Security Bulletin
This security bulletin contains one low risk vulnerability.
EUVDB-ID: #VU56393
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-2021-3715
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 the "Routing decision" classifier in the Linux kernel's Traffic Control networking subsystem (route4_change() function in net/sched/cls_route.c) in the way it handled changing of classification filters. A local user can trigger a use-after-free error and execute arbitrary code with elevated privileges.
Install updates from vendor's website.
kpatch-patch-3_10_0-1160_6_1 (Red Hat package): 1-3.el7 - 1-8.el7
kpatch-patch-3_10_0-1160_36_2 (Red Hat package): 1-1.el7
kpatch-patch-3_10_0-1160_31_1 (Red Hat package): 1-1.el7 - 1-2.el7
kpatch-patch-3_10_0-1160_2_2 (Red Hat package): 1-3.el7 - 1-8.el7
kpatch-patch-3_10_0-1160_2_1 (Red Hat package): 1-3.el7 - 1-8.el7
kpatch-patch-3_10_0-1160_25_1 (Red Hat package): 1-1.el7 - 1-3.el7
kpatch-patch-3_10_0-1160_24_1 (Red Hat package): 1-1.el7 - 1-3.el7
kpatch-patch-3_10_0-1160_21_1 (Red Hat package): 1-2.el7 - 1-5.el7
kpatch-patch-3_10_0-1160_15_2 (Red Hat package): 1-2.el7 - 1-7.el7
kpatch-patch-3_10_0-1160_11_1 (Red Hat package): 1-2.el7 - 1-7.el7
kpatch-patch-3_10_0-1160 (Red Hat package): 1-3.el7 - 1-8.el7
Red Hat Enterprise Linux for Power, little endian: 7
Red Hat Enterprise Linux Server: 7
kpatch-patch-3_10_0-1160_41_1 (Red Hat package): before 1-1.el7
External linkshttp://access.redhat.com/errata/RHSA-2021:3441
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.