{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-89647",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-89647"
  ],
  "published": "2026-09-11T19:47:07Z",
  "summary": "ceph: do not repeat ceph_trim_dentries() if no progress possible",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nceph: do not repeat ceph_trim_dentries() if no progress possible\n\nceph_cap_reclaim_work() re-queues itself for as long as\nceph_trim_dentries() returns -EAGAIN, which happens whenever a lease\nwalk exhausts its `nr_to_scan` budget.  This creates a busy loop that\nconsumes CPU without making any progress when there is nothing to\nreclaim: with no cap pressure (`count==0`) and every scanned lease\nstill valid, each pass runs the full scan budget down to zero and\nreturns `-EAGAIN`, only to be queued again immediately.\n\nThe dir-lease walk made this worse.  When `expire_dir_lease` is\n`false` (i.e. we have no intention of reclaiming dir leases),\n__dir_lease_check() returned `TOUCH` for every valid lease.  `TOUCH`\nmoves the dentry to the tail of the list and resets `di->time` via\n__dentry_dir_lease_touch(), so a walk over N valid leases pointlessly\nrewrote the list, refreshed the timestamps (preventing them from ever\naging out) and always drained `nr_to_scan`, guaranteeing the `-EAGAIN`\nrequeue.\n\nFix this in three steps:\n\n - Return `KEEP` instead of `TOUCH` when `expire_dir_lease` is\n   `false`.  If we are not going to reclaim the lease, leave it in\n   place instead of churning the list and resetting its timestamp; the\n   walk then terminates naturally (or via `STOP` at the first fresh\n   lease).\n\n - Only return `-EAGAIN` from the first (dentry-lease) walk when something\n   was actually freed.  A full batch that frees nothing means retrying\n   the same list immediately is futile; fall through to the dir-lease\n   walk instead.\n\n - After both walks, bail out with success (0) when nothing was freed\n   and there is no cap pressure (`count==0`).  There is no reason to\n   keep retrying when we are not over the cap limit and made no\n   progress.\n\nUnder real cap pressure (`count>0`) the reclaim path is unchanged and\nstill retries via `-EAGAIN`.\n\nWithout this patch, I saw 500 ceph_trim_dentries() calls per second on\nour web servers.  This is very visible in `/proc/lock_stat` (5 minute\ncapture):\n\n              class name    con-bounces    contentions   waittime-min   waittime-max waittime-total   waittime-avg    acq-bounces   acquisitions   holdtime-min   holdtime-max holdtime-total   holdtime-avg\n\n &mdsc->dentry_list_lock:        126180         128218           0.04        8063.44    15986965.20         124.69        1573354        5296812           0.04        8291.28    74164526.48          14.00\n -----------------------\n &mdsc->dentry_list_lock         111736          [<000000007b11e319>] __ceph_dentry_dir_lease_touch+0x7c/0xa8\n &mdsc->dentry_list_lock           2631          [<0000000050597999>] __dentry_leases_walk+0x64/0x2c8\n &mdsc->dentry_list_lock           3878          [<00000000c0022f62>] __ceph_dentry_lease_touch+0x5c/0xa8\n &mdsc->dentry_list_lock           9973          [<000000002f27cb6f>] __dentry_lease_unlist+0x50/0xa0\n -----------------------\n &mdsc->dentry_list_lock         123621          [<0000000050597999>] __dentry_leases_walk+0x64/0x2c8\n &mdsc->dentry_list_lock           1822          [<000000007b11e319>] __ceph_dentry_dir_lease_touch+0x7c/0xa8\n &mdsc->dentry_list_lock           2720          [<000000002f27cb6f>] __dentry_lease_unlist+0x50/0xa0\n &mdsc->dentry_list_lock             55          [<00000000c0022f62>] __ceph_dentry_lease_touch+0x5c/0xa8\n\nWith this patch:\n\n              class name    con-bounces    contentions   waittime-min   waittime-max waittime-total   waittime-avg    acq-bounces   acquisitions   holdtime-min   holdtime-max holdtime-total   holdtime-avg\n\n &mdsc->dentry_list_lock:          1203           1215           0.16         408.88       33082.88          27.23        4320501        7357389           0.04         500.64     1961578.00           0.27\n -----------------------\n &mdsc->dentry_list_lock           1029          [<000000003c9aea8a>] __ceph_dentry_dir_lease_touch+0x7c/0xa8\n &mdsc->dentry_list_lock            1\n---truncated---",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
    }
  ],
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-89647"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5a541eb401acb89d791da41189d7a79220164b93"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/37d6edb2f03b29399a3a337fae78674de51e1695"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3d122b2feb1dd76bb5041bdea5e1e1b007d8d415"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e7d7aa7b730178278109c41fa1b17b06873065d5"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-13T06:49:25Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.5,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - fs/ceph registers ceph_export_ops, so remote nfsd/ksmbd readdir and lookup on an exported CephFS mount populate dentry and dir-lease lists and drive ceph_trim_dentries() via the cap-reclaim workqueue; a compromised MDS on the existing client TCP session can also keep those leases valid.\nAC:L - Default caps_max leaves count==0, so expire_dir_lease is false and valid dir leases are TOUCHed until nr_to_scan hits zero; ceph_cap_reclaim_work() then immediately requeues on -EAGAIN. An attacker who walks or creates many dentries, or a peer that grants many still-valid leases, triggers this deterministically with no race.\nPR:N - In the network-export scenario the attacker needs no local account or capability on the victim host; guest or anonymous NFS/SMB exports of CephFS, and a remote MDS peer on an already-connected kernel client, are reasonable high-severity deployments matching other Ceph client CVEs.\nUI:N - After CephFS is mounted and optionally exported, delayed_work periodically queues reclaim and the attacker\u2019s own readdir/lookup or MDS lease traffic is enough; no separate victim mount, open, or confirmation is required at exploit time.\nS:U - The busy loop, CPU burn, and dentry_list_lock contention stay inside the host kernel CephFS client and do not cross a VM, IOMMU, or sandbox boundary to another security authority.\nC:N - The defect only rescans and TOUCHes still-valid dentry leases; it does not perform an out-of-bounds read, use-after-free, or any other kernel-memory disclosure.\nI:N - The walk only reshuffles lease-list order and refreshes dentry timestamps; there is no memory corruption, arbitrary write, or control-flow hijack primitive.\nA:H - ceph_cap_reclaim_work() immediately requeues itself on -EAGAIN, forming an unbounded busy loop on the max_active=1 ceph-cap workqueue (observed ~500 iterations/s) that starves cap-release work, burns CPU, and contends dentry_list_lock enough to stall Ceph directory operations."
    }
  }
}