Home/CVE/An issue was discovered in the Linux kernel 4.4 through 5.7.1. drivers/tty/vt/keyboard.c has an integer overflow if k_as
CVE

CVE-2020-13974

An issue was discovered in the Linux kernel 4.4 through 5.7.1. drivers/tty/vt/keyboard.c has an integer overflow if k_as

An issue was discovered in the Linux kernel 4.4 through 5.7.1. drivers/tty/vt/keyboard.c has an integer overflow if k_ascii is called several times in a row, aka CID-b86dab054059. NOTE: Members in the community argue that the integer overflow does not lead to a security issue in this case.

HIGH · CVSS 7.8 EPSS 0.00094
Act now
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-190Integer Overflow or Wraparound
▤

Affected Products & Versions

9
linux kernel< 4.4.227
linux kernel>= 4.5 and < 4.9.227
linux kernel>= 4.10 and < 4.14.184
linux kernel>= 4.15 and < 4.19.128
linux kernel>= 4.20 and < 5.4.46
linux kernel>= 5.5 and < 5.6.18
linux kernel>= 5.7 and < 5.7.2
debian linuxall versions
⚠

Public Exploits & PoCs

1
poclkml.org · 22/482lkml.org
▣

Scoring & Timeline

7.8
HIGH · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD09 Jun 2020 · 05:15 AM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
⚑

Vendor Advisories

25
rhsaRHSA-2022:1988Low
rhsaRHSA-2022:1975Moderate
suse-csafopenSUSE-SU-2021:0242-1
suse-csafSUSE-SU-2020:2487-1
usnUSN-4485-1
🔗

References & Sources

11
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00008.htmlMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00009.htmlMailing ListThird Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=dad0bf9ce93fa40b667eccd3306783f4db4b932bVendor Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b86dab054059b970111b5516ae548efaae5b3aaePatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2020/08/msg00019.htmlMailing ListThird Party Advisory
https://usn.ubuntu.com/4427-1/Third Party Advisory
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