ksmbd: unset conn->binding on failed binding request

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Summary

CVECVE-2026-31409
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-06 08:16:38 UTC
Updated2026-06-01 17:16:46 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ksmbd: unset conn->binding on failed binding request When a multichannel SMB2_SESSION_SETUP request with SMB2_SESSION_REQ_FLAG_BINDING fails ksmbd sets conn->binding = true but never clears it on the error path. This leaves the connection in a binding state where all subsequent ksmbd_session_lookup_all() calls fall back to the global sessions table. This fix it by clearing conn->binding = false in the error path.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.000130000 probability, percentile 0.023500000 (date 2026-04-27)

Problem Types: NVD-CWE-noinfo

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f5a544e3bab78142207e0242d22442db85ba1eff 7e8b270813079c785696bce8802a3f920665c88c git Not specified
CNA Linux Linux affected f5a544e3bab78142207e0242d22442db85ba1eff d073870dab8f6dadced81d13d273ff0b21cb7f4e git Not specified
CNA Linux Linux affected f5a544e3bab78142207e0242d22442db85ba1eff 6ebef4a220a1ebe345de899ebb9ae394206fe921 git Not specified
CNA Linux Linux affected f5a544e3bab78142207e0242d22442db85ba1eff 89afe5e2dbea6e9d8e5f11324149d06fa3a4efca git Not specified
CNA Linux Linux affected f5a544e3bab78142207e0242d22442db85ba1eff 9feb2d1bf86d9e5e66b8565f37f8d3a7d281a772 git Not specified
CNA Linux Linux affected f5a544e3bab78142207e0242d22442db85ba1eff 6260fc85ed1298a71d24a75d01f8b2e56d489a60 git Not specified
CNA Linux Linux affected f5a544e3bab78142207e0242d22442db85ba1eff 282343cf8a4a5a3603b1cb0e17a7083e4a593b03 git Not specified
CNA Linux Linux affected 5.15 Not specified
CNA Linux Linux unaffected 5.15 semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.167 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.130 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.78 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.20 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.10 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/89afe5e2dbea6e9d8e5f11324149d06fa3a4efca 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/6ebef4a220a1ebe345de899ebb9ae394206fe921 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/6260fc85ed1298a71d24a75d01f8b2e56d489a60 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/9feb2d1bf86d9e5e66b8565f37f8d3a7d281a772 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/282343cf8a4a5a3603b1cb0e17a7083e4a593b03 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d073870dab8f6dadced81d13d273ff0b21cb7f4e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/7e8b270813079c785696bce8802a3f920665c88c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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