CVE-2026-98459
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: balance the parent hold in hci_bind_bis() hci_conn_link() takes a lifetime reference to its parent with hci_conn_get(), but only takes an operational hold on the child. hci_conn_unlink() later balances both a hold and a reference on the parent. The SCO and CIS paths pass a parent acquired from a connect helper, so it already has a hold. For an additional BIS, hci_bind_bis() obtains the parent from hci_conn_hash_lookup_big(), which returns a bare pointer. Unlinking the child then drops the parent's existing hold and can schedule it for disconnection while its socket is still using it. Take a hold on the parent before linking it and drop that hold if linking fails. A successful link transfers the hold to hci_conn_unlink().
Affected versions
Linux kernel versions
6.6.67,
6.8
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-2026-98459?
CVE-2026-98459 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.6.67 onward and has been patched in 6.6.158, 6.12.112, 6.18.55 and others. CVE-2026-98459 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-2026-98459?
Yes. CVE-2026-98459 has been patched. Fixed versions include 6.6.158, 6.12.112, 6.18.55 and others. If you are running Linux kernel 6.6.67 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-98459 actively exploited?
No. CVE-2026-98459 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.