Red Hat update for kernel
| Risk | Low |
| Patch available | YES |
| Number of vulnerabilities | 2 |
| CVE-ID | CVE-2018-17182 CVE-2018-18021 |
| CWE-ID | CWE-416 CWE-20 |
| Exploitation vector | Local |
| Public exploit | N/A |
| Vulnerable software Subscribe |
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 Red Hat Enterprise Linux for ARM 64 Operating systems & Components / Operating system kernel-alt (Red Hat package) Operating systems & Components / Operating system package or component |
| Vendor |
Red Hat Inc. |
Security Bulletin
This security bulletin contains information about 2 vulnerabilities.
1) Use-after-free
EUVDB-ID: #VU14817
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-2018-17182
CWE-ID:
CWE-416 - Use After Free
Exploit availability: No
DescriptionThe vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error in vmacache_flush_all() function in mm/vmacache.c file. A local user can trigger the use-after-free error via certain thread creation, map, unmap, invalidation, and dereference operations and execute arbitrary code on the system with elevated privileges.
MitigationInstall update from vendor's website.
Vulnerable software versionsRed Hat Enterprise Linux for IBM System z (Structure A): 7.0
Red Hat Enterprise Linux for Power 9: 7.0
Red Hat Enterprise Linux for ARM 64: 7.0
kernel-alt (Red Hat package): 4.14.0-49.2.2.el7a - 4.14.0-49.el7a
:
External linkshttp://access.redhat.com/errata/RHSA-2018:3656
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.
2) Improper input validation
EUVDB-ID: #VU15177
Risk: Low
CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2018-18021
CWE-ID:
CWE-20 - Improper input validation
Exploit availability: No
DescriptionThe vulnerability allows a local attacker to cause DoS condition on the target system.
The vulnerability exists in the arch/arm64/kvm/guest.c source code file due to the mishandling of the sanity check for the KVM_SET_ON_REG IOCTL function. A local attacker can create a malicious Kernel-based Virtual Machine (KVM), cause an illegal exception return and cause the system to crash.
MitigationInstall update from vendor's website.
Vulnerable software versionsRed Hat Enterprise Linux for IBM System z (Structure A): 7.0
Red Hat Enterprise Linux for Power 9: 7.0
Red Hat Enterprise Linux for ARM 64: 7.0
kernel-alt (Red Hat package): 4.14.0-49.2.2.el7a - 4.14.0-49.el7a
:
External linkshttp://access.redhat.com/errata/RHSA-2018:3656
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.
