NULL pointer dereference in Linux kernel - CVE-2026-99247
Published: November 3, 2026
Vulnerability identifier: #VU158994
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-2026-99247
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to potentially cause a denial of service during system boot.
The vulnerability exists due to a null pointer dereference in the Linux kernel tracing subsystem when tracefs initialization proceeds after early-boot trace buffer allocation fails. A local user can potentially exploit the resulting access to an uninitialized event list to cause a kernel Oops and disrupt system startup.
Affected software
Linux kernel
How to mitigate CVE-2026-99247
Install security update from vendor's repository.
External References
- https://git.kernel.org/stable/c/7539c61f522ff693d9565a0411386c2236e776cd
- https://git.kernel.org/stable/c/813e18881c6472eb229a63180ff42c808e3e949b
- https://git.kernel.org/stable/c/afd38b10b1c6a5c5d6952b15b990596dab9684e6
- https://git.kernel.org/stable/c/b3b974008388ab59e44d764ba7a63c988fec2524
- https://git.kernel.org/stable/c/e8665e884e076d894f3eed8b9ea28e37a6448604
- https://git.kernel.org/stable/c/e8cfcd7e60eaa3b0dea4d71c64499604e7081736