89753.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-89753",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89753.json"
      }
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    "related_cves": [
      {
        "value": "CVE-2026-89753",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 518521,
  "published_at": "2026-09-11T19:46:56.806+00:00"
}