Use-after-free in Linux kernel - CVE-2026-98737

Vulnerability identifier: #VU157085

CSH Severity: Low

CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-98737

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to potentially cause a denial of service by triggering access to freed Bluetooth inquiry-cache entries.

The vulnerability exists due to use-after-free in the Linux kernel Bluetooth inquiry-cache handling in hci_acl_create_conn_sync() and hci_stop_discovery_sync() when preparing connection or discovery-cancellation commands concurrently with cache updates or flushes. A local user can trigger an HCIINQUIRY ioctl concurrently with these operations to free a cache entry after lookup but before the worker reads its fields, potentially causing a kernel crash.

Linux kernel
SUSE Linux Micro
SUSE Linux Micro Extras
kernel-default
kernel-64kb
kernel-64kb-debugsource
kernel-64kb-devel
kernel-default-devel
kernel-syms
kernel-obs-build
kernel-obs-build-debugsource
kernel-default-debugsource
kernel-default-devel-debuginfo

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel-default - update to 6.4.0-159998.55.1
kernel-64kb - update to 6.4.0-159998.55.1
kernel-64kb-debugsource - update to 6.4.0-159998.55.1
kernel-64kb-devel - update to 6.4.0-159998.55.1
kernel-default-devel - update to 6.4.0-159998.55.1
kernel-syms - update to 6.4.0-159998.55.1
kernel-obs-build - update to 6.4.0-159998.55.1
kernel-obs-build-debugsource - update to 6.4.0-159998.55.1
kernel-default-debugsource - update to 6.4.0-159998.55.1
kernel-default-devel-debuginfo - update to 6.4.0-159998.55.1

• https://git.kernel.org/stable/c/333257e6e4a7bcaaea82fd357121d0f1e6b76c7b
• https://git.kernel.org/stable/c/52edf1c0e59dea37b8368c4a2559dca96b2fdfea
• https://git.kernel.org/stable/c/8ed67535fdff40ca652bcd4ac7da68d11d01bd34
• https://git.kernel.org/stable/c/a642f498f0b08f2aa9f4a69468db92f57a72349d
• https://git.kernel.org/stable/c/ddc9edb244cc8b5266595e8fc220e7813f2b603a

• Use-after-free in Linux kernel bluetooth
• SUSE update for the Linux Kernel