Red Hat Enterprise Linux 6 Extended Lifecycle Support update for kernel
| Risk | Low |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2021-22543 |
| CWE-ID | CWE-119 |
| Exploitation vector | Local |
| Public exploit | Public exploit code for vulnerability #1 is available. |
| Vulnerable software Subscribe |
kernel (Red Hat package) Operating systems & Components / Operating system package or component Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) Operating systems & Components / Operating system Red Hat Enterprise Linux Server - Extended Life Cycle Support Operating systems & Components / Operating system |
| Vendor | Red Hat Inc. |
Security Bulletin
This security bulletin contains one low risk vulnerability.
1) Buffer overflow
EUVDB-ID: #VU56018
Risk: Low
CVSSv3.1: 7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]
CVE-ID: CVE-2021-22543
CWE-ID:
CWE-119 - Memory corruption
Exploit availability: Yes
DescriptionThe vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error in Linux kernel when handling VM_IO|VM_PFNMAP vmas in KVM. A local user can can bypass RO checks and cause the pages to get freed while still accessible by the VMM and guest. As a result, an attacker with the ability to start and control a VM to read/write random pages of memory, can trigger memory corruption and execute arbitrary code with elevated privileges.
Install updates from vendor's website.
kernel (Red Hat package): 2.6.32-71.7.1.el6 - 2.6.32-754.47.1.el6
Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems): 6.0
Red Hat Enterprise Linux Server - Extended Life Cycle Support: 6.0
CPE2.3- cpe:2.3:o:red_hat:kernel_redhat_package:2.6.32-754.47.1.el6:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:kernel_redhat_package:2.6.32-754.43.1.el6:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:kernel_redhat_package:2.6.32-754.41.2.el6:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:red hat enterprise linux server - extended life cycle support (for ibm z systems):6.0:*:*:*:*:red_hat_enterprise_linux:*:
- cpe:2.3:o:red_hat:red hat enterprise linux server - extended life cycle support:6.0:*:*:*:*:red_hat_enterprise_linux:*:
http://access.redhat.com/errata/RHSA-2022:5640
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. However, proof of concept for this vulnerability is available.
