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CVE-2021-47544 is a memory-corruption vulnerability in the Linux kernel TCP send path, specifically tcp_sendmsg_locked(). When TCP copies from a memory-mapped user-space buffer backed by a CIFS mount, a page fault can invoke CIFS readahead and initiate an SMB transaction through another socket in the same process context. The nested socket allocation can reuse and modify the task's socket page fragment while the outer tcp_sendmsg_locked() invocation is still using it, resulting in page-fragment corruption and corruption of transmitted TCP-stream data. The fix prevents use of the socket page fragment for allocations that lack __GFP_FS, avoiding this recursion scenario.
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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.
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A network-reachable vulnerability with high attack complexity that can result in high confidentiality impact; the content does not identify the affected component or provide technical vulnerability details.
A Linux kernel vulnerability addressed by this advisory; technical details are not provided in the content.
A CVE referenced by the Red Hat kernel security advisory; the content does not describe its technical impact.
A Linux kernel vulnerability addressed by this advisory; the content provides no further details.
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.