CVE-2026-63809

CVE-2026-63809 affects the Linux kernel memory-management path used by BPF when handling proc sysctl writes. The vulnerability stems from proc_sys_call_handler() allocating a temporary sysctl buffer with kvzalloc() and passing it to __cgroup_bpf_run_filter_sysctl(); since kvzalloc() may fall back...

CVE-2026-63809

In the Linux kernel, the following vulnerability has been resolved: bpf: use kvfree for replaced sysctl write buffer procsyscallhandler allocates its temporary sysctl buffer with kvzalloc and passes it to cgroupbpfrunfiltersysctl. Since kvzalloc may fall back to vmalloc for large allocations,...

CVE-2026-63809 bpf: use kvfree() for replaced sysctl write buffer

In the Linux kernel, the following vulnerability has been resolved: bpf: use kvfree for replaced sysctl write buffer procsyscallhandler allocates its temporary sysctl buffer with kvzalloc and passes it to cgroupbpfrunfiltersysctl. Since kvzalloc may fall back to vmalloc for large allocations,...

PT-2026-61125

Name of the Vulnerable Software and Affected Versions Linux kernel versions prior to 7.1-rc5 Description Memory corruption can occur in the BPF sysctl handler. The proc sys call handler function allocates a temporary sysctl buffer using kvzalloc, which may use vmalloc for large allocations...

USN-5814-1: Linux kernel vulnerabilities

Kyle Zeng discovered that the sysctl implementation in the Linux kernel contained a stack-based buffer overflow. A local attacker could use this to cause a denial of service system crash or execute arbitrary code. CVE-2022-4378 Tamás Koczka discovered that the Bluetooth L2CAP handshake...

Debian DSA-1018-2 : kernel-source-2.4.27 - several vulnerabilities

The original update lacked recompiled ALSA modules against the new kernel ABI. Furthermore, kernel-latest-2.4-sparc now correctly depends on the updated packages. For completeness we're providing the original problem description : Several local and remote vulnerabilities have been discovered in t...