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CVE-2024-56591: Bluetooth: hci_conn: Use disable_delayed_work_sync

mediumCVSS 5.5CVE-2024-56591

CSIRTS triage

vendor: Linuxproduct: Linux KernelMemory corruption
What
A use-after-free or synchronization issue in the Bluetooth HCI connection layer (hci_conn) caused by improper delayed work cancellation.
Who is affected
Systems with Bluetooth enabled running affected kernel versions.
Urgency
Moderate urgency; CVSS 5.5 indicates local DoS or memory corruption potential requiring kernel update.
Action
Apply kernel patches addressing disabled_delayed_work_sync for Bluetooth hci_conn.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
medium — CVSS 5.5
Published
2026-08-06
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-56591

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2024-56591coverage & exploitation statusNVD · CVE.org

Recent advisories for Bluetooth

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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