CVE-2021-34693: debian debian_linux Missing Initialization of Resource
Vulnerability summary
CVE-2021-34693 is a medium (CVSS 5.5) Missing Initialization of Resource vulnerability in debian debian_linux. EPSS estimates a 0.47% chance of exploitation in the next 30 days, higher than 40.8% of scored vulnerabilities. 1 public exploit is recorded.
Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 29 · Related 24Timeline
- 14-06-2021PublishedVulnerability first disclosed.
- 08-10-2026Last modifiedVulnerability information updated.
Description
net/can/bcm.c in the Linux kernel through 5.12.10 allows local users to obtain sensitive information from kernel stack memory because parts of a data structure are uninitialized.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
EPSS trend
Probability
0.47%
Chance of exploitation in the next 30 days
Percentile
41%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.47% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
1 foundExploit Reference (openwall.com)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu59 products
- linuxAll versions (No fix recorded) | < 4.4.0-219.252 | < 4.15.0-156.163 | < 5.4.0-81.91
- linux-aws< 4.4.0-1099.104 | < 4.4.0-1135.149 | < 4.15.0-1111.118 | < 5.4.0-1055.58
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11< 5.11.0-1017.18~20.04.1
- linux-aws-5.3All versions (No fix recorded)
Debian2 products
- linux< 5.10.46-1
- debian_linuxEOL9.0 | 10.0
Linux1 product
- linux_kernel≥ 2.6.25, ≤ 5.12.10
3 vendors · 62 products
