Vulnerability in Linux Kernel
CVE-2021-20317
A flaw was found in the Linux kernel. A corrupted timer tree caused the task wakeup to be missing in the timerqueue_add function in lib/timerqueue.c. This flaw allows a local attacker with special user privileges to cause a denial of service, slowing and eventually stopping the system while running OSP.
Vulnerability class: Dirty Pipe (CVE-2022-0847)
EPSS: 0.004 (32.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Linux Linux_kernel — versions 5.4
- Debian Debian_linux — versions 9.0, 10.0
- N/a Kernel — versions Kernel 5.3 rc1
Weakness classification (CWE)
Public proof-of-concept exploits
References
- secalert@redhat.com (Patch, x_refsource_MISC, Vendor Advisory)
- secalert@redhat.com (Third Party Advisory, x_refsource_MISC, Issue Tracking)
- secalert@redhat.com (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
- secalert@redhat.com (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
- secalert@redhat.com (vendor-advisory, Third Party Advisory, x_refsource_DEBIAN)
- secalert@redhat.com (x_refsource_CONFIRM)
Frequently asked questions
- What is CVE-2021-20317?
- CVE-2021-20317 is a medium-severity vulnerability in Linux Kernel, classified under Improper Initialization. CVSS score: 4.4/10. Published 2021-09-27.
- How severe is CVE-2021-20317?
- Medium severity. CVSS v3 base score is 4.4 out of 10.
- Is CVE-2021-20317 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.