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CVE-2026-43112 is an out-of-bounds read vulnerability in the Linux kernel SMB client subsystem, in fs/smb/client within the function cifs_sanitize_prepath(). The flaw is triggered when the function is called with an empty string or a path consisting only of delimiters such as "/". After stripping leading delimiters, the vulnerable logic may evaluate *(cursor2 - 1) before cursor2 has advanced to a valid position, causing a read before the start of the intended buffer. The upstream fix adds an early exit after delimiter stripping so that the function returns NULL when no path content remains. The issue was identified through manual audit and validated with an AddressSanitizer-backed standalone test case that reproduced a segmentation fault on affected inputs.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
16 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel vulnerability in the SMB client code involving an out-of-bounds read in cifs_sanitize_prepath.
A Linux kernel vulnerability in fs/smb/client causing an out-of-bounds read in cifs_sanitize_prepath.
A Linux kernel SMB/CIFS client out-of-bounds read vulnerability in cifs_sanitize_prepath.
A Linux kernel vulnerability in fs/smb/client causing an out-of-bounds read in cifs_sanitize_prepath.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.