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CVE-2021-47353 is a NULL pointer dereference in the Linux kernel UDF filesystem implementation. In udf_symlink(), the buffer-head member of the extent position structure is assigned the return value of udf_tgetblk(), which can return NULL when the underlying block-buffer acquisition fails. The vulnerable code dereferences that member without validating it. The upstream fix adds a NULL check before the buffer head is used.
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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.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A NULL-pointer dereference in the Linux kernel UDF filesystem symlink handler.
Linux kernel UDF filesystem symlink null-pointer-dereference vulnerability.
Linux kernel UDF filesystem null-pointer dereference vulnerability in udf_symlink.
Linux kernel UDF filesystem NULL-pointer dereference in udf_symlink.
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.