Time-of-check Time-of-use (TOCTOU) Affecting kernel-tools package, versions *
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Test your applications- Snyk ID SNYK-RHEL8-KERNELTOOLS-1924989
- published 23 Nov 2021
- disclosed 15 Nov 2021
Introduced: 15 Nov 2021
CVE-2021-4001 Open this link in a new tabHow to fix?
There is no fixed version for RHEL:8 kernel-tools.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-tools package and not the kernel-tools package as distributed by RHEL.
See How to fix? for RHEL:8 relevant fixed versions and status.
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.