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CVE-2021-33624

Status Candidate

Overview

In kernel/bpf/verifier.c in the Linux kernel before 5.12.13, a branch can be mispredicted (e.g., because of type confusion) and consequently an unprivileged BPF program can read arbitrary memory locations via a side-channel attack, aka CID-9183671af6db.

Related Files

Ubuntu Security Notice USN-5115-1
Posted Oct 21, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5115-1 - It was discovered that a race condition existed in the Atheros Ath9k WiFi driver in the Linux kernel. An attacker could possibly use this to expose sensitive information. Ofek Kirzner, Adam Morrison, Benedict Schlueter, and Piotr Krysiuk discovered that the BPF verifier in the Linux kernel missed possible mispredicted branches due to type confusion, allowing a side-channel attack. An attacker could use this to expose sensitive information. Various other issues were also addressed.

tags | advisory, kernel
systems | linux, ubuntu
advisories | CVE-2020-3702, CVE-2021-33624, CVE-2021-34556, CVE-2021-35477, CVE-2021-3679, CVE-2021-37159, CVE-2021-3732, CVE-2021-3739, CVE-2021-3743, CVE-2021-3753, CVE-2021-3759, CVE-2021-38166, CVE-2021-38204, CVE-2021-38205, CVE-2021-40490, CVE-2021-42008
SHA-256 | 123e5f4aa3de879d935abfb080a9134445af106fa262a01d71265623b346525a
Ubuntu Security Notice USN-5092-3
Posted Oct 19, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5092-3 - USN-5092-2 fixed vulnerabilities in Linux 5.11-based kernels. Unfortunately, for Linux kernels intended for use within Microsoft Azure environments, that update introduced a regression that could cause the kernel to fail to boot in large Azure instance types. This update fixes the problem. Various other issues were also addressed.

tags | advisory, kernel, vulnerability
systems | linux, ubuntu
advisories | CVE-2021-33624, CVE-2021-34556, CVE-2021-35477, CVE-2021-3679, CVE-2021-37159, CVE-2021-37576, CVE-2021-38160, CVE-2021-38199, CVE-2021-38201, CVE-2021-38204, CVE-2021-38205, CVE-2021-41073
SHA-256 | 2f8462834b9c412b2c94caea0415569d6a8d0a25ce4c553b1643bb9766389a30
Ubuntu Security Notice USN-5091-3
Posted Oct 15, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5091-3 - USN-5091-1 fixed vulnerabilities in Linux 5.4-based kernels. Unfortunately, for Linux kernels intended for use within Microsoft Azure environments, that update introduced a regression that could cause the kernel to fail to boot in large Azure instance types. This update fixes the problem. Various other issues were also addressed.

tags | advisory, kernel, vulnerability
systems | linux, ubuntu
advisories | CVE-2021-33624, CVE-2021-3679, CVE-2021-37576, CVE-2021-38160, CVE-2021-38199, CVE-2021-38204
SHA-256 | 24c408984ea4c4c10e651302744cddabd5b13c5cce9576cf919599003f060a83
Ubuntu Security Notice USN-5091-2
Posted Oct 1, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5091-2 - Ofek Kirzner, Adam Morrison, Benedict Schlueter, and Piotr Krysiuk discovered that the BPF verifier in the Linux kernel missed possible mispredicted branches due to type confusion, allowing a side-channel attack. An attacker could use this to expose sensitive information. It was discovered that the tracing subsystem in the Linux kernel did not properly keep track of per-cpu ring buffer state. A privileged attacker could use this to cause a denial of service. Various other issues were also addressed.

tags | advisory, denial of service, kernel
systems | linux, ubuntu
advisories | CVE-2021-33624, CVE-2021-3679, CVE-2021-38160, CVE-2021-38199, CVE-2021-38204
SHA-256 | 8a8a2e75ddbcda95809cae2b0daa43ffa458f1fb2f6eba2572ac767c9100c9b1
Ubuntu Security Notice USN-5092-2
Posted Sep 29, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5092-2 - Valentina Palmiotti discovered that the io_uring subsystem in the Linux kernel could be coerced to free adjacent memory. A local attacker could use this to execute arbitrary code. Ofek Kirzner, Adam Morrison, Benedict Schlueter, and Piotr Krysiuk discovered that the BPF verifier in the Linux kernel missed possible mispredicted branches due to type confusion, allowing a side-channel attack. An attacker could use this to expose sensitive information. Various other issues were also addressed.

tags | advisory, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2021-33624, CVE-2021-34556, CVE-2021-35477, CVE-2021-3679, CVE-2021-37159, CVE-2021-37576, CVE-2021-38160, CVE-2021-38199, CVE-2021-38201, CVE-2021-38204, CVE-2021-38205, CVE-2021-41073
SHA-256 | fe6e6f7b890fe9c454e6d8b6981a93e9900e3e12cc8de38080233a23b6f9f395
Ubuntu Security Notice USN-5092-1
Posted Sep 28, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5092-1 - Valentina Palmiotti discovered that the io_uring subsystem in the Linux kernel could be coerced to free adjacent memory. A local attacker could use this to execute arbitrary code. Ofek Kirzner, Adam Morrison, Benedict Schlueter, and Piotr Krysiuk discovered that the BPF verifier in the Linux kernel missed possible mispredicted branches due to type confusion, allowing a side-channel attack. An attacker could use this to expose sensitive information. Various other issues were also addressed.

tags | advisory, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2021-33624, CVE-2021-34556, CVE-2021-35477, CVE-2021-3679, CVE-2021-37159, CVE-2021-37576, CVE-2021-38160, CVE-2021-38199, CVE-2021-38201, CVE-2021-38204, CVE-2021-38205, CVE-2021-41073
SHA-256 | ebcf129926760acf6a8d3e98fe23c9b1ac0c8a4d82db537ed58774cee102bccf
Ubuntu Security Notice USN-5091-1
Posted Sep 28, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5091-1 - Ofek Kirzner, Adam Morrison, Benedict Schlueter, and Piotr Krysiuk discovered that the BPF verifier in the Linux kernel missed possible mispredicted branches due to type confusion, allowing a side-channel attack. An attacker could use this to expose sensitive information. It was discovered that the tracing subsystem in the Linux kernel did not properly keep track of per-cpu ring buffer state. A privileged attacker could use this to cause a denial of service. Various other issues were also addressed.

tags | advisory, denial of service, kernel
systems | linux, ubuntu
advisories | CVE-2021-33624, CVE-2021-3679, CVE-2021-37576, CVE-2021-38160, CVE-2021-38199, CVE-2021-38204
SHA-256 | e091ef36b1fd7e00cec219aaafc4dbf41a9c32a20d118dea6371229fe281294a
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