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CVE-2021-43389 is an array-index-out-of-bounds flaw in the Linux kernel CAPI ISDN subsystem, in detach_capi_ctr() within drivers/isdn/capi/kcapi.c. In kernels before 5.14.15, detaching a registered CAPI controller that has not yet been attached can cause invalid array indexing. CVE-2021-3896 was rejected as a duplicate; CVE-2021-43389 is the valid identifier.
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No public exploit code observed for this vulnerability.
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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.