Red Hat Enterprise Linux 7 update for kernel

Published: 2020-05-27 | Updated: 2025-04-24

Risk	High
Patch available	YES
Number of vulnerabilities	5
CVE-ID	CVE-2017-18595 CVE-2019-3846 CVE-2019-10126 CVE-2019-19768 CVE-2020-10711
CWE-ID	CWE-415 CWE-119 CWE-122 CWE-416 CWE-476
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	Red Hat Enterprise Linux for x86_64 - Extended Update Support Operating systems & Components / Operating system Red Hat Virtualization Host - Extended Update Support 4.2 for RHEL Operating systems & Components / Operating system Red Hat Enterprise Linux Server - TUS Operating systems & Components / Operating system Red Hat Enterprise Linux for Power, little endian - Extended Update Support Operating systems & Components / Operating system Red Hat Enterprise Linux EUS Compute Node Operating systems & Components / Operating system Red Hat Enterprise Linux for Power, big endian - Extended Update Support Operating systems & Components / Operating system Red Hat Enterprise Linux for IBM z Systems - Extended Update Support Operating systems & Components / Operating system Red Hat Enterprise Linux Server - AUS Operating systems & Components / Operating system kernel (Red Hat package) Operating systems & Components / Operating system package or component
Vendor	Red Hat Inc.

Security Bulletin

This security bulletin contains information about 5 vulnerabilities.

1) Double Free

EUVDB-ID: #VU21716

Risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2017-18595

CWE-ID: CWE-415 - Double Free

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges in the system.

The vulnerability exists due to a boundary error within the allocate_trace_buffer() function in the kernel/trace/trace.c. A local user can run a specially crafted application to trigger a double free error and execute arbitrary code on the target system with elevated privileges.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for x86_64 - Extended Update Support: 7.6

Red Hat Virtualization Host - Extended Update Support 4.2 for RHEL: 7.6

Red Hat Enterprise Linux Server - TUS: 7.6

Red Hat Enterprise Linux for Power, little endian - Extended Update Support: 7.6

Red Hat Enterprise Linux EUS Compute Node: 7.6

Red Hat Enterprise Linux for Power, big endian - Extended Update Support: 7.6

Red Hat Enterprise Linux for IBM z Systems - Extended Update Support: 7.6

Red Hat Enterprise Linux Server - AUS: 7.6

kernel (Red Hat package): before 3.10.0-957.54.1.el7

CPE2.3

External links

https://access.redhat.com/errata/RHSA-2020:2289

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) Buffer overflow

EUVDB-ID: #VU28399

Risk: High

CVSSv4.0: 6.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2019-3846

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

A flaw that allowed an attacker to corrupt memory and possibly escalate privileges was found in the mwifiex kernel module while connecting to a malicious wireless network.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for x86_64 - Extended Update Support: 7.6

Red Hat Virtualization Host - Extended Update Support 4.2 for RHEL: 7.6

Red Hat Enterprise Linux Server - TUS: 7.6

Red Hat Enterprise Linux for Power, little endian - Extended Update Support: 7.6

Red Hat Enterprise Linux EUS Compute Node: 7.6

Red Hat Enterprise Linux for Power, big endian - Extended Update Support: 7.6

Red Hat Enterprise Linux for IBM z Systems - Extended Update Support: 7.6

Red Hat Enterprise Linux Server - AUS: 7.6

kernel (Red Hat package): before 3.10.0-957.54.1.el7

CPE2.3

External links

https://access.redhat.com/errata/RHSA-2020:2289

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

3) Heap-based buffer overflow

EUVDB-ID: #VU20810

Risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-10126

CWE-ID: CWE-122 - Heap-based Buffer Overflow

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) condition or execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in the Marvell Wireless LAN device driver in "mwifiex_uap_parse_tail_ies" function in "drivers/net/wireless/marvell/mwifiex/ie.c". A local authenticated user can trigger heap-based buffer overflow and cause a denial of service (system crash) or possibly execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for x86_64 - Extended Update Support: 7.6

Red Hat Virtualization Host - Extended Update Support 4.2 for RHEL: 7.6

Red Hat Enterprise Linux Server - TUS: 7.6

Red Hat Enterprise Linux for Power, little endian - Extended Update Support: 7.6

Red Hat Enterprise Linux EUS Compute Node: 7.6

Red Hat Enterprise Linux for Power, big endian - Extended Update Support: 7.6

Red Hat Enterprise Linux for IBM z Systems - Extended Update Support: 7.6

Red Hat Enterprise Linux Server - AUS: 7.6

kernel (Red Hat package): before 3.10.0-957.54.1.el7

CPE2.3

External links

https://access.redhat.com/errata/RHSA-2020:2289

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) Use-after-free

EUVDB-ID: #VU27503

Risk: Low

CVSSv4.0: 4.4 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-19768

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error in the __blk_add_trace() function in kernel/trace/blktrace.c. A local user can run a specially crafted program, trigger a use-after-free error and execute arbitrary code on the system with elevated privileges.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for x86_64 - Extended Update Support: 7.6

Red Hat Virtualization Host - Extended Update Support 4.2 for RHEL: 7.6

Red Hat Enterprise Linux Server - TUS: 7.6

Red Hat Enterprise Linux for Power, little endian - Extended Update Support: 7.6

Red Hat Enterprise Linux EUS Compute Node: 7.6

Red Hat Enterprise Linux for Power, big endian - Extended Update Support: 7.6

Red Hat Enterprise Linux for IBM z Systems - Extended Update Support: 7.6

Red Hat Enterprise Linux Server - AUS: 7.6

kernel (Red Hat package): before 3.10.0-957.54.1.el7

CPE2.3

External links

https://access.redhat.com/errata/RHSA-2020:2289

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.

5) NULL pointer dereference

EUVDB-ID: #VU28180

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-10711

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error in the Linux kernel's SELinux subsystem when importing the Commercial IP Security Option (CIPSO) protocol's category bitmap into the SELinux extensible bitmap via the' ebitmap_netlbl_import' routine. While processing the CIPSO restricted bitmap tag in the 'cipso_v4_parsetag_rbm' routine, it sets the security attribute to indicate that the category bitmap is present, even if it has not been allocated.

A remote attacker can send specially crafted packets the affected system, trigger a NULL pointer dereference error and crash the Linux kernel.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for x86_64 - Extended Update Support: 7.6

Red Hat Virtualization Host - Extended Update Support 4.2 for RHEL: 7.6

Red Hat Enterprise Linux Server - TUS: 7.6

Red Hat Enterprise Linux for Power, little endian - Extended Update Support: 7.6

Red Hat Enterprise Linux EUS Compute Node: 7.6

Red Hat Enterprise Linux for Power, big endian - Extended Update Support: 7.6

Red Hat Enterprise Linux for IBM z Systems - Extended Update Support: 7.6

Red Hat Enterprise Linux Server - AUS: 7.6

kernel (Red Hat package): before 3.10.0-957.54.1.el7

CPE2.3

External links

https://access.redhat.com/errata/RHSA-2020:2289

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.