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CVE-2021-4002

Status Candidate

Overview

A memory leak flaw in the Linux kernel's hugetlbfs memory usage was found in the way the user maps some regions of memory twice using shmget() which are aligned to PUD alignment with the fault of some of the memory pages. A local user could use this flaw to get unauthorized access to some data.

Related Files

Red Hat Security Advisory 2022-4956-01
Posted Jun 9, 2022
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2022-4956-01 - Red Hat Advanced Cluster Management for Kubernetes 2.5.0 images Red Hat Advanced Cluster Management for Kubernetes provides the capabilities to address common challenges that administrators and site reliability engineers face as they work across a range of public and private cloud environments. Clusters and applications are all visible and managed from a single console—with security policy built in. This advisory contains the container images for Red Hat Advanced Cluster Management for Kubernetes, which fix several bugs and security issues. Issues addressed include privilege escalation and traversal vulnerabilities.

tags | advisory, vulnerability
systems | linux, redhat
advisories | CVE-2020-0404, CVE-2020-13974, CVE-2020-19131, CVE-2020-27820, CVE-2020-4788, CVE-2021-0941, CVE-2021-20322, CVE-2021-21781, CVE-2021-26401, CVE-2021-29154, CVE-2021-3612, CVE-2021-3634, CVE-2021-3669, CVE-2021-37159, CVE-2021-3737, CVE-2021-3743, CVE-2021-3744, CVE-2021-3752, CVE-2021-3759, CVE-2021-3764, CVE-2021-3772, CVE-2021-3773, CVE-2021-3918, CVE-2021-4002, CVE-2021-4037, CVE-2021-4083, CVE-2021-41190, CVE-2021-4157
SHA-256 | 878315e02041e8cdde9d1b5e67ed064f3cf0e6605b2eb860d63e94f3d703f519
Red Hat Security Advisory 2022-4814-01
Posted May 31, 2022
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2022-4814-01 - The Migration Toolkit for Containers enables you to migrate Kubernetes resources, persistent volume data, and internal container images between OpenShift Container Platform clusters, using the MTC web console or the Kubernetes API. Issues addressed include denial of service and memory exhaustion vulnerabilities.

tags | advisory, web, denial of service, vulnerability
systems | linux, redhat
advisories | CVE-2018-25032, CVE-2020-0404, CVE-2020-13974, CVE-2020-19131, CVE-2020-27820, CVE-2020-35492, CVE-2020-4788, CVE-2021-0941, CVE-2021-20322, CVE-2021-21781, CVE-2021-26401, CVE-2021-29154, CVE-2021-3612, CVE-2021-3634, CVE-2021-3669, CVE-2021-37159, CVE-2021-3737, CVE-2021-3743, CVE-2021-3744, CVE-2021-3752, CVE-2021-3759, CVE-2021-3764, CVE-2021-3772, CVE-2021-3773, CVE-2021-3807, CVE-2021-39293, CVE-2021-4002
SHA-256 | de3fa8ee040cf6c28c1affa37a50086f48d77a4fce95eaf6d26445098ef47a20
Red Hat Security Advisory 2022-1988-01
Posted May 11, 2022
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2022-1988-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. Issues addressed include buffer overflow, denial of service, information leakage, integer overflow, memory leak, out of bounds read, out of bounds write, privilege escalation, and use-after-free vulnerabilities.

tags | advisory, denial of service, overflow, kernel, vulnerability, memory leak
systems | linux, redhat
advisories | CVE-2020-0404, CVE-2020-13974, CVE-2020-27820, CVE-2020-4788, CVE-2021-0941, CVE-2021-20322, CVE-2021-21781, CVE-2021-26401, CVE-2021-29154, CVE-2021-3612, CVE-2021-3669, CVE-2021-37159, CVE-2021-3743, CVE-2021-3744, CVE-2021-3752, CVE-2021-3759, CVE-2021-3764, CVE-2021-3772, CVE-2021-3773, CVE-2021-4002, CVE-2021-4037, CVE-2021-4083, CVE-2021-4157, CVE-2021-41864, CVE-2021-4197, CVE-2021-4203, CVE-2021-42739, CVE-2021-4305
SHA-256 | 37a2bc5df5427ed04000a8d10823bd2aed8f25a960acdbe741e5cfa028d617df
Red Hat Security Advisory 2022-1975-01
Posted May 11, 2022
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2022-1975-01 - The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Issues addressed include buffer overflow, denial of service, information leakage, integer overflow, out of bounds read, out of bounds write, privilege escalation, and use-after-free vulnerabilities.

tags | advisory, denial of service, overflow, kernel, vulnerability
systems | linux, redhat
advisories | CVE-2020-0404, CVE-2020-13974, CVE-2020-27820, CVE-2021-0941, CVE-2021-20322, CVE-2021-26401, CVE-2021-29154, CVE-2021-3612, CVE-2021-3669, CVE-2021-37159, CVE-2021-3743, CVE-2021-3744, CVE-2021-3752, CVE-2021-3759, CVE-2021-3764, CVE-2021-3772, CVE-2021-3773, CVE-2021-4002, CVE-2021-4037, CVE-2021-4083, CVE-2021-4157, CVE-2021-41864, CVE-2021-4197, CVE-2021-4203, CVE-2021-42739, CVE-2021-43389, CVE-2021-43976
SHA-256 | 76e7a83f67a9594d044f0555940c9cdc95fcacfd7cb6fe3ce07a4e4115106e22
Ubuntu Security Notice USN-5210-2
Posted Jan 13, 2022
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5210-2 - USN-5210-1 fixed vulnerabilities in the Linux kernel. Unfortunately, that update introduced a regression that caused failures to boot in environments with AMD Secure Encrypted Virtualization enabled. This update fixes the problem.

tags | advisory, kernel, vulnerability
systems | linux, ubuntu
advisories | CVE-2020-26541, CVE-2021-20321, CVE-2021-3760, CVE-2021-4002, CVE-2021-41864, CVE-2021-43056, CVE-2021-43389
SHA-256 | e3346a86e14d19f527583fd7bd863d075a726e9e3b106f07da844d9e99c33e20
Ubuntu Security Notice USN-5218-1
Posted Jan 11, 2022
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5218-1 - 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. 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 or possibly execute arbitrary code.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2021-20321, CVE-2021-3760, CVE-2021-4002, CVE-2021-41864, CVE-2021-43056, CVE-2021-43267, CVE-2021-43389
SHA-256 | f90f83bbcd246c8d673aa082579a0c09cd5de90a6bc0cee2d59e2eed594b9e9a
Ubuntu Security Notice USN-5211-1
Posted Jan 6, 2022
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5211-1 - 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.

tags | advisory, kernel, local
systems | linux, ubuntu
advisories | CVE-2021-4002
SHA-256 | 282eeeb781851a7025bfcdef141027ce8a8d1d62b572b5512b58d704e9c2fec0
Ubuntu Security Notice USN-5210-1
Posted Jan 6, 2022
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5210-1 - 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. It was discovered that the Linux kernel did not properly enforce certain types of entries in the Secure Boot Forbidden Signature Database protection mechanism. An attacker could use this to bypass UEFI Secure Boot restrictions.

tags | advisory, kernel, local
systems | linux, ubuntu
advisories | CVE-2020-26541, CVE-2021-20321, CVE-2021-3760, CVE-2021-4002, CVE-2021-41864, CVE-2021-43056, CVE-2021-43389
SHA-256 | ecb4af237def80337795c4bf285352fb679661f2a5664c504d0f396c762a31ee
Kernel Live Patch Security Notice LSN-0083-1
Posted Jan 6, 2022
Authored by Benjamin M. Romer

The BPF subsystem in the Linux kernel before 4.17 mishandles situations with a long jump over an instruction sequence where inner instructions require substantial expansions into multiple BPF instructions, leading to an overflow. This affects kernel/bpf/core.c and net/core/filter.c. Maxim Levitsky discovered that the KVM hypervisor implementation for AMD processors in the Linux kernel did not properly prevent a guest VM from enabling AVIC in nested guest VMs. An attacker in a guest VM could use this to write to portions of the host’s physical memory. Other vulnerabilities have also been addressed.

tags | advisory, overflow, kernel, vulnerability
systems | linux
advisories | CVE-2018-25020, CVE-2021-22555, CVE-2021-33909, CVE-2021-3653, CVE-2021-4002
SHA-256 | ddd1e7fc677c2b02d3351058bf31466aa231865f93abfb9cdfa1d1ca55622f8d
Ubuntu Security Notice USN-5209-1
Posted Jan 6, 2022
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5209-1 - 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. It was discovered that a race condition existed in the timer implementation in the Linux kernel. A privileged attacker could use this cause a denial of service.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2021-20317, CVE-2021-20321, CVE-2021-3760, CVE-2021-4002, CVE-2021-41864, CVE-2021-43389
SHA-256 | 48064c7ea8ce65c4e3051e87cd43253fcf2b6a445eea15418d3b3f219708afba
Ubuntu Security Notice USN-5208-1
Posted Jan 6, 2022
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5208-1 - 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. 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.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2021-20321, CVE-2021-3760, CVE-2021-4002, CVE-2021-41864, CVE-2021-43056, CVE-2021-43267, CVE-2021-43389
SHA-256 | ea7e5bc5b3961bfb7b88bcc657765481b669c52e08a5c1ef062c1477afed2dba
Ubuntu Security Notice USN-5207-1
Posted Jan 6, 2022
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5207-1 - 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. It was discovered that the eBPF implementation in the Linux kernel contained a race condition around read-only maps. A privileged attacker could use this to modify read-only maps.

tags | advisory, kernel, local
systems | linux, ubuntu
advisories | CVE-2021-4001, CVE-2021-4002, CVE-2021-42739, CVE-2021-43267
SHA-256 | 63504dd3c2b3abff85b5c8960e3f39b8f7a1ce6773225176a4d31ae19837a516
Ubuntu Security Notice USN-5206-1
Posted Jan 6, 2022
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5206-1 - 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.

tags | advisory, kernel, local
systems | linux, ubuntu
advisories | CVE-2021-4002
SHA-256 | c97eba91910205966dc031db7489933170175dc1100b5a8fd362273f95d3c14e
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