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CVE-2023-53421 is a NULL-pointer dereference vulnerability in the Linux kernel's blk-cgroup subsystem. The cgroup v1 blkcg_reset_stats() function clears blkg_iostat_set structures without reinitializing their blkg and sync fields, which require initialization when associated structures are allocated by blkg_alloc(). Subsequent access through the cleared blkg pointer can cause a kernel panic. Failure to reinitialize sync can also cause lockdep initialization problems in debug kernels.
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No public exploit code observed for this vulnerability.
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8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel blk-cgroup initialization flaw affecting the blkg and sync fields after statistics are reset. A NULL pointer access can cause a kernel panic and denial of service; missing sync initialization can also cause lockdep issues in debug kernels. The advisory assigns a CVSS v3 base score of 5.5, with local access and low privileges required.
A Linux kernel blk-cgroup flaw in which improperly reinitialized I/O statistics structures after a statistics reset can cause a local kernel panic through a NULL-pointer dereference, resulting in denial of service.
Linux kernel vulnerability addressed by this Red Hat kernel update; the advisory provides no further technical description.
Linux kernel vulnerability addressed by the Red Hat kernel update; no specific technical description is supplied in this advisory.
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.