CVE-2026-99278
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| Linux Linux |
≥ d7fd1f98607f2cd358e583f9548bdf0173090a86; < 94f8462fc9d5332bc54e91605003c17381e9171a (affected, git) ≥ d7fd1f98607f2cd358e583f9548bdf0173090a86; < dc6aa1ba8b7fff8800ad9bf143f17d308e02ec68 (affected, git) c99ea7855124ca1428a1e59c2b4590aaef34eacf (affected, git) ≥ 7.2.8; < 7.3 (affected, semver) Other versions: unaffected |
CNA: Linux |
| Linux Linux |
7.3 (affected) ≥ 0; < 7.3 (unaffected, semver) ≥ 7.3.2; ≤ 7.3.* (unaffected, semver) ≥ 7.4-rc1; ≤ * (unaffected, original_commit_for_fix) Other versions: affected |
CNA: Linux |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
No CVSS assessment reported. An unscored record is not a low-severity determination.
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
For agents and automation
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