NULL pointer dereference in Linux kernel - CVE-2026-52997
Published: June 25, 2026
Vulnerability identifier: #VU135376
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-52997
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a NULL pointer dereference in dualpi2_change() in the sch_dualpi2 qdisc when enforcing updated limit or memlimit values after a configuration change. A local user can trigger traffic classification that leaves packets queued in the L-queue while the C-queue is empty to cause a denial of service.
How to mitigate CVE-2026-52997
Install security update from vendor's repository.