CVE-2026-98456
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: mgmt: fix race in read_unconf_index_list() read_unconf_index_list() counts unconfigured controllers before allocating its response, then checks the device flags again while filling it. hci_dev_list_lock stabilizes list membership, but it does not serialize the per-device flags. During asynchronous controller setup, the worker can set HCI_UNCONFIGURED and clear HCI_SETUP between the two passes. A controller omitted from the allocation count can then become eligible for the fill pass, causing an out-of-bounds write to rp->index[]. Allocate space for every device on hci_dev_list. Since list membership cannot change while hci_dev_list_lock is held, the response remains large enough regardless of flag transitions. The reported count and response length still include only eligible unconfigured controllers.
Affected versions
Linux kernel versions
3.17
and later are affected. Fixed in
6.6.158,
6.12.112,
6.18.55,
7.2.9,
7.3
and their respective stable series.
References
5 totalFrequently asked questions
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What is CVE-2026-98456?
CVE-2026-98456 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 3.17 onward and has been patched in 6.6.158, 6.12.112, 6.18.55 and others. CVE-2026-98456 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-98456?
Yes. CVE-2026-98456 has been patched. Fixed versions include 6.6.158, 6.12.112, 6.18.55 and others. If you are running Linux kernel 3.17 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-98456 actively exploited?
No. CVE-2026-98456 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.