smb: client: fix ALIGN() overflow in symlink_data() error context loop

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89634
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:49 UTC
Updated2026-10-19 09:18:00 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: smb: client: fix ALIGN() overflow in symlink_data() error context loop The check added by commit 7d9a7f1f96cd ("smb/client: fix possible infinite loop and oob read in symlink_data()") compared the post-ALIGN length against the remaining buffer, but ALIGN() itself can overflow: for ErrorDataLength near UINT32_MAX (e.g. 0xFFFFFFF9), ALIGN(x, 8) wraps to 0, so the subsequent bounds check passes, and the loop advances by zero bytes leaving 'p' pointing into stale data. Fix by checking the raw ErrorDataLength against the remaining space before applying ALIGN(), then checking again after. Since raw_len is bounded by the buffer, raw_len + 7 cannot overflow, so the second check is an exact post-alignment bounds guard.

Risk And Classification

Primary CVSS: v3.1 9.1 CRITICAL from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.006530000 probability, percentile 0.493550000 (date 2026-09-14)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
3.1CNADECLARED9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 76894f3e2f71177747b8b4763fb180e800279585 2b4a25baa0b936fef6915c0459925077b324ecaf git Not specified
CNA Linux Linux affected 76894f3e2f71177747b8b4763fb180e800279585 b89d678f9eafcf8d74885983166ba26b40a04ea0 git Not specified
CNA Linux Linux affected 76894f3e2f71177747b8b4763fb180e800279585 657372ba6ea50b4474d2a6a610097eae8cd1f3e9 git Not specified
CNA Linux Linux affected 76894f3e2f71177747b8b4763fb180e800279585 1f824f61d1df52392eaf0b74dfa5659d724fde30 git Not specified
CNA Linux Linux affected 76894f3e2f71177747b8b4763fb180e800279585 62a3025983c8c735a3c6fc85a59316f31b59af07 git Not specified
CNA Linux Linux affected 76894f3e2f71177747b8b4763fb180e800279585 62656b024efc21c3230eade1a847f25871c3d2bb git Not specified
CNA Linux Linux affected 2d046892a493d9760c35fdaefc3017f27f91b621 git Not specified
CNA Linux Linux affected 6.0.16 6.1 semver Not specified
CNA Linux Linux affected 6.1 Not specified
CNA Linux Linux unaffected 6.1 semver Not specified
CNA Linux Linux unaffected 6.1.188 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/1f824f61d1df52392eaf0b74dfa5659d724fde30 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b89d678f9eafcf8d74885983166ba26b40a04ea0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2b4a25baa0b936fef6915c0459925077b324ecaf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/657372ba6ea50b4474d2a6a610097eae8cd1f3e9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/62656b024efc21c3230eade1a847f25871c3d2bb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/62a3025983c8c735a3c6fc85a59316f31b59af07 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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