SB20220201104 - Slackware Linux update for kernel
Published: February 1, 2022 Updated: June 28, 2025
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 35 secuirty vulnerabilities.
1) Buffer overflow (CVE-ID: CVE-2022-0330)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a random memory access flaw caused by a missing TLB flush in Linux kernel GPU i915 kernel driver functionality. A local user can execute arbitrary code on the system with elevated privileges.
2) Use-after-free (CVE-ID: CVE-2021-38204)
The vulnerability allows a local attacker to perform a denial of service attack.
The vulnerability exists due to a use-after-free error in the drivers/usb/host/max3421-hcd.c in the Linux kernel. An attacker with physical access to the system can remove a MAX-3421 USB device to perform a denial of service attack.
3) Resource exhaustion (CVE-ID: CVE-2021-3679)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to lack of CPU resource in the Linux kernel tracing module functionality when using trace ring buffer in a specific way. A privileged local user (with CAP_SYS_ADMIN capability) could use this flaw to starve the resources causing denial of service.
4) Out-of-bounds write (CVE-ID: CVE-2021-37576)
The vulnerability allows a remote user to escalate privileges on the system.
The vulnerability exists due to a boundary error in arch/powerpc/kvm/book3s_rtas.c in the Linux kernel through 5.13.5 on the powerpc platform. An attacker on KVM guest OS can cause host OS memory corruption via rtas_args.nargs and execute arbitrary code on the host OS.
5) Use-after-free (CVE-ID: CVE-2021-0920)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the unix_scm_to_skb() function of af_unix.c in Linux kernel. A local user can run a specially crafted program to trigger a race condition and execute arbitrary code with elevated privileges.
6) Information disclosure (CVE-ID: CVE-2021-21781)
The vulnerability allows a local user to gain access to potentially sensitive information.
The vulnerability exists due to excessive data output in the ARM SIGPAGE functionality. A userland application can read the contents of the sigpage, which can leak kernel memory contents.
7) Access of uninitialized pointer (CVE-ID: CVE-2021-38205)
The vulnerability allows a local user to manipulate data.
drivers/net/ethernet/xilinx/xilinx_emaclite.c in the Linux kernel before 5.13.3 makes it easier for attackers to defeat an ASLR protection mechanism because it prints a kernel pointer (i.e., the real IOMEM pointer).
8) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2021-3732)
The vulnerability allows a local user to gain access to sensitive information.
The vulnerability exists in the way the user mounts the TmpFS filesystem with OverlayFS. A local user can gain access to hidden files that should not be accessible.
9) Security restrictions bypass (CVE-ID: CVE-2021-3653)
The vulnerability allows a malicious guest to escalate privileges on the system.
The vulnerability exists due to improperly imposed security restrictions within the KVM's AMD code for supporting SVM nested virtualization. The flaw occurs when processing the VMCB (virtual machine control block) provided by the L1 guest to spawn/handle a nested guest (L2). Due to improper validation of the "int_ctl" field, this issue could allow a malicious L1 to enable AVIC support (Advanced Virtual Interrupt Controller) for the L2 guest.
As a result, the L2 guest would be allowed to read/write physical pages of the host, resulting in a crash of the entire system, leak of sensitive data or potential guest-to-host escape.
10) Out-of-bounds write (CVE-ID: CVE-2021-42008)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error in the decode_data() function in drivers/net/hamradio/6pack.c in the Linux kernel. A local user can send input from a process that has the CAP_NET_ADMIN capability and escalate privileges on the system.
11) Out-of-bounds read (CVE-ID: CVE-2021-3753)
The vulnerability allows a local user to gain access to potentially sensitive information.
The vulnerability exists due to a boundary condition in the vt_k_ioctl in drivers/tty/vt/vt_ioctl.c in the Linux kernel. A local user can trigger out-of-bounds read error and read contents of memory on the system.
12) Race condition (CVE-ID: CVE-2021-40490)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a race condition in ext4_write_inline_data_end in fs/ext4/inline.c in the ext4 subsystem in the Linux kernel. A local user can exploit the race and gain unauthorized access to sensitive information and escalate privileges on the system.
13) Cryptographic Issues (CVE-ID: CVE-2020-3702)
The vulnerability allows a remote attacker to gain access top sensitive information.
The vulnerability exists due to improper input validation in WIFI driver(Krook). A remote attacker can temporary disable WPA2 or the WPA/WPA2 mixed-mode encryption and intercept traffic in clear text.
14) Input validation error (CVE-ID: CVE-2021-20320)
The vulnerability allows a local user to gain access to sensitive information.
A flaw was found in s390 eBPF JIT in bpf_jit_insn in arch/s390/net/bpf_jit_comp.c in the Linux kernel. In this flaw, a local attacker with special user privilege can circumvent the verifier and may lead to a confidentiality problem.
15) Missing initialization of resource (CVE-ID: CVE-2021-3655)
The vulnerability allows a remote attacker to gain access to sensitive information.
The vulnerability exists due to missing initialization of resource in the Linux kernel when processing inbound SCTP packets. A remote attacker can send specially crafted SCTP packets to the system and force the kernel to read uninitialized memory.
16) Use-after-free (CVE-ID: CVE-2021-4203)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error in sock_getsockopt() function in net/core/sock.c due to SO_PEERCRED and SO_PEERGROUPS race with listen() function (and connect() function) in the Linux kernel. A local user can exploit the use-after-free error and crash the system or escalate privileges on the system.
17) Race condition (CVE-ID: CVE-2020-29374)
The vulnerability allows a local user to gain access to sensitive information.
The vulnerability exists due to a race condition in the mm/gup.c and mm/huge_memory.c in Linux kernel. A local user can exploit the race and gain unauthorized access to sensitive information.
18) Race condition (CVE-ID: CVE-2021-20321)
The vulnerability allows a local user to perform a denial of service (DoS) attacks.
The vulnerability exists due to a race condition when accessing file object in the Linux kernel OverlayFS subsystem. A local user can rename files in specific way with OverlayFS and perform a denial of service (DoS) attack.
19) Use-after-free (CVE-ID: CVE-2021-3760)
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 stack. A local user can trigger use-after-free error to escalate privileges on the system.
20) Improper Validation of Array Index (CVE-ID: CVE-2021-43389)
The vulnerability allows a local user to execute arbitrary code with elevated privileges.The vulnerability exists due to improper validation of array index in the ISDN CAPI implementation within detach_capi_ctr() function in drivers/isdn/capi/kcapi.c. A local user can send specially crafted data to the system and execute arbitrary code with elevated privileges.
21) Insufficient verification of data authenticity (CVE-ID: CVE-2021-3772)
The vulnerability allows a remote attacker to perform a denial of service attack (DoS) on the target system.The vulnerability exists due to insufficient verification of data authenticity in the Linux SCTP stack. A remote attacker can exploit this vulnerability to perform a denial of service attack.
22) Double Free (CVE-ID: CVE-2021-37159)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to hso_free_net_device() function in drivers/net/usb/hso.c in the Linux kernel calls unregister_netdev without checking for the NETREG_REGISTERED state. A local user can trigger double free and use-after-free errors and execute arbitrary code with elevated privileges.
23) Use-after-free (CVE-ID: CVE-2021-4202)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error in the nci_request() function in net/nfc/nci/core.c in NFC Controller Interface (NCI) in the Linux kernel. A local user can cause a data race problem while the device is getting removed and escalate privileges on the system.
24) Use-after-free (CVE-ID: CVE-2021-3752)
The vulnerability allows a remote attacker to escalate privileges on the system.
The vulnerability exists due to a use-after-free error in the Linux kernel’s Bluetooth subsystem when a user calls connect to the socket and disconnect simultaneously. A local user can escalate privileges on the system.
25) Use-after-free (CVE-ID: CVE-2021-3640)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error in sco_sock_sendmsg() function of the Linux kernel HCI subsystem. A privileged local user can call ioct UFFDIO_REGISTER or other way trigger race condition to escalate privileges on the system.
26) Memory leak (CVE-ID: CVE-2021-4002)
The vulnerability allows a local user to gain access to sensitive information.
The vulnerability exists due memory leak in the Linux kernel's hugetlbfs memory usage. A local user can force the application to leak memory and gain access to sensitive information.
27) Use-after-free (CVE-ID: CVE-2021-4083)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the Linux kernel's garbage collection for Unix domain socket file handlers. A local user can call close() and fget() simultaneously and can potentially trigger a race condition, which in turn leads to a use-after-free error and allows privilege escalation.
28) Buffer overflow (CVE-ID: CVE-2021-39685)
The vulnerability allows a malicious host to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error within the USB subsystem in Linux kernel. A malicious USB device can trigger memory corruption and execute arbitrary code on the system.
29) Improper Resource Shutdown or Release (CVE-ID: CVE-2021-28715)
The vulnerability allows a remote user to perform a denial of service (DoS) attack.
The vulnerability exists due to incoming data packets for a guest in the Linux kernel's netback driver are buffered until the guest is ready to process them. A remote user can use a UDP connection on a fast interface to trigger resource exhaustion and perform a denial of service (DoS) attack.
30) Resource exhaustion (CVE-ID: CVE-2021-28713)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to improper limits for number of events driver domains could send to other guest VMs. A local user can trigger resource exhaustion and perform a denial of service (DoS) attack.
31) Resource exhaustion (CVE-ID: CVE-2021-28712)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to improper limits for number of events driver domains could send to other guest VMs. A local user can trigger resource exhaustion and perform a denial of service (DoS) attack.
32) Resource exhaustion (CVE-ID: CVE-2021-28711)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to improper limits for number of events driver domains could send to other guest VMs. A local user can trigger resource exhaustion and perform a denial of service (DoS) attack.
33) Information disclosure (CVE-ID: CVE-2021-45095)
The vulnerability allows a local user to gain access to potentially sensitive information.
The vulnerability exists due to a refcount leak within the pep_sock_accept() function in net/phonet/pep.c in the Linux kernel. A local user can gain unauthorized access to sensitive information on the system.
34) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2021-4155)
The vulnerability allows a local user to bypass implemented security restrictions.
The vulnerability exists due to the OS kernel does not impose correctly security restrictions. A local user can gain access to sensitive information on the system.
35) Input validation error (CVE-ID: CVE-2021-43976)
The vulnerability allows an attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to insufficient validation of user-supplied input within the mwifiex_usb_recv() function in drivers/net/wireless/marvell/mwifiex/usb.c in Linux kernel. An attacker with physical access to the system can insert a specially crafted USB device and perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.