CVE-2026-53198 (GCVE-0-2026-53198)
Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-06-29 04:18
VLAI
EPSS
VEX
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)
Assigner
References
6 references
Impacted products
2 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) |
|
| 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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"descriptions": [
{
"lang": "en",
"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."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
}
}
],
"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/b7063c7426ea5a4d15e01b60538718765392f49d"
},
{
"url": "https://git.kernel.org/stable/c/0da2e073f9cbf4985a0fd9acb71bc5ff599f8afd"
},
{
"url": "https://git.kernel.org/stable/c/89ae9df09d2c1fb4a4eb495c113a7ce1dca34147"
},
{
"url": "https://git.kernel.org/stable/c/14d2eee0193ac3cd1bf3d014373449f0b8d35d6d"
},
{
"url": "https://git.kernel.org/stable/c/2b2eda2821cff1d1b5a423b6ee7d8fc6fbc8e694"
},
{
"url": "https://git.kernel.org/stable/c/f580d27e8928828693df44ba2db0fffdbe11dfea"
}
],
"title": "ksmbd: fix use-after-free of a deferred file_lock on double SMB2_CANCEL",
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"datePublished": "2026-06-25T08:39:07.650Z",
"dateReserved": "2026-06-09T07:44:35.391Z",
"dateUpdated": "2026-06-29T04:18:56.058Z",
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"date": "2026-07-10",
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"source": "Microsoft CSAF VEX",
"status": "final",
"title": "ksmbd: fix use-after-free of a deferred file_lock on double SMB2_CANCEL",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-53198.json",
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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"
}
}
}
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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.
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