Vulnerability · Published Aug 24, 2022 · Assigned by redhat
CVE-2021-4028
High 7.8
In plain English
A high-severity use-after-free in kernel. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)7.8High
Exploit odds (30 days)0.3%top 75.2% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
A flaw in the Linux kernel's implementation of RDMA communications manager listener code allowed an attacker with local access to setup a socket to listen on a high port allowing for a list element to be used after free. Given the ability to execute code, a local attacker could leverage this use-after-free to crash the system or possibly escalate privileges on the system.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | kernel-tools-libs-devel | 4.18.0-348.23.1.el8_5 | ALSA-2022:1550 |
| Debian:12 | linux | 5.14.12-1 | DEBIAN-CVE-2021-4028 |
| Debian:13 | linux | 5.14.12-1 | DEBIAN-CVE-2021-4028 |
| Debian:14 | linux | 5.14.12-1 | DEBIAN-CVE-2021-4028 |
| Rocky Linux:8 | kernel | 0:4.18.0-348.23.1.el8_5 | RLSA-2022:1550 |
| Rocky Linux:8 | kernel-rt | 0:4.18.0-348.23.1.rt7.153.el8_5 | RLSA-2022:1555 |
Affected products (as reported)
Weakness: CWE-416
References
- https://lkml.org/lkml/2021/10/4/697
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=bc0bdc5afaa74
- https://bugzilla.redhat.com/show_bug.cgi?id=2027201
- https://access.redhat.com/security/cve/CVE-2021-4028
- https://bugzilla.suse.com/show_bug.cgi?id=1193167#c0
- https://security.netapp.com/advisory/ntap-20221228-0002/