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CVE-2021-20194

Status Candidate

Overview

There is a vulnerability in the linux kernel versions higher than 5.2 (if kernel compiled with config params CONFIG_BPF_SYSCALL=y , CONFIG_BPF=y , CONFIG_CGROUPS=y , CONFIG_CGROUP_BPF=y , CONFIG_HARDENED_USERCOPY not set, and BPF hook to getsockopt is registered). As result of BPF execution, the local user can trigger bug in __cgroup_bpf_run_filter_getsockopt() function that can lead to heap overflow (because of non-hardened usercopy). The impact of attack could be deny of service or possibly privileges escalation.

Related Files

Red Hat Security Advisory 2021-4140-02
Posted Nov 10, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-4140-02 - 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, bypass, denial of service, double free, heap overflow, information leakage, null pointer, out of bounds read, and use-after-free vulnerabilities.

tags | advisory, denial of service, overflow, kernel, vulnerability
systems | linux, redhat
advisories | CVE-2020-0427, CVE-2020-24502, CVE-2020-24503, CVE-2020-24504, CVE-2020-24586, CVE-2020-24587, CVE-2020-24588, CVE-2020-26139, CVE-2020-26140, CVE-2020-26141, CVE-2020-26143, CVE-2020-26144, CVE-2020-26145, CVE-2020-26146, CVE-2020-26147, CVE-2020-29368, CVE-2020-29660, CVE-2020-36158, CVE-2020-36386, CVE-2021-0129, CVE-2021-20194, CVE-2021-20239, CVE-2021-23133, CVE-2021-28950, CVE-2021-28971, CVE-2021-29155
SHA-256 | 06051ab16cb42d450d376dba8b9418f4b1e3e84d93535dfa51d4c79b9b2affd5
Red Hat Security Advisory 2021-4356-28
Posted Nov 10, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-4356-28 - The kernel packages contain the Linux kernel, the core of any Linux operating system. Issues addressed include buffer overflow, bypass, denial of service, double free, heap overflow, information leakage, null pointer, out of bounds read, and use-after-free vulnerabilities.

tags | advisory, denial of service, overflow, kernel, vulnerability
systems | linux, redhat
advisories | CVE-2020-0427, CVE-2020-24502, CVE-2020-24503, CVE-2020-24504, CVE-2020-24586, CVE-2020-24587, CVE-2020-24588, CVE-2020-26139, CVE-2020-26140, CVE-2020-26141, CVE-2020-26143, CVE-2020-26144, CVE-2020-26145, CVE-2020-26146, CVE-2020-26147, CVE-2020-27777, CVE-2020-29368, CVE-2020-29660, CVE-2020-36158, CVE-2020-36386, CVE-2021-0129, CVE-2021-20194, CVE-2021-20239, CVE-2021-23133, CVE-2021-28950, CVE-2021-28971
SHA-256 | 4dfc7aebdc7ac022001a4c7d69c2bd52229c03ec9dfec7f38b9b87cefa159f78
Ubuntu Security Notice USN-4912-1
Posted Apr 13, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4912-1 - Piotr Krysiuk discovered that the BPF JIT compiler for x86 in the Linux kernel did not properly validate computation of branch displacements in some situations. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. It was discovered that a race condition existed in the binder IPC implementation in the Linux kernel, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, x86, kernel, local
systems | linux, ubuntu
advisories | CVE-2020-0423, CVE-2020-0465, CVE-2020-0466, CVE-2020-14351, CVE-2020-14390, CVE-2020-25285, CVE-2020-25645, CVE-2020-25669, CVE-2020-27830, CVE-2020-36158, CVE-2021-20194, CVE-2021-29154, CVE-2021-3178, CVE-2021-3411
SHA-256 | 590166453ec29f1473b4cb64bcf7651991eb909ac482b366e52b4648a1f60409
Ubuntu Security Notice USN-4909-1
Posted Apr 13, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4909-1 - Loris Reiff discovered that the BPF implementation in the Linux kernel did not properly validate attributes in the getsockopt BPF hook. A local attacker could possibly use this to cause a denial of service. Olivier Benjamin, Norbert Manthey, Martin Mazein, and Jan H. Schoenherr discovered that the Xen paravirtualization backend in the Linux kernel did not properly propagate errors to frontend drivers in some situations. An attacker in a guest VM could possibly use this to cause a denial of service. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2021-20194, CVE-2021-26930, CVE-2021-26931, CVE-2021-3348
SHA-256 | 30e20c1b500ac0d72714420edfc6e37a2004db1fe98dcc4cd43e0d45b976cd86
Ubuntu Security Notice USN-4884-1
Posted Mar 22, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4884-1 - Loris Reiff discovered that the BPF implementation in the Linux kernel did not properly validate attributes in the getsockopt BPF hook. A local attacker could possibly use this to cause a denial of service. It was discovered that the priority inheritance futex implementation in the Linux kernel contained a race condition, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2021-20194, CVE-2021-3347, CVE-2021-3348
SHA-256 | 6489a0321e388e395c9abf2af0d1e25ed8126a432c304b1773a5b533cb22c005
Ubuntu Security Notice USN-4879-1
Posted Mar 16, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4879-1 - It was discovered that the Marvell WiFi-Ex device driver in the Linux kernel did not properly validate ad-hoc SSIDs. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Loris Reiff discovered that the BPF implementation in the Linux kernel did not properly validate attributes in the getsockopt BPF hook. A local attacker could possibly use this to cause a denial of service. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2020-36158, CVE-2021-20194
SHA-256 | 11133301a24779f9f00fc76f4d8a427a2f942a2664c2099bd2170fa27ce298d7
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