Use-after-free in Linux kernel - CVE-2026-98632

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Main Vulnerability Database Vulnerabilities #VU156943

Use-after-free in Linux kernel - CVE-2026-98632

Published: October 22, 2026


Vulnerability identifier: #VU156943
CSH Severity: Low
CVSS v4: 5.6 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-98632
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local privileged user to potentially cause a denial of service through a kernel crash.

The vulnerability exists due to a use-after-free in the Bluetooth management mesh transmission cancellation logic when canceling a transmission already queued for synchronous processing. A local privileged user can cancel a queued mesh transmission to free its mesh_tx object while queued work retains a pointer to it, potentially causing a kernel crash when mesh_send_sync or its mesh_send_start_complete callback accesses the freed object.


Affected software

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)

How to mitigate CVE-2026-98632

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17

External References

Related Security Bulletins