4.7

CVE-2021-4001

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.
Data is provided by the National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version <= 5.15
Linux ≫ Linux Kernel Version5.16 Updaterc1
Zu dieser CVE wurde keine CISA KEV oder CERT.AT-Warnung gefunden.
EPSS Metriken
Type Source Score Percentile
EPSS FIRST.org 0.02% 0.023
CVSS Metriken
Source Base Score Exploit Score Impact Score Vector string
nvd@nist.gov 4.1 0.5 3.6
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N
nvd@nist.gov 4.7 3.4 6.9
AV:L/AC:M/Au:N/C:N/I:C/A:N
CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition

The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check. This can cause the product to perform invalid actions when the resource is in an unexpected state.

https://bugzilla.redhat.com/show_bug.cgi?id=2025645
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Third Party Advisory
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