Medium severity · published Jul 18, 2022
CVE-2021-33655
When sending malicous data to kernel by ioctl cmd FBIOPUT_VSCREENINFO,kernel will write memory out of bounds
6.7
CVSS
0.3%
EPSS
No
On KEV
Description
When sending malicous data to kernel by ioctl cmd FBIOPUT_VSCREENINFO,kernel will write memory out of bounds.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 24% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
Kernel · Linux
5.18 5.19.0-rc1 · source: vendor, NVD
DL
Debian Linux · Debian
10.0; 11.0 · source: NVD
SS
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem · Siemens
before V1.1 · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-33655
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-33655
Mailing List
http://www.openwall.com/lists/oss-security/2022/07/19/2
Mailing List
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=086ff84617185393a0bbf25830c4f36412a7d3f4
Mailing List
https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html
Third Party Advisory
https://www.debian.org/security/2022/dsa-5191
cert-portal.siemens.com
https://cert-portal.siemens.com/productcert/html/ssa-794697.html
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