CVE-2026-99278
In the Linux kernel, the following vulnerability has been resolved: ksmbd: limit sessions on each connection The pending setup limit only counts InProgress ses…
Impact
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.
Affected products · Linux
| Product | Affected versions |
|---|---|
| Linux | from 7.2.8 before 7.3 from d7fd1f98607f2cd358e583f9548bdf0173090a86 before dc6aa1ba8b7fff8800ad9bf143f17d308e02ec68 from d7fd1f98607f2cd358e583f9548bdf0173090a86 before 94f8462fc9d5332bc54e91605003c17381e9171a Versions patch: 7.3.2, patch: 0, patch: 7.4-rc1 |