ksmbd: limit sessions on each connection

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Summary

CVECVE-2026-99278
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-07 14:17:03 UTC
Updated2026-11-07 14:17:03 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d7fd1f98607f2cd358e583f9548bdf0173090a86 94f8462fc9d5332bc54e91605003c17381e9171a git Not specified
CNA Linux Linux affected d7fd1f98607f2cd358e583f9548bdf0173090a86 dc6aa1ba8b7fff8800ad9bf143f17d308e02ec68 git Not specified
CNA Linux Linux affected c99ea7855124ca1428a1e59c2b4590aaef34eacf git Not specified
CNA Linux Linux affected 7.2.8 7.3 semver Not specified
CNA Linux Linux affected 7.3 Not specified
CNA Linux Linux unaffected 7.3 semver Not specified
CNA Linux Linux unaffected 7.3.2 7.3.* semver Not specified
CNA Linux Linux unaffected 7.4-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/94f8462fc9d5332bc54e91605003c17381e9171a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/dc6aa1ba8b7fff8800ad9bf143f17d308e02ec68 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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