CVE-2021-4154: linux linux_kernel Use After Free

Modified

AliasesUBUNTU-CVE-2021-4154DEBIAN-CVE-2021-4154

Published 04-02-2022Last modified 03-08-2024

Vulnerability summary

CVE-2021-4154 is a high (CVSS 8.8) Use After Free vulnerability in linux linux_kernel. EPSS estimates a 1.22% chance of exploitation in the next 30 days, higher than 68.6% of scored vulnerabilities.

Priority

Routine

Not severe (CVSS 8.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?

CVSS score

8.8/10

010

High · v3.1 (NVD)

EPSS score

1.22%

0%100%

Low · 0.00 pp in 30 days

KEVNot listedNot listed by any tracked catalog.

RansomwareNot flaggedNo ransomware use recorded.

Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 17 · Related 10

RHSA-2022:0186 RHSA-2022:0187 RHSA-2022:0231 RHSA-2022:0819 RHSA-2022:0825 RHSA-2022:0841+11 more

Timeline

04-02-2022
PublishedVulnerability first disclosed.
03-08-2024
Last modifiedVulnerability information updated.

Description

A use-after-free flaw was found in cgroup1_parse_param in kernel/cgroup/cgroup-v1.c in the Linux kernel's cgroup v1 parser. A local attacker with a user privilege could cause a privilege escalation by exploiting the fsconfig syscall parameter leading to a container breakout and a denial of service on the system.

CVSS metrics

5 scores · 3 sources · 3 versions

v4.07.3v3.18.8v2.07.2

EPSS trend

Probability

1.22%

Chance of exploitation in the next 30 days

Percentile

69%

Versus all other CVEs

30-day change

No change 0.00 pp

From 1.22% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs

CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

CWE-416Use After FreeThe product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu55 products

linux< 5.4.0-88.99
linux-aws< 5.4.0-1057.60
linux-aws-5.0All versions (No fix recorded)
linux-aws-5.11< 5.11.0-1019.20~20.04.1
linux-aws-5.3All versions (No fix recorded)

linux-aws-5.4< 5.4.0-1057.60~18.04.1
linux-aws-5.8All versions (No fix recorded)
linux-aws-fips< 5.4.0-1069.73+fips2 | All versions (No fix recorded)
linux-azureAll versions (No fix recorded) | < 5.4.0-1059.62
linux-azure-5.11< 5.11.0-1017.18~20.04.1
linux-azure-5.3All versions (No fix recorded)
linux-azure-5.4< 5.4.0-1059.62~18.04.1
linux-azure-5.8All versions (No fix recorded)
linux-azure-edgeAll versions (No fix recorded)
linux-azure-fips< 5.4.0-1073.76+fips1 | All versions (No fix recorded)
linux-bluefield< 5.4.0-1019.22
linux-fips< 5.4.0-1034.40 | All versions (No fix recorded)
linux-gcpAll versions (No fix recorded) | < 5.4.0-1053.57
linux-gcp-5.11< 5.11.0-1020.22~20.04.1
linux-gcp-5.3All versions (No fix recorded)
linux-gcp-5.4< 5.4.0-1053.57~18.04.1
linux-gcp-5.8All versions (No fix recorded)
linux-gcp-fips< 5.4.0-1067.71~20.04.1 | All versions (No fix recorded)
linux-gke< 5.4.0-1053.56
linux-gke-4.15All versions (No fix recorded)
linux-gke-5.4< 5.4.0-1053.56~18.04.1
linux-gkeop< 5.4.0-1024.25
linux-gkeop-5.4< 5.4.0-1024.25~18.04.1
linux-hweAll versions (No fix recorded)
linux-hwe-5.11All versions (No fix recorded)
linux-hwe-5.4< 5.4.0-87.98~18.04.1
linux-hwe-5.8All versions (No fix recorded)
linux-hwe-edgeAll versions (No fix recorded)
linux-ibm< 5.4.0-1005.6
linux-intel-5.13All versions (No fix recorded)
linux-intel-iot-realtimeAll versions (No fix recorded)
linux-kvm< 5.4.0-1047.49
linux-oemAll versions (No fix recorded)
linux-oem-5.10< 5.10.0-1049.51
linux-oem-5.13< 5.13.0-1014.18
linux-oem-5.6All versions (No fix recorded)
linux-oracle< 5.4.0-1055.59
linux-oracle-5.0All versions (No fix recorded)
linux-oracle-5.11< 5.11.0-1019.20~20.04.1
linux-oracle-5.3All versions (No fix recorded)
linux-oracle-5.4< 5.4.0-1055.59~18.04.1
linux-oracle-5.8All versions (No fix recorded)
linux-raspi< 5.4.0-1044.48
linux-raspi-5.4< 5.4.0-1044.48~18.04.1
linux-raspi-realtimeAll versions (No fix recorded)
linux-raspi2All versions (No fix recorded)
linux-realtimeAll versions (No fix recorded)
linux-riscvAll versions (No fix recorded)
linux-riscv-5.11< 5.11.0-1020.21~20.04.1
linux-riscv-5.8All versions (No fix recorded)

Show all 55

Redhat2 products

enterprise_linux8.0
virtualization4.0

Debian1 product

linux< 5.14.6-1

Linux1 product

linux_kernel≥ 5.1, < 5.4.134 | ≥ 5.5, < 5.10.52 | ≥ 5.11, < 5.12.19 | ≥ 5.13, < 5.13.4 | 5.14:rc1

Netapp1 product

hci_baseboard_management_controllerh300e | h300s | h410s | h500e | h500s | h700e | h700s

5 vendors · 60 products

References

9 links

bugzilla.redhat.com/show_bug.cgi?id=2034514X Refsource MISCIssue TrackingPatchThird Party Advisory
git.kernel.org/pub/…X Refsource MISCMailing ListPatchVendor Advisory
cloud.google.com/anthos/clusters/docs/security-bulletinsX Refsource MISCThird Party Advisory
security.netapp.com/advisory/ntap-20220225-0004/X Refsource CONFIRMThird Party Advisory
ubuntu.com/security/CVE-2021-4154REPORT
git.kernel.org/linus/3b0462726e7ef281c35a7a4ae33e93ee2bc9975bREPORT
www.cve.org/CVERecord?id=CVE-2021-4154REPORT
security-tracker.debian.org/tracker/CVE-2021-4154Advisory
nvd.nist.gov/vuln/detail/CVE-2021-4154OvalAdvisory