5.5

CVE-2023-31085: linux linux_kernel Divide By Zero

Modified
AliasesUBUNTU-CVE-2023-31085DEBIAN-CVE-2023-31085
Published 24-04-2023Last modified 14-10-2026

Vulnerability summary

CVE-2023-31085 is a medium (CVSS 5.5) Divide By Zero vulnerability in linux linux_kernel. EPSS estimates a 0.38% chance of exploitation in the next 30 days, higher than 32.1% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.38%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 27 · Related 29
SUSE-SU-2023:4343-1SUSE-SU-2023:4345-1SUSE-SU-2023:4346-1SUSE-SU-2023:4347-1SUSE-SU-2023:4348-1SUSE-SU-2023:4349-1

Timeline

  1. 24-04-2023
    PublishedVulnerability first disclosed.
  2. 14-10-2026
    Last modifiedVulnerability information updated.

Description

An issue was discovered in drivers/mtd/ubi/cdev.c in the Linux kernel 6.2. There is a divide-by-zero error in do_div(sz,mtd->erasesize), used indirectly by ctrl_cdev_ioctl, when mtd->erasesize is 0.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.38%

Chance of exploitation in the next 30 days

Percentile

32%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.38% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu110 products
  • linuxAll versions (No fix recorded) | < 4.4.0-248.282 | < 4.15.0-220.231 | < 5.4.0-167.184 | < 5.15.0-89.99
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 4.4.0-1125.131 | < 4.4.0-1163.178 | < 4.15.0-1163.176 | < 5.4.0-1114.124 | < 5.15.0-1050.55
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linuxAll versions (No fix recorded)
Linux1 product

3 vendors · 112 products

References

29 links
Show all 29 references