CVE-2026-53198 (GCVE-0-2026-53198)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-08-05 12:34
VLAI
Title
ksmbd: fix use-after-free of a deferred file_lock on double SMB2_CANCEL
Summary
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free of a deferred file_lock on double SMB2_CANCEL A deferred byte-range lock (an SMB2_LOCK that blocks) registers an async work on conn->async_requests via setup_async_work(), with cancel_fn = smb2_remove_blocked_lock and cancel_argv[0] pointing at the struct file_lock. When the request is cancelled, the worker frees the file_lock with locks_free_lock() and takes the cancelled early-exit, which "goto out"s and never reaches release_async_work() -- the only site that unlinks the work from conn->async_requests and clears cancel_fn/cancel_argv. The work therefore stays matchable on async_requests with a live cancel_fn pointing at the freed file_lock, until connection teardown finally runs release_async_work(). smb2_cancel() fires cancel_fn unconditionally with no state guard, so a second SMB2_CANCEL for the same AsyncId, arriving in that window, re-runs smb2_remove_blocked_lock() on the freed file_lock -- a slab use-after-free: BUG: KASAN: slab-use-after-free in __locks_delete_block __locks_delete_block locks_delete_block ksmbd_vfs_posix_lock_unblock smb2_remove_blocked_lock smb2_cancel <- 2nd SMB2_CANCEL fires cancel_fn handle_ksmbd_work Allocated by ...: locks_alloc_lock <- smb2_lock Freed by ...: locks_free_lock <- smb2_lock (cancelled branch) ... cache file_lock_cache of size 192 Reproduced on mainline with KASAN by an authenticated SMB client. Skip a work whose state is already KSMBD_WORK_CANCELLED so its cancel callback cannot be fired a second time.
Severity
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < b7063c7426ea5a4d15e01b60538718765392f49d (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 0da2e073f9cbf4985a0fd9acb71bc5ff599f8afd (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 89ae9df09d2c1fb4a4eb495c113a7ce1dca34147 (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 14d2eee0193ac3cd1bf3d014373449f0b8d35d6d (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 2b2eda2821cff1d1b5a423b6ee7d8fc6fbc8e694 (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < f580d27e8928828693df44ba2db0fffdbe11dfea (git)
Create a notification for this product.
Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.94 , ≤ 6.12.* (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free of a deferred file_lock on double SMB2_CANCEL\n\nA deferred byte-range lock (an SMB2_LOCK that blocks) registers an async work on\nconn-\u003easync_requests via setup_async_work(), with cancel_fn =\nsmb2_remove_blocked_lock and cancel_argv[0] pointing at the struct file_lock.\n\nWhen the request is cancelled, the worker frees the file_lock with\nlocks_free_lock() and takes the cancelled early-exit, which \"goto out\"s and never\nreaches release_async_work() -- the only site that unlinks the work from\nconn-\u003easync_requests and clears cancel_fn/cancel_argv. The work therefore stays\nmatchable on async_requests with a live cancel_fn pointing at the freed file_lock,\nuntil connection teardown finally runs release_async_work().\n\nsmb2_cancel() fires cancel_fn unconditionally with no state guard, so a second\nSMB2_CANCEL for the same AsyncId, arriving in that window, re-runs\nsmb2_remove_blocked_lock() on the freed file_lock -- a slab use-after-free:\n\n  BUG: KASAN: slab-use-after-free in __locks_delete_block\n    __locks_delete_block\n    locks_delete_block\n    ksmbd_vfs_posix_lock_unblock\n    smb2_remove_blocked_lock\n    smb2_cancel                 \u003c- 2nd SMB2_CANCEL fires cancel_fn\n    handle_ksmbd_work\n  Allocated by ...: locks_alloc_lock \u003c- smb2_lock\n  Freed by ...:     locks_free_lock  \u003c- smb2_lock (cancelled branch)\n  ... cache file_lock_cache of size 192\n\nReproduced on mainline with KASAN by an authenticated SMB client.\n\nSkip a work whose state is already KSMBD_WORK_CANCELLED so its cancel callback\ncannot be fired a second time."
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              "value": "AV:N - ksmbd is an in-kernel SMB server reachable over the network via SMB2/SMB3 requests, typically on TCP port 445. The vulnerable path is driven by SMB2_LOCK and repeated SMB2_CANCEL messages from a remote SMB client.\nAC:L - The attacker can create the deferred byte-range lock by holding a conflicting lock and then sending repeated SMB2_CANCEL requests for the same AsyncId. The race/window is attacker-driven and repeatable, so there are no meaningful conditions outside attacker control.\nPR:L - The SMB2_LOCK path requires a valid SMB2 session, tree connection, and open file handle, and the fix commit states it was reproduced by an authenticated SMB client. No kernel or administrative privilege is required, only ordinary SMB access.\nUI:N - No victim user action is required after the attacker has SMB access. The attacker sends the lock and cancel requests directly to the server.\nS:U - The vulnerability corrupts memory within the same kernel security authority that processes the SMB request. It does not cross a separate sandbox, hypervisor, or device security boundary.\nC:H - This is a slab use-after-free of struct file_lock from file_lock_cache, and the stale callback reuses the freed object in generic file-locking code. Under the required high-severity assumption for UAFs, this can support kernel memory disclosure.\nI:H - The stale file_lock is passed into list and waitqueue manipulation paths such as locks_delete_block and locks_wake_up, giving a plausible kernel memory corruption primitive after heap reuse. Under the required high-severity assumption for UAFs, integrity impact is high.\nA:H - The commit includes a KASAN slab-use-after-free report in the ksmbd worker path, and re-triggering the bug can crash or destabilize the kernel. Kernel oops/panic availability impact is high."
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      "title": "ksmbd: fix use-after-free of a deferred file_lock on double SMB2_CANCEL",
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cancel callback\\ncannot be fired a second 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    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-27T16:34:46+00:00",
      "cve": "CVE-2026-53198",
      "id": "CVE-2026-53198",
      "initial_release_date": "2026-06-25T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ksmbd: fix use-after-free of a deferred file_lock on double SMB2_CANCEL",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53198.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-15T05:04:21Z",
      "cve": "CVE-2026-53198",
      "id": "CVE-2026-53198",
      "initial_release_date": "2026-06-26T02:10:22Z",
      "product_status:known_affected": "114",
      "product_status:known_not_affected": "179",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53198",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53198.json",
      "version": "5"
    }
  }
}



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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.