CWE
190 416 362
Advisory Published

USN-5218-1: Linux kernel (OEM) vulnerabilities

First published: Tue Jan 11 2022(Updated: )

Nadav Amit discovered that the hugetlb implementation in the Linux kernel did not perform TLB flushes under certain conditions. A local attacker could use this to leak or alter data from other processes that use huge pages. (CVE-2021-4002) It was discovered that the eBPF implementation in the Linux kernel did not properly validate the memory size of certain ring buffer operation arguments. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-4204) It was discovered that a race condition existed in the overlay file system implementation in the Linux kernel. A local attacker could use this to cause a denial of service (system crash). (CVE-2021-20321) It was discovered that the NFC subsystem in the Linux kernel contained a use-after-free vulnerability in its NFC Controller Interface (NCI) implementation. A local attacker could possibly use this to cause a denial of service (system crash) or execute arbitrary code. (CVE-2021-3760) It was discovered that an integer overflow could be triggered in the eBPF implementation in the Linux kernel when preallocating objects for stack maps. A privileged local attacker could use this to cause a denial of service or possibly execute arbitrary code. (CVE-2021-41864) It was discovered that the KVM implementation for POWER8 processors in the Linux kernel did not properly keep track if a wakeup event could be resolved by a guest. An attacker in a guest VM could possibly use this to cause a denial of service (host OS crash). (CVE-2021-43056) It was discovered that the TIPC Protocol implementation in the Linux kernel did not properly validate MSG_CRYPTO messages in some situations. An attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-43267) It was discovered that the ISDN CAPI implementation in the Linux kernel contained a race condition in certain situations that could trigger an array out-of-bounds bug. A privileged local attacker could possibly use this to cause a denial of service or execute arbitrary code. (CVE-2021-43389)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/linux-image-oem-20.04c<5.13.0.1026.29
5.13.0.1026.29
=20.04
All of
ubuntu/linux-image-5.13.0-1026-oem<5.13.0-1026.32
5.13.0-1026.32
=20.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID for this advisory?

    The vulnerability ID for this advisory is CVE-2021-4002.

  • What is the severity of CVE-2021-4002?

    The severity of CVE-2021-4002 is not mentioned in the advisory.

  • How can a local attacker exploit CVE-2021-4002?

    A local attacker can exploit CVE-2021-4002 to leak or alter data from other processes that use huge pages.

  • What is the remedy for CVE-2021-4002?

    The remedy for CVE-2021-4002 is to update to version 5.13.0.1026.29 of the linux-image-oem-20.04c package.

  • Are there any additional references for CVE-2021-4002?

    Yes, you can find additional references for CVE-2021-4002 at the following URLs: [link 1](https://ubuntu.com/security/CVE-2021-41864), [link 2](https://ubuntu.com/security/CVE-2021-4002), [link 3](https://ubuntu.com/security/CVE-2021-43267).

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