CVE-2026-99278 is a vulnerability in Linux Kernel
Published on November 7, 2026
ksmbd: limit sessions on each connection
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: limit sessions on each connection
The pending setup limit only counts InProgress sessions. A client can
complete authentication repeatedly and retain an unbounded number of Valid
sessions on one connection.
Reserve a connection slot before allocating a session and retain a
connection reference while authentication is in progress. The first SMB3
channel takes over that reservation; binding to another connection reserves
one slot there. Reauthentication and authentication continuation reuse the
existing reservation. Return slots on allocation or insertion failure,
channel removal, and final session destruction.
Accept max_sessions_per_connection in reserved startup-request space and
default to 64 when older tools leave it zero. Keep the request size and
existing field offsets unchanged. Expose the configured limit in procfs.
The existing connection limits bound the aggregate number of sessions
without a separate global session allocation limit.
Products Associated with CVE-2026-99278
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Affected Versions
Linux:- Version d7fd1f98607f2cd358e583f9548bdf0173090a86 and below 94f8462fc9d5332bc54e91605003c17381e9171a is affected.
- Version d7fd1f98607f2cd358e583f9548bdf0173090a86 and below dc6aa1ba8b7fff8800ad9bf143f17d308e02ec68 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.