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A vulnerability in the Linux kernel's network scheduler (net/sched) subsystem related to the act_ife module could cause a NULL pointer dereference, leading to a system crash (general protection fault). This issue was reported by syzbot and has been resolved in updated Linux kernel versions. The vulnerability affects certain versions of the linux-azure kernel prior to specific patched releases. The CVSS score is 5.5, indicating medium severity, with impact limited to availability (system crash).

CVE-2026-23064 is a vulnerability in the Linux kernel's net/sched subsystem, specifically in the act_ife module where the function tcf_ife_encode() could return NULL without proper checks, leading to a NULL pointer dereference in ife_tlv_meta_encode(). This results in a general protection fault and potential system crash. The issue was detected by syzbot and affects linux-azure kernel versions prior to 5.15.0-1099.102~20.04.1, 5.15.0-1105.112~20.04.1, 5.15.0-1106.115~20.04.1, 5.15.0-1110.119~20.04.1, and 5.15.0-176.186~20.04.1. The vulnerability has been fixed in updated kernel releases as detailed in Ubuntu security advisories USN-8162-1 and USN-8180-1.

Detailed information about UBUNTU-CVE-2026-23064 affecting null linux-azure. Get real-time updates, technical details, and mitigation strategies.

UBUNTU-CVE-2026-23064 - Live Threat Intelligence - Threat Radar | OffSeq.com

Linux azure: In the Linux kernel, the following vulnerability has been resolved: net/sched: act_ife: avoid possible NULL deref tcf_ife_encode() must make sure… (CVE-2026-23064)

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