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CVE-2023-53421 is a Linux kernel blk-cgroup vulnerability in the cgroup v1 statistics-reset path. After blkcg_reset_stats() clears associated blkg_iostat_set instances, it fails to reinitialize their blkg pointer and sync lock fields. Subsequent use can dereference a NULL blkg pointer and panic the kernel. The fix reinitializes both fields after the memory-clear operation.
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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.
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.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.