{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64142",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64142"
  ],
  "published": "2026-07-19T15:41:06Z",
  "summary": "ksmbd: close durable scavenger races against m_fp_list lookups",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: close durable scavenger races against m_fp_list lookups\n\nksmbd_durable_scavenger() has two related races against any walker\nthat iterates f_ci->m_fp_list, including ksmbd_lookup_fd_inode()\n(used by ksmbd_vfs_rename) and the share-mode checks in\nfs/smb/server/smb_common.c.\n\n(1) fp->node list-head reuse.  Durable-preserved handles can remain\nlinked on f_ci->m_fp_list after session teardown so share-mode checks\nstill see them while the handle is reconnectable.  The scavenger\ncollected expired handles by adding fp->node to a local\nscavenger_list after removing them from the global durable idr.\nBecause fp->node is the same list_head used by m_fp_list,\nlist_add(&fp->node, &scavenger_list) overwrites the m_fp_list links\nand corrupts both lists.  CONFIG_DEBUG_LIST can report this on the\nshare-mode walk path.\n\n(2) Refcount race against m_fp_list walkers.  The scavenger qualifies\nan expired durable handle with atomic_read(&fp->refcount) > 1 and\nfp->conn under global_ft.lock, removes fp from global_ft, then drops\nglobal_ft.lock before unlinking fp from m_fp_list and freeing it.\nDuring that gap fp is still linked on m_fp_list with f_state ==\nFP_INITED.  ksmbd_lookup_fd_inode() under m_lock read calls\nksmbd_fp_get() (atomic_inc_not_zero on refcount that is still 1) and\ntakes a live reference; the scavenger then unlinks and frees fp\nwhile the holder owns a reference, leading to UAF on the holder's\nsubsequent ksmbd_fd_put() and on any field reads performed by a\nconcurrent share-mode walker that iterates m_fp_list without taking\nksmbd_fp_get() (smb_check_perm_dleases-like paths).\n\nFix both:\n\n  * Stop reusing fp->node as a scavenger-private list node.  Remove\n    one expired handle from global_ft under global_ft.lock, take an\n    explicit transient reference, drop the lock, unlink fp->node\n    from m_fp_list under f_ci->m_lock, then drop both the durable\n    lifetime and transient references with atomic_sub_and_test(2,\n    &fp->refcount).  If the scavenger is the last putter the close\n    runs there; otherwise an in-flight holder that already raced\n    through the m_fp_list lookup owns the final close via its\n    ksmbd_fd_put() path.  The one-at-a-time disposal can rescan the\n    durable idr when multiple handles expire in the same pass, but\n    durable scavenging is a background expiration path and the final\n    full scan recomputes min_timeout before the next wait.\n\n  * Clear fp->persistent_id inside __ksmbd_remove_durable_fd() right\n    after idr_remove(), so a delayed final close from a holder that\n    snatched fp does not re-issue idr_remove() on a persistent id\n    that idr_alloc_cyclic() in ksmbd_open_durable_fd() may have\n    already handed out to a brand-new durable handle.\n\n  * Bypass the per-conn open_files_count decrement in\n    __put_fd_final() when fp is detached from any session table\n    (fp->conn cleared by session_fd_check() at durable preserve --\n    paired with the volatile_id clear at unpublish, so checking\n    fp->conn alone is sufficient).  The walker that owns the final\n    close runs from an unrelated work->conn whose\n    stats.open_files_count never tracked this durable fp; without\n    this guard the holder would underflow that unrelated counter.\n\nThe two races are folded into one patch because patch (1) alone\ncleans up the corrupted list but leaves a deterministic UAF window\nfor m_fp_list walkers that the transient-reference and\npersistent_id discipline in (2) close; bisecting onto an\nintermediate state would land on a UAF that pre-patch chaos merely\nmade less reproducible.\n\nValidation:\n  * CONFIG_DEBUG_LIST coverage for the list_head reuse path.\n  * KASAN-enabled direct SMB2 durable-handle coverage that exercised\n    ksmbd_durable_scavenger() and non-NULL ksmbd_lookup_fd_inode()\n    returns while durable handles expired under concurrent rename\n    lookups, with no KASAN, UAF, list-corruption, ODEBUG, or WARNING\n    reports.\n---truncated---",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-64142"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3a436932eb397e909d0607d76a8325abd9d85a35"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/95f072ef934ca00711d510676b8792cbf59a5aae"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5da69a65b282d2276de22e5194ba0f88c836170c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1f8f3246d55f89350a1a67bdf3744b7241048e4e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bf736184d063da1a552ffeff0481813599a182cc"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - The bug is in ksmbd, the in-kernel SMB server reachable over TCP port 445; exploitation is driven by remote SMB2 packets that set up durable handles, tear down sessions, and issue concurrent rename/open operations.\nAC:L - The attacker controls both sides of the race by opening a durable handle, logging off/disconnecting to enter durable-preserve state, waiting for the configured scavenger timeout, and flooding concurrent SMB2 rename or create requests timed to the scavenger expiration window.\nPR:N - Exploitation requires only network reachability to ksmbd and normal SMB session authentication (including guest/anonymous shares); no pre-existing OS privileges, capabilities, or local access are needed beyond share-level SMB access obtainable through the protocol itself.\nUI:N - No victim user interaction is required beyond a server running ksmbd with durable handles enabled; the attacker drives the entire sequence of SMB operations programmatically.\nS:U - Impact is confined to kernel memory corruption and privilege escalation within the same kernel security boundary; this is not a VM escape or cross-authority boundary bypass.\nC:H - The refcount race produces a deterministic use-after-free on ksmbd_file structures, and share-mode walkers read fields from freed objects without refcount protection, enabling arbitrary kernel memory disclosure via heap reuse.\nI:H - Use-after-free on slab-allocated ksmbd_file objects and corruption of m_fp_list linked lists provide memory corruption primitives that can be leveraged for arbitrary kernel writes and control-flow hijacking.\nA:H - List corruption and use-after-free on kernel linked lists and file handle structures can cause kernel oops, BUG_ON from CONFIG_DEBUG_LIST, or panic, and the scavenger race is repeatable on each durable handle expiration cycle."
    }
  }
}