Red Hat Enterprise Linux 7 update for kernel-alt
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 4 |
| CVE-ID | CVE-2020-11669 CVE-2021-3347 CVE-2021-27364 CVE-2021-27365 |
| CWE-ID | CWE-399 CWE-416 CWE-264 CWE-119 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
kernel-alt (Red Hat package) Operating systems & Components / Operating system package or component Red Hat Enterprise Linux for IBM System z (Structure A) Operating systems & Components / Operating system Red Hat Enterprise Linux for Power 9 Operating systems & Components / Operating system |
| Vendor | Red Hat Inc. |
Security Bulletin
This security bulletin contains information about 4 vulnerabilities.
1) Resource management error
EUVDB-ID: #VU26992
Risk: Medium
CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2020-11669
CWE-ID:
CWE-399 - Resource Management Errors
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to resource management issue. A local user of guest operating system can perform a denial of service attack against the POWER9 KVM host.
Install updates from vendor's website.
kernel-alt (Red Hat package): 4.14.0-49.2.2.el7a - 4.14.0-115.19.1.el7a
Red Hat Enterprise Linux for IBM System z (Structure A): 7.0
Red Hat Enterprise Linux for Power 9: 7.0
External linkshttp://access.redhat.com/errata/RHSA-2021:1379
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
2) Use-after-free
EUVDB-ID: #VU52035
Risk: Low
CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-3347
CWE-ID:
CWE-416 - Use After Free
Exploit availability: No
DescriptionThe vulnerability allows a local user to elevate privileges on the system.
The vulnerability exists due to a use-after-free error when handling PI futexes. A local user can run a specially crafted program to trigger a use-after-free error and execute arbitrary code with elevated privileges.
Install updates from vendor's website.
kernel-alt (Red Hat package): 4.14.0-49.2.2.el7a - 4.14.0-115.19.1.el7a
Red Hat Enterprise Linux for IBM System z (Structure A): 7.0
Red Hat Enterprise Linux for Power 9: 7.0
External linkshttp://access.redhat.com/errata/RHSA-2021:1379
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
3) Permissions, Privileges, and Access Controls
EUVDB-ID: #VU51452
Risk: Low
CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-27364
CWE-ID:
CWE-264 - Permissions, Privileges, and Access Controls
Exploit availability: No
DescriptionThe 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.
Install updates from vendor's website.
kernel-alt (Red Hat package): 4.14.0-49.2.2.el7a - 4.14.0-115.19.1.el7a
Red Hat Enterprise Linux for IBM System z (Structure A): 7.0
Red Hat Enterprise Linux for Power 9: 7.0
External linkshttp://access.redhat.com/errata/RHSA-2021:1379
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
4) Buffer overflow
EUVDB-ID: #VU51451
Risk: Low
CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-27365
CWE-ID:
CWE-119 - Memory corruption
Exploit availability: No
DescriptionThe 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.
Install updates from vendor's website.
kernel-alt (Red Hat package): 4.14.0-49.2.2.el7a - 4.14.0-115.19.1.el7a
Red Hat Enterprise Linux for IBM System z (Structure A): 7.0
Red Hat Enterprise Linux for Power 9: 7.0
External linkshttp://access.redhat.com/errata/RHSA-2021:1379
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
