Linux kernel versions 4.4 and above where CONFIG_BPF_SYSCALL and kernel.unprivileged_bpf_disabled sysctl is not set to 1 allow for BPF to be abused for privilege escalation. Ubuntu 16.04 has all of these conditions met.
f1306f2352a229f463a8023d32004c95fc69e0766b3089ee18e864c38cfcb735Ubuntu Security Notice 2965-4 - Jann Horn discovered that the extended Berkeley Packet Filter (eBPF) implementation in the Linux kernel did not properly reference count file descriptors, leading to a use-after-free. A local unprivileged attacker could use this to gain administrative privileges. Ralf Spenneberg discovered that the USB sound subsystem in the Linux kernel did not properly validate USB device descriptors. An attacker with physical access could use this to cause a denial of service (system crash). Various other issues were also addressed.
b980b1fb461a05f96b89931ea8854c8fb764d3a6a3ea6ec9be99cb03392277a0Ubuntu Security Notice 2965-3 - Jann Horn discovered that the extended Berkeley Packet Filter (eBPF) implementation in the Linux kernel did not properly reference count file descriptors, leading to a use-after-free. A local unprivileged attacker could use this to gain administrative privileges. Ralf Spenneberg discovered that the USB sound subsystem in the Linux kernel did not properly validate USB device descriptors. An attacker with physical access could use this to cause a denial of service (system crash). Various other issues were also addressed.
4e5b67ecd64a48a40bb846ae2b44ca9d5d6f5587e29332b9503dcdb6f3cc3bceUbuntu Security Notice 2965-1 - Jann Horn discovered that the extended Berkeley Packet Filter (eBPF) implementation in the Linux kernel did not properly reference count file descriptors, leading to a use-after-free. A local unprivileged attacker could use this to gain administrative privileges. Ralf Spenneberg discovered that the USB sound subsystem in the Linux kernel did not properly validate USB device descriptors. An attacker with physical access could use this to cause a denial of service (system crash). Various other issues were also addressed.
962749c42e747d98bec1018a0419b51785f0f882d0fec9774fb21cb7fa004936Ubuntu Security Notice 2965-2 - USN-2965-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement (HWE) kernel from Ubuntu 16.04 LTS for Ubuntu 14.04 LTS. Jann Horn discovered that the extended Berkeley Packet Filter (eBPF) implementation in the Linux kernel did not properly reference count file descriptors, leading to a use-after-free. A local unprivileged attacker could use this to gain administrative privileges. Various other issues were also addressed.
6b52d036c57f1e7c2af2ead1821e8dddc36f23e6a3f79a1abfec9c19421a8b56Linux 4.4 suffers from a use-after-free vulnerability in double-fdput().
fdf02d266337b84af0f49b7c8b000f74559cac23baf06e83b0bb199f19224b59
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