Incorrect Check of Function Return Value in Linux kernel - CVE-2026-99158
Published: October 29, 2026
Vulnerability identifier: #VU158420
CSH Severity: Low
CVSS v4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-99158
CWE-ID: CWE-253
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to trigger a spurious kernel warning.
The vulnerability exists due to incorrect handling of a valid NULL return value in ring_buffer_map_get_reader() when a memory-mapped tracing ring-buffer reader catches up with a writer that is still committing events. A local user can read from the ring buffer during concurrent event commits to trigger a spurious kernel warning because the function incorrectly treats a no-data result from rb_get_reader_page() as an error.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-99158
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.115-2
linux (Debian package) - update to 6.12.115-2