Buffer overflow in Linux Kernel
CVE-2021-33656
When setting font with malicous data by ioctl cmd PIO_FONT,kernel will write memory out of bounds.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (47.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 47.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: +0.000
Affected products
- Linux Kernel
- Openatom Openeuler — versions 20.03
- Debian Linux — versions 10.0
- Openeuler:kernel — versions <5.10.127
Weakness classification (CWE)
Public proof-of-concept exploits
References
- git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/releases/5… (Patch, Third Party Advisory)
- www.openeuler.org/en/security/cve/detail.html (Third Party Advisory)
- www.openwall.com/lists/oss-security/2022/07/19/3 (mailing-list, Patch, Mailing List, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2022/10/msg00000.html (mailing-list, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-33656?
- CVE-2021-33656 is a medium-severity vulnerability in Linux Kernel, classified under Out-of-bounds Write. CVSS score: 6.8/10. Published 2022-07-18.
- How severe is CVE-2021-33656?
- Medium severity. CVSS v3 base score is 6.8 out of 10.
- Is CVE-2021-33656 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.