CVE-2026-98456: Linux Vulnerability (CVSS 7)

Description

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.

Metrics

CVSS 3.1

7/10

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.13%

2.3th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

Vendor	Product	Versions
Linux	Linux	>= 73d1df2a7a1036a1f000e5f0ece6ade3e082b854, < fa6f79bb0009406bb11e6912b53ab7c564d6f06b; >= 73d1df2a7a1036a1f000e5f0ece6ade3e082b854, < 76dc7e0297f6f7ebefc36a69251e3f4a676d9853; >= 73d1df2a7a1036a1f000e5f0ece6ade3e082b854, < 9c32455f490b960efccedd041c7aabb1a04c5cc4; >= 73d1df2a7a1036a1f000e5f0ece6ade3e082b854, < 524e0450dd9a396f99a81b045219b0e2ea0dab57; >= 73d1df2a7a1036a1f000e5f0ece6ade3e082b854, < 8ddf962c76432a10a6cb80042875cbc48a9c056b; >= 73d1df2a7a1036a1f000e5f0ece6ade3e082b854, < 416546cd6a54e9b68f2b91bc680b1ee17dcd77a1; >= 73d1df2a7a1036a1f000e5f0ece6ade3e082b854, < 2e8bba0360d1379bfa8da47c8f5dadbb10a3fba1; >= 73d1df2a7a1036a1f000e5f0ece6ade3e082b854, < b5dbb41b212c50c095a4dbee3017a84fe94f033b
Linux	Linux	3.17

References

Timeline

Published: Oct 18, 2026
Last Modified: Oct 30, 2026
Status: Received

Frequently Asked Questions

What is 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.

How severe is CVE-2026-98456?

CVE-2026-98456 has a CVSS score of 7/10 (HIGH severity). The EPSS model estimates a 0.13% probability of exploitation in the next 30 days.

How do I fix CVE-2026-98456?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

How Strix Helps

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