Red Hat Enterprise Linux 7 update for kernel-rt
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 5 |
| CVE-ID | CVE-2019-20934 CVE-2020-11668 CVE-2021-33033 CVE-2021-33034 CVE-2021-33909 |
| CWE-ID | CWE-416 CWE-476 CWE-190 |
| Exploitation vector | Local |
| Public exploit | Public exploit code for vulnerability #5 is available. |
| Vulnerable software Subscribe |
kernel-rt (Red Hat package) Operating systems & Components / Operating system package or component Red Hat Enterprise Linux for Real Time Operating systems & Components / Operating system Red Hat Enterprise Linux for Real Time for NFV Operating systems & Components / Operating system |
| Vendor | Red Hat Inc. |
Security Bulletin
This security bulletin contains information about 5 vulnerabilities.
1) Use-after-free
EUVDB-ID: #VU55260
Risk: Low
CVSSv3.1:
CVE-ID: CVE-2019-20934
CWE-ID:
Exploit availability:
DescriptionThe vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error in Linux fair scheduler within the show_numa_stats() function, caused by improperly freed NUMA fault statistics. A local user can trigger a use-after-free error and escalate privileges on the system.
Install updates from vendor's website.
kernel-rt (Red Hat package): 3.10.0-229.1.2.rt56.141.2.el7_1 - 3.10.0-1160.31.1.rt56.1169.el7
Red Hat Enterprise Linux for Real Time: 7
Red Hat Enterprise Linux for Real Time for NFV: 7
Fixed software versionsCPE2.3 External links
http://access.redhat.com/errata/RHSA-2021:2726
Q & A
Can this vulnerability be exploited remotely?
Is there known malware, which exploits this vulnerability?
2) NULL pointer dereference
EUVDB-ID: #VU27875
Risk: Low
CVSSv3.1:
CVE-ID: CVE-2020-11668
CWE-ID:
Exploit availability:
DescriptionThe vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error within the drivers/media/usb/gspca/xirlink_cit.c in Xirlink camera USB driver. A local user can pass specially crafted data to the driver and perform a denial of service (DoS) attack.
MitigationInstall updates from vendor's website.
kernel-rt (Red Hat package): 3.10.0-229.1.2.rt56.141.2.el7_1 - 3.10.0-1160.31.1.rt56.1169.el7
Red Hat Enterprise Linux for Real Time: 7
Red Hat Enterprise Linux for Real Time for NFV: 7
Fixed software versionsCPE2.3 External links
http://access.redhat.com/errata/RHSA-2021:2726
Q & A
Can this vulnerability be exploited remotely?
Is there known malware, which exploits this vulnerability?
3) Use-after-free
EUVDB-ID: #VU55261
Risk: Low
CVSSv3.1:
CVE-ID: CVE-2021-33033
CWE-ID:
Exploit availability:
DescriptionThe vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to improper handling of the CIPSO and CALIPSO refcounting for the DOI definitions in cipso_v4_genopt(0 function in net/ipv4/cipso_ipv4.c in Linux kernel. A local user can trigger a use-after-free error and execute arbitrary code with escalated privileges.
Install updates from vendor's website.
kernel-rt (Red Hat package): 3.10.0-229.1.2.rt56.141.2.el7_1 - 3.10.0-1160.31.1.rt56.1169.el7
Red Hat Enterprise Linux for Real Time: 7
Red Hat Enterprise Linux for Real Time for NFV: 7
Fixed software versionsCPE2.3 External links
http://access.redhat.com/errata/RHSA-2021:2726
Q & A
Can this vulnerability be exploited remotely?
Is there known malware, which exploits this vulnerability?
4) Use-after-free
EUVDB-ID: #VU54454
Risk: Low
CVSSv3.1:
CVE-ID: CVE-2021-33034
CWE-ID:
Exploit availability:
DescriptionThe vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error in net/bluetooth/hci_event.c when destroying an hci_chan. A local user can escalate privileges on the system.
Install updates from vendor's website.
kernel-rt (Red Hat package): 3.10.0-229.1.2.rt56.141.2.el7_1 - 3.10.0-1160.31.1.rt56.1169.el7
Red Hat Enterprise Linux for Real Time: 7
Red Hat Enterprise Linux for Real Time for NFV: 7
Fixed software versionsCPE2.3 External links
http://access.redhat.com/errata/RHSA-2021:2726
Q & A
Can this vulnerability be exploited remotely?
Is there known malware, which exploits this vulnerability?
5) Integer overflow
EUVDB-ID: #VU55143
Risk: Low
CVSSv3.1:
CVE-ID: CVE-2021-33909
CWE-ID:
Exploit availability:
DescriptionThe vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to integer overflow during size_t-to-int conversion when creating, mounting, and deleting a deep directory structure whose total path length exceeds 1GB. An unprivileged local user can write up to 10-byte string to an offset of exactly -2GB-10B below the beginning of a vmalloc()ated kernel buffer.
Successful exploitation of vulnerability may allow an attacker to exploit the our-of-bounds write vulnerability to execute arbitrary code with root privileges.
Install updates from vendor's website.
kernel-rt (Red Hat package): 3.10.0-229.1.2.rt56.141.2.el7_1 - 3.10.0-1160.31.1.rt56.1169.el7
Red Hat Enterprise Linux for Real Time: 7
Red Hat Enterprise Linux for Real Time for NFV: 7
Fixed software versionsCPE2.3 External links
http://access.redhat.com/errata/RHSA-2021:2726
Q & A
Can this vulnerability be exploited remotely?
Is there known malware, which exploits this vulnerability?
