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CVE-2021-29155

Status Candidate

Overview

An issue was discovered in the Linux kernel through 5.11.x. kernel/bpf/verifier.c performs undesirable out-of-bounds speculation on pointer arithmetic, leading to side-channel attacks that defeat Spectre mitigations and obtain sensitive information from kernel memory. Specifically, for sequences of pointer arithmetic operations, the pointer modification performed by the first operation is not correctly accounted for when restricting subsequent operations.

Related Files

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
MD5 | 609de0f39f11de872db2469a1dfb7fad
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
MD5 | 18944e6d71f08e1228485e41148d89d4
Ubuntu Security Notice USN-4977-1
Posted Jun 3, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4977-1 - Kiyin discovered that the NFC LLCP protocol implementation in the Linux kernel contained a reference counting error. A local attacker could use this to cause a denial of service. Kiyin discovered that the NFC LLCP protocol implementation in the Linux kernel did not properly deallocate memory in certain error situations. A local attacker could use this to cause a denial of service. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local, protocol
systems | linux, ubuntu
advisories | CVE-2020-25670, CVE-2020-25673, CVE-2021-29155, CVE-2021-3501
MD5 | beb0471b09c906908cd367b5a8f72ecc
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