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CVE-2021-20321

Status Candidate

Overview

A race condition accessing file object in the Linux kernel OverlayFS subsystem was found in the way users do rename in specific way with OverlayFS. A local user could use this flaw to crash the system.

Related Files

Ubuntu Security Notice USN-6221-1
Posted Jul 13, 2023
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6221-1 - 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. It was discovered that the virtual terminal device implementation in the Linux kernel contained a race condition in its ioctl handling that led to an out-of-bounds read vulnerability. A local attacker could possibly use this to expose sensitive information.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2021-20321, CVE-2021-3753, CVE-2022-1184, CVE-2022-26373, CVE-2022-29901, CVE-2023-1990, CVE-2023-3111
SHA-256 | aad528fdb86e9bbeb6b879040fabb3eb8de4a6b4026eb87e0cb5da1c148cb4d8
Debian Security Advisory 5096-1
Posted Mar 28, 2022
Authored by Debian | Site debian.org

Debian Linux Security Advisory 5096-1 - Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leaks.

tags | advisory, denial of service, kernel, vulnerability
systems | linux, debian
advisories | CVE-2020-29374, CVE-2020-36322, CVE-2021-20317, CVE-2021-20321, CVE-2021-20322, CVE-2021-22600, CVE-2021-28711, CVE-2021-28712, CVE-2021-28713, CVE-2021-28714, CVE-2021-28715, CVE-2021-28950, CVE-2021-3640, CVE-2021-3744
SHA-256 | 75c044bf4d2e418a7cc68e74ff3d6f180013990253cbe7731409a07b3b799fa7
Red Hat Security Advisory 2022-0595-02
Posted Mar 4, 2022
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2022-0595-02 - Red Hat Advanced Cluster Management for Kubernetes 2.3.6 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. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System base score, which gives a detailed severity rating, is available for each vulnerability from the CVE links in the References section. Issues addressed include an information leakage vulnerability.

tags | advisory
systems | linux, redhat
advisories | CVE-2020-25704, CVE-2020-36322, CVE-2021-20321, CVE-2021-23566, CVE-2021-3521, CVE-2021-3712, CVE-2021-3872, CVE-2021-3918, CVE-2021-3984, CVE-2021-4019, CVE-2021-4034, CVE-2021-4122, CVE-2021-4155, CVE-2021-4192, CVE-2021-4193, CVE-2021-42574, CVE-2021-42739, CVE-2021-43565, CVE-2022-0155, CVE-2022-0185, CVE-2022-20612, CVE-2022-20617
SHA-256 | 2598df9c773007328e30775692ba0a74b35fca2f6cdbd52f2b81faf7636ae67b
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
Red Hat Security Advisory 2022-0047-03
Posted Jan 10, 2022
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2022-0047-03 - Openshift Logging Bug Fix Release. Issues addressed include a denial of service vulnerability.

tags | advisory, denial of service
systems | linux, redhat
advisories | CVE-2021-20321, CVE-2021-3712, CVE-2021-42574, CVE-2021-45105
SHA-256 | 75732aa539f8c93b32f7bd1b2b848d4871ecbdfe2368bcf7c6c0ccae796ed3ea
Red Hat Security Advisory 2022-0044-06
Posted Jan 10, 2022
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2022-0044-06 - OpenShift Logging Bug Fix Release. Issues addressed include a denial of service vulnerability.

tags | advisory, denial of service
systems | linux, redhat
advisories | CVE-2020-36327, CVE-2021-20321, CVE-2021-3712, CVE-2021-42574, CVE-2021-45105
SHA-256 | c565c4389f96bbb112673b62c18246178afcc0355fc11d803be3172c0bf9bd68
Red Hat Security Advisory 2022-0043-03
Posted Jan 10, 2022
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2022-0043-03 - Openshift Logging Bug Fix Release. Issues addressed include a denial of service vulnerability.

tags | advisory, denial of service
systems | linux, redhat
advisories | CVE-2021-20321, CVE-2021-3712, CVE-2021-42574, CVE-2021-45105
SHA-256 | d079fae8eb6ceb0252d08a240487c22383dcf81abdfd564e1d20dca27bc428a5
Red Hat Security Advisory 2022-0042-03
Posted Jan 10, 2022
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2022-0042-03 - Openshift Logging Bug Fix Release. Issues addressed include a denial of service vulnerability.

tags | advisory, denial of service
systems | linux, redhat
advisories | CVE-2021-20321, CVE-2021-3712, CVE-2021-42574, CVE-2021-45105
SHA-256 | cfa0dd01e2a218c20f34cb015fcdf1836f9175ef7da664dff678a0cd546ea25f
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
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
Red Hat Security Advisory 2021-5227-07
Posted Dec 21, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-5227-07 - The kernel packages contain the Linux kernel, the core of any Linux operating system.

tags | advisory, kernel
systems | linux, redhat
advisories | CVE-2021-20321
SHA-256 | 62ed95294c1adc3418a545a4eb61dbb60682878cf64782acbe8c51cc9cb7eec5
Red Hat Security Advisory 2021-5241-05
Posted Dec 21, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-5241-05 - The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.

tags | advisory, kernel
systems | linux, redhat
advisories | CVE-2021-20321
SHA-256 | c7234e60ddec0c3a43e15da84a23aa92fd667c24d0b4abe63f582b448cf13ddd
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