SB2021051157 - Ubuntu update for linux-oem-5.10
Published: May 11, 2021
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 21 secuirty vulnerabilities.
1) Out-of-bounds read (CVE-ID: CVE-2021-3489)
The vulnerability allows a local user to execute arbitrary code.
The vulnerability exists due to an out-of-bounds read error within the __bpf_ringbuf_reserve() function in kernel/bpf/ringbuf.c. A local user can execute arbitrary code.
2) Out-of-bounds write (CVE-ID: CVE-2021-3490)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error when processing untrusted input in bpf. The eBPF ALU32 bounds tracking for bitwise ops (AND, OR and XOR) in the
Linux kernel did not properly update 32-bit bounds, which could be
turned into out of bounds reads and writes in the Linux kernel and
therefore, arbitrary code execution. A local user can run a specially crafted program to trigger an out-of-bounds write and execute arbitrary code with elevated privileges.
3) Out-of-bounds write (CVE-ID: CVE-2021-3491)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to the io_uring subsystem in the Linux kernel allowed the MAX_RW_COUNT limit to be bypassed in the PROVIDE_BUFFERS
operation, which led to negative values being used in mem_rw when reading
/proc/<PID>/mem. A local user can trigger a heap overflow and execute arbitrary code with elevated privileges.
4) Use-after-free (CVE-ID: CVE-2020-25670)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error in the NFC LLCP protocol implementation. A local user can perform manipulation with an unknown input for the llcp_sock_bind() function to crash or escalate their privileges on the system.
5) Use-after-free (CVE-ID: CVE-2020-25671)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error in the NFC LLCP protocol implementation. A local user can trigger the llcp_sock_connect() function to crash or escalate their privileges on the system.
6) Memory leak (CVE-ID: CVE-2020-25672)
The vulnerability allows a remote attacker to perform DoS attack on the target system.
The vulnerability exists due memory leak in the NFC LLCP protocol implementation when triggering the llcp_sock_connect() function. A remote attacker can force the application to leak memory and perform denial of service attack.
7) Improper Initialization (CVE-ID: CVE-2021-28688)
The vulnerability allows a local user to perform a denial of service attack.
The vulnerability exists due to improper initialization of pointers such that subsequent cleanup code wouldn't use uninitialized or stale values. A local user can perform a denial of service attack.
8) Improper locking (CVE-ID: CVE-2021-28951)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to improper locking within the io_sq_offload_start(), io_disable_sqo_submit() and io_register_enable_rings() functions in fs/io_uring.c. A local user can perform a denial of service (DoS) attack.
9) Buffer overflow (CVE-ID: CVE-2021-28952)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error in the sound/soc/qcom/sdm845.c soundwire device driver in Linux kernel. A local user can run a specially crafted program to trigger a buffer overflow, when an unexpected port ID number is encountered, and execute arbitrary code on the system with elevated privileges.
10) Race condition (CVE-ID: CVE-2021-28964)
The vulnerability allows a local user to perform a denial of service attack.
The vulnerability exists due to a race condition in the get_old_root() function in fs/btrfs/ctree.c component in the Linux kernel. A local user can exploit the race and perform a denial of service attack.
11) Resource exhaustion (CVE-ID: CVE-2021-28971)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to mishandling of PEBS status in a PEBS record In intel_pmu_drain_pebs_nhm in arch/x86/events/intel/ds.c in the Linux kernel. A local user can trigger resource exhaustion and perform a denial of service (DoS) attack.
12) Buffer overflow (CVE-ID: CVE-2021-28972)
The vulnerability allows a local user to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error in the drivers/pci/hotplug/rpadlpar_sysfs.c. A local administrator can trigger memory corruption and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
13) Input validation error (CVE-ID: CVE-2021-29264)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to improper input validation within the gfar_add_rx_frag() and gfar_clean_rx_ring() functions in drivers/net/ethernet/freescale/gianfar.c. A local user can perform a denial of service (DoS) attack.
14) Use-after-free (CVE-ID: CVE-2021-29266)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error in drivers/vhost/vdpa.c, because "v->config_ctx" has an invalid value upon re-opening a character device. A local user can trigger a use-after-free error and execute arbitrary code with elevated privileges.
15) Input validation error (CVE-ID: CVE-2021-29646)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to improper input validation within the tipc_nl_node_dump_monitor_peer() function in net/tipc/node.c. A local user can perform a denial of service (DoS) attack.
16) Information disclosure (CVE-ID: CVE-2021-29647)
The vulnerability allows a local user to gain access to potentially sensitive information.
The vulnerability exists due to an error in qrtr_recvmsg(0 function in net/qrtr/qrtr.c caused by a partially uninitialized data structure. A local user can read sensitive information from kernel memory.
17) Memory leak (CVE-ID: CVE-2021-29649)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to memory leak within the umd_cleanup() function in kernel/usermode_driver.c, within the finish() and load_umd() functions in kernel/bpf/preload/bpf_preload_kern.c. A local user can perform a denial of service (DoS) attack.
18) Buffer overflow (CVE-ID: CVE-2021-29650)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary error within the netfilter subsystem in net/netfilter/x_tables.c and include/linux/netfilter/x_tables.h. A local user can trigger memory corruption upon the assignment of a new table value and cause denial of service.
19) Use-after-free (CVE-ID: CVE-2021-29657)
The vulnerability allows a remote user to compromise vulnerable system.
The vulnerability exists due to a use-after-free error in arch/x86/kvm/svm/nested.c. An AMD KVM guest can bypass access control on host OS MSRs when there are nested guests and execute arbitrary code on the hypervisor.
20) Out-of-bounds write (CVE-ID: CVE-2021-31916)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error in list_devices in drivers/md/dm-ioctl.c in the Multi-device driver module. A special user (CAP_SYS_ADMIN) can trigger a buffer overflow in the ioctl for listing devices and escalate privileges on the system.
21) Use-after-free (CVE-ID: CVE-2021-3483)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error in the Nosy driver in the Linux kernel. A local user can trigger use-after-free and to escalate privileges on the system.
Remediation
Install update from vendor's website.