CVE-2026-68381 is a vulnerability in Linux Kernel
Published on August 10, 2026
ksmbd: pin conn during async oplock break notification
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: pin conn during async oplock break notification
smb2_oplock_break_noti() and smb2_lease_break_noti() store a ksmbd_conn
pointer in an async ksmbd_work and then queue that work on ksmbd-io. The
work only increments conn->r_count, which prevents teardown from passing
the pending-request wait after the increment, but it does not pin the
struct ksmbd_conn object.
If connection teardown races with an oplock break notification, the last
conn reference can be dropped before the queued worker finishes. The
worker then uses the freed conn in ksmbd_conn_write() and
ksmbd_conn_r_count_dec().
Take a real conn reference when publishing the conn pointer to the async
work item, and drop it after the notification work has decremented
r_count. Apply the same lifetime rule to lease break notification, which
uses the same work->conn pattern.
Products Associated with CVE-2026-68381
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Affected Versions
Linux:- Version 09aeab68033161cb54f194da93e51a11aee6144b and below 0f72fc9659d7f585460d43c158055df5afdcffb6 is affected.
- Version a4261bbc33fbf99b99c80aa3a2c5097611802980 and below 793e1c7041b93af96ff87e678329bc16aee7ba88 is affected.
- Version 3aa660c059240e0c795217182cf7df32909dd917 and below 6ecb252efa0b413ac3d9979fb4eec247f8fc1258 is affected.
- Version 3aa660c059240e0c795217182cf7df32909dd917 and below 14062c74e5b25c27edcff7a2fe0dc701c930b372 is affected.
- Version 3aa660c059240e0c795217182cf7df32909dd917 and below aa5d8f3f96aa11a4a54ce993c11ce8af11c546f9 is affected.
- Version f17d1c63a76b0fe8e9c78023a86507a3a6d62cfa is affected.
- Version 6.6.84 and below 6.6.148 is affected.
- Version 6.12.20 and below 6.12.101 is affected.
- Version 6.13.8 and below 6.14 is affected.
- Version 6.14 is affected.
- Before 6.14 is unaffected.
- Version 6.6.148, <= 6.6.* is unaffected.
- Version 6.12.101, <= 6.12.* is unaffected.
- Version 6.18.42, <= 6.18.* is unaffected.
- Version 7.1.6, <= 7.1.* is unaffected.
- Version 7.2-rc4, <= * is unaffected.