A race condition in perf_event_open() allows local attackers to leak sensitive data from setuid programs. As no relevant locks (in particular the cred_guard_mutex) are held during the ptrace_may_access() call, it is possible for the specified target task to perform an execve() syscall with setuid execution before perf_event_alloc() actually attaches to it, allowing an attacker to bypass the ptrace_may_access() check and the perf_event_exit_task(current) call that is performed in install_exec_creds() during privileged execve() calls. This issue affects kernel versions before 4.8.

A race condition in perf_event_open() allows local attackers to leak sensitive data from setuid programs. As no relevant locks (in particular the cred_guard_mutex) are held during the ptrace_may_access() call, it is possible for the specified target task to perform an execve() syscall with setuid execution before perf_event_alloc() actually attaches to it, allowing an attacker to bypass the ptrace_may_access() check and the perf_event_exit_task(current) call that is performed in install_exec_creds() during privileged execve() calls. This issue affects kernel versions before 4.8.

kernel: out of bound read in DVB connexant driver. kernel: Missing permissions check for request_key() destination allows local attackers to add keys to keyring without Write permission kernel: denial of service via ioctl call in network tun handling kernel: oob memory read in hso_probe in drivers/net/usb/hso.c kernel: usb: missing size check in the __usb_get_extra_descriptor() leading to DoS kernel: perf_event_open() and execve() race in setuid programs allows a data leak kernel: triggering AP to send IAPP location updates for stations before the required authentication process has completed can lead to DoS kernel: brcmfmac frame validation bypass kernel: null-pointer dereference in hci_uart_set_flow_control Kernel: net: weak IP ID generation leads to remote device tracking Kernel: net: using kernel space address bits to derive IP ID may potentially break KASLR kernel: ASLR bypass for setuid binaries due to late install_exec_creds() kernel: sensitive information disclosure from kernel stack memory via HIDPCONNADD command kernel: unchecked kstrdup of fwstr in drm_load_edid_firmware leads to denial of service kernel: use-after-free in arch/x86/lib/insn-eval.c kernel: denial of service in arch/powerpc/kernel/signal_32.c and arch/powerpc/kernel/signal_64.c via sigreturn() system call kernel: integer overflow and OOB read in drivers/block/floppy.c kernel: heap overflow in mwifiex_set_uap_rates() function of Marvell Wifi Driver leading to DoS kernel: heap-overflow in mwifiex_set_…

kernel: out of bound read in DVB connexant driver. kernel: Missing permissions check for request_key() destination allows local attackers to add keys to keyring without Write permission kernel: denial of service via ioctl call in network tun handling kernel: oob memory read in hso_probe in drivers/net/usb/hso.c kernel: usb: missing size check in the __usb_get_extra_descriptor() leading to DoS kernel: perf_event_open() and execve() race in setuid programs allows a data leak kernel: brcmfmac frame validation bypass kernel: null-pointer dereference in hci_uart_set_flow_control Kernel: net: weak IP ID generation leads to remote device tracking Kernel: net: using kernel space address bits to derive IP ID may potentially break KASLR kernel: ASLR bypass for setuid binaries due to late install_exec_creds() kernel: sensitive information disclosure from kernel stack memory via HIDPCONNADD command kernel: unchecked kstrdup of fwstr in drm_load_edid_firmware leads to denial of service kernel: use-after-free in arch/x86/lib/insn-eval.c kernel: integer overflow and OOB read in drivers/block/floppy.c kernel: heap-overflow in mwifiex_set_wmm_params() function of Marvell WiFi driver leading to DoS kernel: Null pointer dereference in the sound/usb/line6/pcm.c kernel: memory leak in register_queue_kobjects() in net/core/net-sysfs.c leads to denial of service kernel: buffer-overflow hardening in WiFi beacon validation code.

Affected: Ubuntu:14.04:LTS: linux-lts-xenial, Ubuntu:Pro:14.04:LTS: linux, Ubuntu:16.04:LTS: linux, Ubuntu:16.04:LTS: linux-raspi2, Ubuntu:16.04:LTS: linux-snapdragon, Ubuntu:20.04:LTS: linux-azure-fde, Ubuntu:Pro:20.04:LTS: linux-azure-fde-5.15, Ubuntu:20.04:LTS: linux-gke, Ubuntu:20.04:LTS: linux-gkeop, Ubuntu:20.04:LTS: linux-gkeop-5.15 and 10 more

A race condition in perf_event_open() allows local attackers to leak sensitive data from setuid programs. As no relevant locks (in particular the cred_guard_mutex) are held during the ptrace_may_access() call, it is possible for the specified target task to perform an execve() syscall with setuid execution before perf_event_alloc() actually attaches to it, allowing an attacker to bypass the ptrace_may_access() check and the perf_event_exit_task(current) call that is performed in install_exec_creds() during privileged execve() calls. This issue affects kernel versions before 4.8.