Rewterz Threat Advisory – Multiple Linux Kernel Vulnerabilities

Severity

High

Analysis Summary

CVE-2022-47939 CVSS:10

Linux Kernel could allow a remote attacker to execute arbitrary code on the system, caused by a use-after-free flaw in ksmbd in fs/ksmbd/smb2pdu.c. By sending a specially-crafted request, an attacker could exploit this vulnerability to execute arbitrary code on the system.

CVE-2022-47938 CVSS:4.3

Linux Kernel is vulnerable to a denial of service, caused by an out-of-bounds read flaw in ksmbd in fs/ksmbd/smb2misc.c. By sending a specially-crafted request, a remote authenticated attacker could exploit this vulnerability to cause a denial of service condition.

CVE-2022-47946 CVSS:6.2

Linux Kernel is vulnerable to a denial of service, caused by a use-after-free flaw in the io_sqpoll_wait_sq function. By sending a specially-crafted request, a local attacker could exploit this vulnerability to cause the system crash.

CVE-2022-47943 CVSS:9.6

Linux Kernel could allow a remote authenticated attacker to obtain sensitive information, caused by an out-of-bounds read flaw in ksmbd when there is a large length in the zero DataOffset case. By sending a specially-crafted request, an attacker could exploit this vulnerability to obtain sensitive information or cause a denial of service condtion.

CVE-2022-47942 CVSS:8.5

Linux Kernel is vulnerable to a heap-based buffer overflow, caused by improper bounds checking by the set_ntacl_dacl function in ksmbd. By sending a specially-crafted request, a remote authenticated attacker could overflow a buffer and execute arbitrary code on the system.

CVE-2022-47941 CVSS:5.3

Linux Kernel is vulnerable to a denial of service, caused by a memory leak flaw in ksmbd in fs/ksmbd/smb2pdu.c. By sending a specially-crafted request, a remote attacker could exploit this vulnerability to cause a denial of service condition.

CVE-2022-47940 CVSS:8.1

Linux Kernel could allow a remote authenticated attacker to obtain sensitive information, caused by an out-of-bounds read flaw in ksmbd in fs/ksmbd/smb2pdu.c. By sending a specially-crafted request, an attacker could exploit this vulnerability to obtain sensitive information, and use this information to launch further attacks against the affected system.

Impact

• Denial of Service
• Information Disclosure
• Buffer Overflow

Indicators Of Compromise

CVE

• CVE-2022-47939
• CVE-2022-47938
• CVE-2022-47946
• CVE-2022-47943
• CVE-2022-47942
• CVE-2022-47941
• CVE-2022-47940

Affected Vendors

Linux

Affected Products

• Linux Kernel 5.10
• Linux Kernel 5.15
• Linux Kernel 5.18
• Linux Kernel 5.19

Remediation

Refer to Linux Kernel GIT Repository for patch, upgrade or suggested workaround information.

CVE-2022-47939

CVE-2022-47938

CVE-2022-47946

CVE-2022-47943

CVE-2022-47942

CVE-2022-47941

CVE-2022-47940