HighFix available
fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath
Type: advisorySources: OSV
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.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.15.209, 6.1.175, 6.12.83, 6.18.24, 6.19.14, 6.6.136
- CVEs
- CVE-2026-43112
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 22:57 UTC · Revision 1
Source evidence
fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath
core-osv · Original sourcePublished 6 May 2026, 07:40 UTC
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.
osv:CVE-2026-43112
Kernel
Fixed versions: 5.15.209, 6.1.175, 6.6.136, 6.12.83, 6.18.24, 6.19.14
Complete source record
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"title": "fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath",
"summary": "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.",
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