CVE-2026-64142 (GCVE-0-2026-64142)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:40 – Updated: 2026-07-20 13:43
VLAI
Title
ksmbd: close durable scavenger races against m_fp_list lookups
Summary
In the Linux kernel, the following vulnerability has been resolved: ksmbd: close durable scavenger races against m_fp_list lookups ksmbd_durable_scavenger() has two related races against any walker that iterates f_ci->m_fp_list, including ksmbd_lookup_fd_inode() (used by ksmbd_vfs_rename) and the share-mode checks in fs/smb/server/smb_common.c. (1) fp->node list-head reuse. Durable-preserved handles can remain linked on f_ci->m_fp_list after session teardown so share-mode checks still see them while the handle is reconnectable. The scavenger collected expired handles by adding fp->node to a local scavenger_list after removing them from the global durable idr. Because fp->node is the same list_head used by m_fp_list, list_add(&fp->node, &scavenger_list) overwrites the m_fp_list links and corrupts both lists. CONFIG_DEBUG_LIST can report this on the share-mode walk path. (2) Refcount race against m_fp_list walkers. The scavenger qualifies an expired durable handle with atomic_read(&fp->refcount) > 1 and fp->conn under global_ft.lock, removes fp from global_ft, then drops global_ft.lock before unlinking fp from m_fp_list and freeing it. During that gap fp is still linked on m_fp_list with f_state == FP_INITED. ksmbd_lookup_fd_inode() under m_lock read calls ksmbd_fp_get() (atomic_inc_not_zero on refcount that is still 1) and takes a live reference; the scavenger then unlinks and frees fp while the holder owns a reference, leading to UAF on the holder's subsequent ksmbd_fd_put() and on any field reads performed by a concurrent share-mode walker that iterates m_fp_list without taking ksmbd_fp_get() (smb_check_perm_dleases-like paths). Fix both: * Stop reusing fp->node as a scavenger-private list node. Remove one expired handle from global_ft under global_ft.lock, take an explicit transient reference, drop the lock, unlink fp->node from m_fp_list under f_ci->m_lock, then drop both the durable lifetime and transient references with atomic_sub_and_test(2, &fp->refcount). If the scavenger is the last putter the close runs there; otherwise an in-flight holder that already raced through the m_fp_list lookup owns the final close via its ksmbd_fd_put() path. The one-at-a-time disposal can rescan the durable idr when multiple handles expire in the same pass, but durable scavenging is a background expiration path and the final full scan recomputes min_timeout before the next wait. * Clear fp->persistent_id inside __ksmbd_remove_durable_fd() right after idr_remove(), so a delayed final close from a holder that snatched fp does not re-issue idr_remove() on a persistent id that idr_alloc_cyclic() in ksmbd_open_durable_fd() may have already handed out to a brand-new durable handle. * Bypass the per-conn open_files_count decrement in __put_fd_final() when fp is detached from any session table (fp->conn cleared by session_fd_check() at durable preserve -- paired with the volatile_id clear at unpublish, so checking fp->conn alone is sufficient). The walker that owns the final close runs from an unrelated work->conn whose stats.open_files_count never tracked this durable fp; without this guard the holder would underflow that unrelated counter. The two races are folded into one patch because patch (1) alone cleans up the corrupted list but leaves a deterministic UAF window for m_fp_list walkers that the transient-reference and persistent_id discipline in (2) close; bisecting onto an intermediate state would land on a UAF that pre-patch chaos merely made less reproducible. Validation: * CONFIG_DEBUG_LIST coverage for the list_head reuse path. * KASAN-enabled direct SMB2 durable-handle coverage that exercised ksmbd_durable_scavenger() and non-NULL ksmbd_lookup_fd_inode() returns while durable handles expired under concurrent rename lookups, with no KASAN, UAF, list-corruption, ODEBUG, or WARNING reports. ---truncated---
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 7f0cb478703cbeaddfe5c9101c5c73cd975d1073 , < 3a436932eb397e909d0607d76a8325abd9d85a35 (git)
Affected: d484d621d40f4a8b8959008802d79bef3609641b , < 95f072ef934ca00711d510676b8792cbf59a5aae (git)
Affected: d484d621d40f4a8b8959008802d79bef3609641b , < 5da69a65b282d2276de22e5194ba0f88c836170c (git)
Affected: d484d621d40f4a8b8959008802d79bef3609641b , < 1f8f3246d55f89350a1a67bdf3744b7241048e4e (git)
Affected: d484d621d40f4a8b8959008802d79bef3609641b , < bf736184d063da1a552ffeff0481813599a182cc (git)
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Linux Linux Affected: 6.11
Unaffected: 0 , < 6.11 (semver)
Unaffected: 6.12.92 , ≤ 6.12.* (semver)
Unaffected: 6.18.34 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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{
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      "descriptions": [
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          "lang": "en",
          "value": "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-\u003em_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-\u003enode list-head reuse.  Durable-preserved handles can remain\nlinked on f_ci-\u003em_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-\u003enode to a local\nscavenger_list after removing them from the global durable idr.\nBecause fp-\u003enode is the same list_head used by m_fp_list,\nlist_add(\u0026fp-\u003enode, \u0026scavenger_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(\u0026fp-\u003erefcount) \u003e 1 and\nfp-\u003econn 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\u0027s\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-\u003enode 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-\u003enode\n    from m_fp_list under f_ci-\u003em_lock, then drop both the durable\n    lifetime and transient references with atomic_sub_and_test(2,\n    \u0026fp-\u003erefcount).  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-\u003epersistent_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-\u003econn cleared by session_fd_check() at durable preserve --\n    paired with the volatile_id clear at unpublish, so checking\n    fp-\u003econn alone is sufficient).  The walker that owns the final\n    close runs from an unrelated work-\u003econn 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---"
        }
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            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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      "providerMetadata": {
        "dateUpdated": "2026-07-20T13:43:46.278Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3a436932eb397e909d0607d76a8325abd9d85a35"
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        },
        {
          "url": "https://git.kernel.org/stable/c/bf736184d063da1a552ffeff0481813599a182cc"
        }
      ],
      "title": "ksmbd: close durable scavenger races against m_fp_list lookups",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64142",
    "datePublished": "2026-07-19T15:40:34.605Z",
    "dateReserved": "2026-07-19T07:54:57.037Z",
    "dateUpdated": "2026-07-20T13:43:46.278Z",
    "state": "PUBLISHED"
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The scavenger\\ncollected expired handles by adding fp-\u003enode to a local\\nscavenger_list after removing them from the global durable idr.\\nBecause fp-\u003enode is the same list_head used by m_fp_list,\\nlist_add(\u0026fp-\u003enode, \u0026scavenger_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(\u0026fp-\u003erefcount) \u003e 1 and\\nfp-\u003econn 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\u0027s\\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-\u003enode 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-\u003enode\\n    from m_fp_list under f_ci-\u003em_lock, then drop both the durable\\n    lifetime and transient references with atomic_sub_and_test(2,\\n    \u0026fp-\u003erefcount).  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-\u003epersistent_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-\u003econn cleared by session_fd_check() at durable preserve --\\n    paired with the volatile_id clear at unpublish, so checking\\n    fp-\u003econn alone is sufficient).  The walker that owns the final\\n    close runs from an unrelated work-\u003econn 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---\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/smb/server/vfs_cache.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"7f0cb478703cbeaddfe5c9101c5c73cd975d1073\",\"lessThan\":\"3a436932eb397e909d0607d76a8325abd9d85a35\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d484d621d40f4a8b8959008802d79bef3609641b\",\"lessThan\":\"95f072ef934ca00711d510676b8792cbf59a5aae\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d484d621d40f4a8b8959008802d79bef3609641b\",\"lessThan\":\"5da69a65b282d2276de22e5194ba0f88c836170c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d484d621d40f4a8b8959008802d79bef3609641b\",\"lessThan\":\"1f8f3246d55f89350a1a67bdf3744b7241048e4e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d484d621d40f4a8b8959008802d79bef3609641b\",\"lessThan\":\"bf736184d063da1a552ffeff0481813599a182cc\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/smb/server/vfs_cache.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.11\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.11\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.92\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.34\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.11\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1f8f3246d55f89350a1a67bdf3744b7241048e4e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3a436932eb397e909d0607d76a8325abd9d85a35\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5da69a65b282d2276de22e5194ba0f88c836170c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/95f072ef934ca00711d510676b8792cbf59a5aae\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bf736184d063da1a552ffeff0481813599a182cc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-07-21T08:04:36+00:00",
      "cve": "CVE-2026-64142",
      "id": "CVE-2026-64142",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_not_affected": "275",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ksmbd: close durable scavenger races against m_fp_list lookups",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64142.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "critical",
      "current_release_date": "2026-07-21T12:58:56Z",
      "cve": "CVE-2026-64142",
      "id": "CVE-2026-64142",
      "initial_release_date": "2026-07-21T12:58:56Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64142",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64142.json",
      "version": "2"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.