7.2

CVE-2021-22600: Linux Kernel Privilege Escalation Vulnerability

KEV
Analyzed
AliasesUBUNTU-CVE-2021-22600DEBIAN-CVE-2021-22600
Published 26-01-2022Last modified 21-10-2025

Vulnerability summary

CVE-2021-22600 is a high (CVSS 7.2) Double Free vulnerability in Linux Kernel. It is known to be exploited: CISA lists it, first on 11-04-2022. EPSS estimates a 6.59% chance of exploitation in the next 30 days, higher than 93.8% of scored vulnerabilities.

Priority
Act nowlisted as exploited

Listed as exploited by CISA (11-04-2022)

Source freshness unavailable

How is this decided?
CVSS score
7.2/10
010
High · v2.0 (NVD)
EPSS score
6.59%
0%100%
Low · 0.00 pp in 30 days
KEVExploited in the wildCritical · listed in 1 catalog
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 18 · Related 16
DLA-2941-1DSA-5096-1OPENSUSE-SU-2022:0363-1OPENSUSE-SU-2022:0370-1SUSE-SU-2022:0363-1SUSE-SU-2022:0365-1

Timeline

  1. 26-01-2022
    PublishedVulnerability first disclosed.
  2. 11-04-2022
    Added to CISA KEVExploitedLinux Kernel Privilege Escalation Vulnerability
  3. 02-05-2022
    CISA remediation dueDeadline passedApply updates per vendor instructions.
  4. 21-10-2025
    Last modifiedVulnerability information updated.

Description

A double free bug in packet_set_ring() in net/packet/af_packet.c can be exploited by a local user through crafted syscalls to escalate privileges or deny service. We recommend upgrading kernel past the effected versions or rebuilding past ec6af094ea28f0f2dda1a6a33b14cd57e36a9755

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

6.59%

Chance of exploitation in the next 30 days

Percentile

94%

Versus all other CVEs

30-day change

No change 0.00 pp

From 6.59% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEVListed
Added
11-04-2022
Federal due date
02-05-2022
ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

CISA required action

Apply updates per vendor instructions. nvd.nist.gov/vuln/detail/CVE-2021-22600

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu67 products
  • linux< 4.15.0-169.177 | < 5.4.0-100.113
  • linux-aws< 4.15.0-1121.129 | < 5.4.0-1066.69
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
  • linux-aws-5.13< 5.13.0-1014.15~20.04.1
Netapp9 products
Debian2 products
Linux1 product
  • linux_kernel≥ 4.14.175, < 4.14.259 | ≥ 4.19.114, < 4.19.222 | ≥ 5.4.29, < 5.4.168 | ≥ 5.5.14, < 5.10.88 | ≥ 5.11, < 5.15.11
Linux kernel1 product
  • kernel≥ unspecified, < 5.4.168 | ≥ unspecified, < 5.10.88 | ≥ unspecified, < 5.15.11 | ≥ unspecified, < 5.16-rc6

5 vendors · 80 products

References

17 links
Show all 17 references