Loading vulnerability…
CVE-2026-31433 is an out-of-bounds write vulnerability in the Linux kernel's ksmbd SMB server implementation, specifically in handling compound SMB requests involving QUERY_DIRECTORY followed by QUERY_INFO with FILE_ALL_INFORMATION. When the first command in the compound request consumes nearly all of max_trans_size, get_file_all_info() can proceed without validating the remaining response-buffer space against the client-supplied OutputBufferLength before copying the filename into the FileName field of an smb2_file_all_info structure. In the vulnerable path, get_file_all_info() calls smbConvertToUTF16() using PATH_MAX rather than the actual remaining buffer capacity, which can write past the end of the response buffer during filename conversion. The fix computes the actual free output-buffer space with smb2_calc_max_out_buf_len(), rejects insufficient space with -EINVAL, and updates smbConvertToUTF16() usage to copy only the actual filename length, clamped by PATH_MAX.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
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.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A remote, unauthenticated out-of-bounds write vulnerability in the Linux kernel ksmbd component caused by compound SMB requests and insufficient bounds checking.
A specific vulnerability identified as CVE-2026-31433, referenced in the context of remote Linux kernel out-of-bounds writes.
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.