smb: server: avoid double-free in smb_direct_free_sendmsg after smb_direct_flush_send_list()

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Summary

CVECVE-2026-31608
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-24 15:16:40 UTC
Updated2026-04-29 20:03:44 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: smb: server: avoid double-free in smb_direct_free_sendmsg after smb_direct_flush_send_list() smb_direct_flush_send_list() already calls smb_direct_free_sendmsg(), so we should not call it again after post_sendmsg() moved it to the batch list.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.000180000 probability, percentile 0.046080000 (date 2026-04-27)

Problem Types: CWE-415

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:N/AC:L/PR:N/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 5ef18a2e66f2f33fdac64437bddfb9fe6389fdc7 6968c91fab05b8fc4d6700e0cf34472bb422df25 git Not specified
CNA Linux Linux affected 79242e7b6bc63efec28b7c235bc320806afce6c0 2ba03f46132b0d1a7bafb86e1ef61951a2254023 git Not specified
CNA Linux Linux affected 34abd408c8ba24d7c97bd02ba874d8c714f49db1 830de6eeb9db4cb7e758201fb99328ef4ca4b032 git Not specified
CNA Linux Linux affected 34abd408c8ba24d7c97bd02ba874d8c714f49db1 84ff995ae826aa6bbcc6c7b9ea569ff67c021d72 git Not specified
CNA Linux Linux affected 7.0 Not specified
CNA Linux Linux unaffected 7.0 semver Not specified
CNA Linux Linux unaffected 6.18.24 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.14 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0.1 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/6968c91fab05b8fc4d6700e0cf34472bb422df25 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/84ff995ae826aa6bbcc6c7b9ea569ff67c021d72 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/830de6eeb9db4cb7e758201fb99328ef4ca4b032 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/2ba03f46132b0d1a7bafb86e1ef61951a2254023 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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