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CVE-2024-56626 is an out-of-bounds write vulnerability in the Linux kernel ksmbd (in-kernel SMB server) component, specifically in ksmbd_vfs_stream_write. A client-supplied offset can be negative, leading to writes occurring outside the bounds of an allocated buffer. The issue is triggered in configurations where ksmbd is set with vfs objects = streams_xattr in ksmbd.conf, which enables the relevant stream/xattr handling path.
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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.
vfs objects = streams_xattr in ksmbd.conf and/or disabling ksmbd where not required, and restrict network access to the SMB service to trusted clients only.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.
1 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
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.