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CVE-2021-31829

Status Candidate

Overview

kernel/bpf/verifier.c in the Linux kernel through 5.12.1 performs undesirable speculative loads, leading to disclosure of stack content via side-channel attacks, aka CID-801c6058d14a. The specific concern is not protecting the BPF stack area against speculative loads. Also, the BPF stack can contain uninitialized data that might represent sensitive information previously operated on by the kernel.

Related Files

Ubuntu Security Notice USN-5018-1
Posted Jul 21, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5018-1 - It was discovered that the virtual file system implementation in the Linux kernel contained an unsigned to signed integer conversion error. A local attacker could use this to cause a denial of service or execute arbitrary code. Piotr Krysiuk discovered that the eBPF implementation in the Linux kernel did not properly enforce limits for pointer operations. 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-2020-24586, CVE-2020-24587, CVE-2020-26139, CVE-2020-26147, CVE-2020-26558, CVE-2021-23134, CVE-2021-31829, CVE-2021-32399, CVE-2021-33034, CVE-2021-33200, CVE-2021-33909
SHA-256 | 4c1acb01997501488d94e4f295f9a8b096b13216c5f32c0bc98642127cd2ea8a
Ubuntu Security Notice USN-4997-2
Posted Jun 28, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4997-2 - USN-4997-1 fixed vulnerabilities in the Linux kernel for Ubuntu 21.04. This update provides the corresponding updates for the Linux KVM kernel for Ubuntu 21.04. Norbert Slusarek discovered a race condition in the CAN BCM networking protocol of the Linux kernel leading to multiple use-after-free vulnerabilities. A local attacker could use this issue to execute arbitrary code. Various other issues were also addressed.

tags | advisory, arbitrary, kernel, local, vulnerability, protocol
systems | linux, ubuntu
advisories | CVE-2020-24586, CVE-2020-24587, CVE-2020-24588, CVE-2020-26139, CVE-2020-26141, CVE-2020-26145, CVE-2020-26147, CVE-2021-23133, CVE-2021-23134, CVE-2021-31440, CVE-2021-31829, CVE-2021-32399, CVE-2021-33034, CVE-2021-33200, CVE-2021-3506, CVE-2021-3543, CVE-2021-3609
SHA-256 | 16f2c8cca9066cef3cbb8b6417110467cabb0932233c1b98fecf1f6a500fac6b
Ubuntu Security Notice USN-5000-2
Posted Jun 27, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5000-2 - USN-5000-1 fixed vulnerabilities in the Linux kernel for Ubuntu 20.04 LTS and the Linux HWE kernel for Ubuntu 18.04 LTS. This update provides the corresponding updates for the Linux KVM kernel for Ubuntu 20.04 LTS. Norbert Slusarek discovered a race condition in the CAN BCM networking protocol of the Linux kernel leading to multiple use-after-free vulnerabilities. A local attacker could use this issue to execute arbitrary code. Various other issues were also addressed.

tags | advisory, arbitrary, kernel, local, vulnerability, protocol
systems | linux, ubuntu
advisories | CVE-2020-24586, CVE-2020-24587, CVE-2020-24588, CVE-2020-26139, CVE-2020-26141, CVE-2020-26145, CVE-2020-26147, CVE-2021-23133, CVE-2021-23134, CVE-2021-31829, CVE-2021-32399, CVE-2021-33034, CVE-2021-33200, CVE-2021-3506, CVE-2021-3609
SHA-256 | 24cb2b08987dbf402e7352676baccf4addc89319c209a6642e849c6e40814e3f
Ubuntu Security Notice USN-5000-1
Posted Jun 23, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5000-1 - Norbert Slusarek discovered a race condition in the CAN BCM networking protocol of the Linux kernel leading to multiple use-after-free vulnerabilities. A local attacker could use this issue to execute arbitrary code. Piotr Krysiuk discovered that the eBPF implementation in the Linux kernel did not properly enforce limits for pointer operations. 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, vulnerability, protocol
systems | linux, ubuntu
advisories | CVE-2020-24586, CVE-2020-24587, CVE-2020-24588, CVE-2020-26139, CVE-2020-26141, CVE-2020-26145, CVE-2020-26147, CVE-2021-23133, CVE-2021-23134, CVE-2021-31829, CVE-2021-32399, CVE-2021-33034, CVE-2021-33200, CVE-2021-3506, CVE-2021-3609
SHA-256 | 56a1c42fded1ff1465f3df4cb8fe06844d11fa3e6008f072ab5975f0302ef3dc
Ubuntu Security Notice USN-4999-1
Posted Jun 23, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4999-1 - Norbert Slusarek discovered a race condition in the CAN BCM networking protocol of the Linux kernel leading to multiple use-after-free vulnerabilities. A local attacker could use this issue to execute arbitrary code. Piotr Krysiuk discovered that the eBPF implementation in the Linux kernel did not properly enforce limits for pointer operations. 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, vulnerability, protocol
systems | linux, ubuntu
advisories | CVE-2020-24586, CVE-2020-24587, CVE-2020-24588, CVE-2020-25670, CVE-2020-25671, CVE-2020-25673, CVE-2020-26139, CVE-2020-26141, CVE-2020-26145, CVE-2020-26147, CVE-2021-23133, CVE-2021-29155, CVE-2021-31440, CVE-2021-31829, CVE-2021-33200, CVE-2021-3609
SHA-256 | 608a8996ce80308dbc8f67bc54e75f304a5acf75c42f7825463b1e10f884ffae
Ubuntu Security Notice USN-4997-1
Posted Jun 23, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4997-1 - Norbert Slusarek discovered a race condition in the CAN BCM networking protocol of the Linux kernel leading to multiple use-after-free vulnerabilities. A local attacker could use this issue to execute arbitrary code. Piotr Krysiuk discovered that the eBPF implementation in the Linux kernel did not properly enforce limits for pointer operations. 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, vulnerability, protocol
systems | linux, ubuntu
advisories | CVE-2020-24586, CVE-2020-24587, CVE-2020-24588, CVE-2020-26139, CVE-2020-26141, CVE-2020-26145, CVE-2020-26147, CVE-2021-23133, CVE-2021-23134, CVE-2021-31440, CVE-2021-31829, CVE-2021-32399, CVE-2021-33034, CVE-2021-33200, CVE-2021-3506, CVE-2021-3543, CVE-2021-3609
SHA-256 | b752f37a5817c7e613a44c23fb3cefa0e5dee0cec9c72c2382a006d6cba9ccb6
Ubuntu Security Notice USN-4983-1
Posted Jun 4, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4983-1 - Piotr Krysiuk discovered that the eBPF implementation in the Linux kernel did not properly enforce limits for pointer operations. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Piotr Krysiuk and Benedict Schlueter discovered that the eBPF implementation in the Linux kernel performed out of bounds speculation on pointer arithmetic. A local attacker could use this to expose sensitive information. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2021-29155, CVE-2021-31829, CVE-2021-33200, CVE-2021-3501
SHA-256 | c8d6a4d1ac66d32b7a2f8aec8f4be767802cb76e03860da72e2558c5974f173a
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