6.5

CVE-2019-10638: linux linux_kernel Inadequate Encryption Strength

Modified
AliasesUBUNTU-CVE-2019-10638DEBIAN-CVE-2019-10638
Published 05-07-2019Last modified 04-08-2024

Vulnerability summary

CVE-2019-10638 is a medium (CVSS 6.5) Inadequate Encryption Strength vulnerability in linux linux_kernel. EPSS estimates a 2.57% chance of exploitation in the next 30 days, higher than 85.1% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 6.5, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
6.5/10
010
Medium · v3.0 (NVD)
EPSS score
2.57%
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 24 · Related 16
DLA-1884-1DLA-1885-1DSA-4495-1DSA-4497-1OPENSUSE-SU-2019:1716-1OPENSUSE-SU-2019:1757-1

Timeline

  1. 05-07-2019
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

In the Linux kernel before 5.1.7, a device can be tracked by an attacker using the IP ID values the kernel produces for connection-less protocols (e.g., UDP and ICMP). When such traffic is sent to multiple destination IP addresses, it is possible to obtain hash collisions (of indices to the counter array) and thereby obtain the hashing key (via enumeration). An attack may be conducted by hosting a crafted web page that uses WebRTC or gQUIC to force UDP traffic to attacker-controlled IP addresses.

CVSS metrics

5 scores · 3 sources · 3 versions

EPSS trend

Probability

2.57%

Chance of exploitation in the next 30 days

Percentile

85%

Versus all other CVEs

30-day change

No change 0.00 pp

From 2.57% 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: network-reachable, no authentication, user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu27 products
  • linuxAll versions (No fix recorded) | < 4.4.0-161.189 | < 4.15.0-60.67
  • linux-aws< 4.4.0-1054.58 | < 4.4.0-1092.103 | < 4.15.0-1047.49
  • linux-aws-fips< 4.15.0-2018.18 | All versions (No fix recorded)
  • linux-aws-hwe< 4.15.0-1047.49~16.04.1
  • linux-azure< 4.15.0-1059.64~14.04.1 | < 4.15.0-1056.61 | < 5.0.0-1018.19~18.04.1
Debian1 product
  • linux< 5.2.6-1
Linux1 product

3 vendors · 29 products

References

37 links
Show all 37 references