Resource exhaustion in Linux Kernel
CVE-2021-20265
A flaw was found in the way memory resources were freed in the unix_stream_recvmsg function in the Linux kernel when a signal was pending. This flaw allows an unprivileged local user to crash the system by exhausting available memory. The highest threat from this vulnerability is to system availability.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.003 (24.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 24.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Linux Kernel
- Oracle Tekelec Platform Distribution
- Kernel — versions Linux kernel 4.5-rc3
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)
- git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/ (Patch, Vendor Advisory)
- www.oracle.com/security-alerts/cpuoct2021.html (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-20265?
- CVE-2021-20265 is a medium-severity vulnerability in Linux Kernel, classified under Uncontrolled Resource Consumption. CVSS score: 5.5/10. Published 2021-03-10.
- How severe is CVE-2021-20265?
- Medium severity. CVSS v3 base score is 5.5 out of 10.
- Is CVE-2021-20265 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.