fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath

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Summary

CVECVE-2026-43112
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-06 10:16:24 UTC
Updated2026-05-08 19:43:23 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath When cifs_sanitize_prepath is called with an empty string or a string containing only delimiters (e.g., "/"), the current logic attempts to check *(cursor2 - 1) before cursor2 has advanced. This results in an out-of-bounds read. This patch adds an early exit check after stripping prepended delimiters. If no path content remains, the function returns NULL. The bug was identified via manual audit and verified using a standalone test case compiled with AddressSanitizer, which triggered a SEGV on affected inputs.

Risk And Classification

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

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

EPSS: 0.000430000 probability, percentile 0.131380000 (date 2026-05-12)

Problem Types: CWE-125

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

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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 a31080899d5fdafcccf7f39dd214a814a2c82626 5d4fe469fe7dbff7d874c196bb680a82f2625d95 git Not specified
CNA Linux Linux affected a31080899d5fdafcccf7f39dd214a814a2c82626 2d29214448ec0f4e7e18bb1c14dd4a6c07f1c439 git Not specified
CNA Linux Linux affected a31080899d5fdafcccf7f39dd214a814a2c82626 86f9c23e0814cfdffda9eedf0c591c51ba209010 git Not specified
CNA Linux Linux affected a31080899d5fdafcccf7f39dd214a814a2c82626 49b1ce6d7cfb6c5a49f68bf5ccfcfb6ba14e63c3 git Not specified
CNA Linux Linux affected a31080899d5fdafcccf7f39dd214a814a2c82626 78ec5bf2f589ec7fd8f169394bfeca541b077317 git Not specified
CNA Linux Linux affected c63433a09d6ae4c226fcbc66da4c58fc189fd746 git Not specified
CNA Linux Linux affected 5.16 Not specified
CNA Linux Linux unaffected 5.16 semver Not specified
CNA Linux Linux unaffected 6.6.136 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.83 6.12.* 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 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/78ec5bf2f589ec7fd8f169394bfeca541b077317 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/86f9c23e0814cfdffda9eedf0c591c51ba209010 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/2d29214448ec0f4e7e18bb1c14dd4a6c07f1c439 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/5d4fe469fe7dbff7d874c196bb680a82f2625d95 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/49b1ce6d7cfb6c5a49f68bf5ccfcfb6ba14e63c3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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