In 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.

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 affected < 5d4fe469fe7dbff7d874c196bb680a82f2625d95
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 affected < 2d29214448ec0f4e7e18bb1c14dd4a6c07f1c439
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 affected < 86f9c23e0814cfdffda9eedf0c591c51ba209010
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 affected < 49b1ce6d7cfb6c5a49f68bf5ccfcfb6ba14e63c3
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 affected < 78ec5bf2f589ec7fd8f169394bfeca541b077317
Linux Linux affected
Version Status Constraints
6.6.136 unaffected ≤ 6.6.*
6.12.83 unaffected ≤ 6.12.*
6.18.24 unaffected ≤ 6.18.*
6.19.14 unaffected ≤ 6.19.*
7.0 unaffected ≤ *

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Fixes

Solution

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Workaround

No workaround given by the vendor.

References
Link Providers
https://git.kernel.org/stable/c/2d29214448ec0f4e7e18bb1c14dd4a6c07f1c439 cve-icon cve-icon
https://git.kernel.org/stable/c/49b1ce6d7cfb6c5a49f68bf5ccfcfb6ba14e63c3 cve-icon cve-icon
https://git.kernel.org/stable/c/5d4fe469fe7dbff7d874c196bb680a82f2625d95 cve-icon cve-icon
https://git.kernel.org/stable/c/78ec5bf2f589ec7fd8f169394bfeca541b077317 cve-icon cve-icon
https://git.kernel.org/stable/c/86f9c23e0814cfdffda9eedf0c591c51ba209010 cve-icon cve-icon
History

Wed, 06 May 2026 12:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-125

Wed, 06 May 2026 09:30:00 +0000

Type Values Removed Values Added
Description In 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.
Title fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-05-06T07:40:38.563Z

Reserved: 2026-05-01T14:12:55.986Z

Link: CVE-2026-43112

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-05-06T10:16:24.927

Modified: 2026-05-06T10:16:24.927

Link: CVE-2026-43112

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-06T12:15:03Z

Weaknesses