CVE-2026-99280 is a vulnerability in Linux Kernel
Published on November 7, 2026
ksmbd: drain session procfs readers before dropping table references
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: drain session procfs readers before dropping table references
Session registration failure and connection cleanup can drop the table
reference while the per-session procfs entry is still accessible. If a
reader holds the last remaining reference, its final put calls
proc_remove() from its own callback and waits for that callback to
finish.
Remove the procfs entry before dropping the table reference in the
registration failure path. Queue sessions removed during connection
cleanup and drain their procfs readers after releasing both session
locks, then return their table references. Keep the global hash node
unhashed while a session is queued so a concurrent unregister cannot
drop the reference again.
Previous-session replacement also destroys the file table before the
session is finally freed. Detach the idr under the lock used by procfs
file counters, and report zero files after it has been detached. This
prevents a reader from accessing the idr during or after its
destruction.
Products Associated with CVE-2026-99280
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Affected Versions
Linux:- Version d7fd1f98607f2cd358e583f9548bdf0173090a86 and below 6789f0983f8e85ce3a5ed8c50fc05d613ead9c2c is affected.
- Version d7fd1f98607f2cd358e583f9548bdf0173090a86 and below 1c087cf7d5386c708d8984b263280b42b3daada0 is affected.
- Version c99ea7855124ca1428a1e59c2b4590aaef34eacf is affected.
- Version 7.2.8 and below 7.3 is affected.
- Version 7.3 is affected.
- Before 7.3 is unaffected.
- Version 7.3.2, <= 7.3.* is unaffected.
- Version 7.4-rc1, <= * is unaffected.