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CVE-2021-4001

Status Candidate

Overview

A race condition was found in the Linux kernel's ebpf verifier between bpf_map_update_elem and bpf_map_freeze due to a missing lock in kernel/bpf/syscall.c. In this flaw, a local user with a special privilege (cap_sys_admin or cap_bpf) can modify the frozen mapped address space. This flaw affects kernel versions prior to 5.16 rc2.

Related Files

Ubuntu Security Notice USN-6417-1
Posted Oct 5, 2023
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6417-1 - It was discovered that the eBPF implementation in the Linux kernel contained a race condition around read-only maps. A privileged attacker could use this to modify read-only maps. It was discovered that the IPv6 implementation in the Linux kernel contained a high rate of hash collisions in connection lookup table. A remote attacker could use this to cause a denial of service.

tags | advisory, remote, denial of service, kernel
systems | linux, ubuntu
advisories | CVE-2021-4001, CVE-2023-1206, CVE-2023-3212, CVE-2023-3338, CVE-2023-3863, CVE-2023-4194
SHA-256 | c26238a5fdacf3ea9d3afd0da623a96b6fd205a4238fb6b5c63f66ebabb02fb1
Ubuntu Security Notice USN-5265-1
Posted Feb 3, 2022
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5265-1 - Jeremy Cline discovered a use-after-free in the nouveau graphics driver of the Linux kernel during device removal. A privileged or physically proximate attacker could use this to cause a denial of service. It was discovered that the Bluetooth subsystem in the Linux kernel contained a use-after-free vulnerability. 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-2020-27820, CVE-2021-3640, CVE-2021-3752, CVE-2021-3772, CVE-2021-4001, CVE-2021-4090, CVE-2021-4093, CVE-2021-4202, CVE-2021-42327, CVE-2021-42739
SHA-256 | 7e0f9271a061ce26f953885a06bf885e09f3bf96703739534c4177eca1b1fff1
Ubuntu Security Notice USN-5207-1
Posted Jan 6, 2022
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5207-1 - 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 contained a race condition around read-only maps. A privileged attacker could use this to modify read-only maps.

tags | advisory, kernel, local
systems | linux, ubuntu
advisories | CVE-2021-4001, CVE-2021-4002, CVE-2021-42739, CVE-2021-43267
SHA-256 | 63504dd3c2b3abff85b5c8960e3f39b8f7a1ce6773225176a4d31ae19837a516
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