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CVE-2021-43389 is an array-index-out-of-bounds vulnerability in the Linux kernel, specifically in the detach_capi_ctr function within drivers/isdn/capi/kcapi.c, present in versions before 5.14.15. The flaw allows for out-of-bounds access due to improper validation of array indices when detaching CAPI controllers.
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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.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel array-index-out-of-bounds vulnerability in detach_capi_ctr() in the CAPI ISDN driver.
Linux kernel array-index-out-of-bounds vulnerability in the ISDN CAPI detach_capi_ctr() function.
Linux kernel array-index-out-of-bounds vulnerability in the ISDN CAPI subsystem.
Linux kernel array-index-out-of-bounds vulnerability in the ISDN CAPI subsystem.
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.