Use After Free in Linux Kernel

CVE-2020-25220

The Linux kernel 4.9.x before 4.9.233, 4.14.x before 4.14.194, and 4.19.x before 4.19.140 has a use-after-free because skcd->no_refcnt was not considered during a backport of a CVE-2020-14356 patch. This is related to the cgroups feature.

Vulnerability class: Use-After-Free

EPSS: 0.004 (37.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

  • cve@mitre.org (Patch, Third Party Advisory, x_refsource_MISC, Issue Tracking)
  • cve@mitre.org (Patch, x_refsource_MISC, Issue Tracking, Vendor Advisory)
  • cve@mitre.org (Patch, Mailing List, Third Party Advisory, x_refsource_MISC)
  • cve@mitre.org (x_refsource_MISC, Release Notes, Vendor Advisory)
  • cve@mitre.org (x_refsource_MISC, Release Notes, Vendor Advisory)
  • cve@mitre.org (x_refsource_MISC, Release Notes, Vendor Advisory)
  • cve@mitre.org (x_refsource_CONFIRM, Third Party Advisory)
  • cve@mitre.org (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
  • cve@mitre.org (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2020-25220?
CVE-2020-25220 is a high-severity vulnerability in Linux Kernel, classified under Use After Free. CVSS score: 7.8/10. Published 2020-09-10.
How severe is CVE-2020-25220?
High severity. CVSS v3 base score is 7.8 out of 10.
Is CVE-2020-25220 known to be exploited?
17 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.