SB2021041391 - SUSE update for the Linux Kernel
Published: April 13, 2021
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 21 secuirty vulnerabilities.
1) Use-after-free (CVE-ID: CVE-2019-18814)
The vulnerability allows a local user to compromise vulnerable system.
The vulnerability exists due to a use-after-free error when "aa_label_parse()" fails in "aa_audit_rule_init()" in security/apparmor/audit.c. A local user can execute arbitrary code on the target system.
Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.
2) Use-after-free (CVE-ID: CVE-2019-19769)
The vulnerability allows a local privileged user to execute arbitrary code.
In the Linux kernel 5.3.10, there is a use-after-free (read) in the perf_trace_lock_acquire function (related to include/trace/events/lock.h).
3) Observable discrepancy (CVE-ID: CVE-2020-27170)
The vulnerability allows a local user to gain access to sensitive information.
The vulnerability exists in kernel/bpf/verifier.c due to kernel performs undesirable out-of-bounds speculation on
pointer arithmetic, leading to side-channel attacks that defeat Spectre
mitigations. A local user can run a specially crafted program to gain access to sensitive information.
4) Off-by-one (CVE-ID: CVE-2020-27171)
The vulnerability allows a local user to gain access to sensitive information.
The vulnerability exists due to an off-by-one error in kernel/bpf/verifier.c affecting out-of-bounds speculation on pointer arithmetic, leading to side-channel attacks that defeat Spectre mitigations. A local user can run a specially crafted program to gain access to sensitive information on the system.
5) Out-of-bounds read (CVE-ID: CVE-2020-27815)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary condition in fs/jfs/jfs_dmap.c. A local user can trigger out-of-bounds read error and crash the kernel.
6) Out-of-bounds read (CVE-ID: CVE-2020-35519)
The vulnerability allows a local user to gain access to potentially sensitive information.
The vulnerability exists due to a boundary condition within the x25_bind() function in net/x25/af_x25.c in the Linux kernel. A local user can run a specially crafted program to read contents of memory on the system.
7) Information disclosure (CVE-ID: CVE-2021-27363)
The vulnerability allows a local user to gain access to potentially sensitive information.
The vulnerability exists due to the show_transport_handle() shows iSCSI transport handle to non-root users. A local user can gain unauthorized access to sensitive information and use it along with another vulnerability, such as #VU51452, to escalate privileges on the system.
8) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2021-27364)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to iscsi_if_recv_msg() allows non-root users to connect and send commands to the Linux kernel. A local user can escalate privileges on the system.
9) Buffer overflow (CVE-ID: CVE-2021-27365)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error when processing Netlink messages in Linux kernel through 5.11.3, as certain iSCSI data structures do not have appropriate length constraints or checks, and can exceed the PAGE_SIZE value. A local unprivileged user can send a Netlink message that is associated with iSCSI, and has a length up to the maximum length of a Netlink message, trigger memory corruption and execute arbitrary code on the system with elevated privileges.
10) Allocation of resources without limits or throttling (CVE-ID: CVE-2021-28038)
The vulnerability allows a local user to a crash the entire system.
The vulnerability exists due to allocation of resources without limits or throttling error within the xenvif_tx_action() function in drivers/net/xen-netback/netback.c. A local user can a crash the entire system.
11) Missing authorization (CVE-ID: CVE-2021-28375)
The vulnerability allows a local user to execute arbitrary code.
The vulnerability exists due to missing authorization error within the fastrpc_internal_invoke() function in drivers/misc/fastrpc.c. A local user can execute arbitrary code.
12) Out-of-bounds write (CVE-ID: CVE-2021-28660)
The vulnerability allows a local user to compromise vulnerable system.
The vulnerability exists due to a boundary error when processing untrusted input in the "rtw_wx_set_scan" in drivers/staging/rtl8188eu/os_dep/ioctl_linux.c. A local user can trigger out-of-bounds write and execute arbitrary code on the target system.
13) 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.
14) 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.
15) 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.
16) 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.
17) 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.
18) Race condition (CVE-ID: CVE-2021-29265)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to a race condition within the usbip_sockfd_store() function in drivers/usb/usbip/stub_dev.c. A local user can perform a denial of service (DoS) attack.
19) 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.
20) Integer overflow (CVE-ID: CVE-2021-3428)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to integer overflow in fs/ext4/extents.c in ext4_es_cache_extent() function, if an extent tree is corrupted in a crafted ext4 filesystem. A local user can mount a specially crafted filesystem and perform a denial of service (DoS) attack.
21) Out-of-bounds read (CVE-ID: CVE-2021-3444)
The vulnerability allows a local user to execute arbitrary code.
The vulnerability exists due to an out-of-bounds read error within the fixup_bpf_calls() function in kernel/bpf/verifier.c. A local user can execute arbitrary code.
Remediation
Install update from vendor's website.