CVE-2026-64396 (GCVE-0-2026-64396)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:50 – Updated: 2026-08-17 04:54
VLAI
Title
ksmbd: fix UAF of struct file_lock in SMB2_LOCK deferred-lock cancellation
Summary
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix UAF of struct file_lock in SMB2_LOCK deferred-lock cancellation When a blocking byte-range lock request is deferred in the FILE_LOCK_DEFERRED path, ksmbd registers the asynchronous work into the connection's async_requests list via setup_async_work(). The cancel callback smb2_remove_blocked_lock() holds a reference to the flock. If the lock waiter is subsequently woken up but the work state is no longer KSMBD_WORK_ACTIVE (e.g., due to a concurrent cancellation), the cleanup path calls locks_free_lock(flock) without dequeuing the work from the async_requests list. Concurrently, smb2_cancel() walks the list under conn->request_lock and invokes the cancel callback, which then dereferences the already freed 'flock'. This leads to a slab-use-after-free inside __wake_up_common. Fix this by restructuring the cleanup logic after the worker returns from ksmbd_vfs_posix_lock_wait(). Move list_del(&smb_lock->llist) and release_async_work(work) to the top of the cleanup block. This guarantees that the async work is completely dequeued and serialized under conn->request_lock before locks_free_lock(flock) is called, rendering the flock unreachable for any concurrent smb2_cancel().
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 CPE status
Linux Linux Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 367c42a611fe488b7b03f1f6737f4dee0e8b20a2 (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 7703fd9aba1f2483c8e55f9ff73b7663e0761ed9 (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 463bbd79698513af4dad50fe1c573825f297ca2e (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 5aa1cb01155f96824003baf7997cdf1f150caba3 (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 5c75275c0fc9a2deb0d8f5604edcb16f288171c8 (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < d20d1c8ba5765d1d12eefc0aee6385ab3f240e1e (git)
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Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.96 , ≤ 6.12.* (semver)
Unaffected: 6.18.39 , ≤ 6.18.* (semver)
Unaffected: 7.1.4 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-08-13T16:36:55+00:00",
      "cve": "CVE-2026-64396",
      "id": "CVE-2026-64396",
      "initial_release_date": "2026-07-25T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ksmbd: Use-after-free vulnerability allows arbitrary code execution or denial of service",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64396.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:50:05Z",
      "cve": "CVE-2026-64396",
      "id": "CVE-2026-64396",
      "initial_release_date": "2026-07-25T16:00:08Z",
      "product_status:known_affected": "125",
      "product_status:known_not_affected": "251",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64396",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64396.json",
      "version": "7"
    }
  }
}



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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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.