7.5

CVE-2019-11479: canonical ubuntu_linux

Modified
AliasesUBUNTU-CVE-2019-11479USN-4041-1USN-4041-2
Published 18-06-2019Last modified 16-09-2024

Vulnerability summary

CVE-2019-11479 is a high (CVSS 7.5) vulnerability in canonical ubuntu_linux. EPSS estimates a 91.66% chance of exploitation in the next 30 days, higher than 99.8% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.3, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
91.66%
0%100%
Critical · 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 38 · Related 17
DLA-1823-1DLA-1824-1DSA-4465-1MGASA-2019-0195MGASA-2019-0196MGASA-2019-0197

Timeline

  1. 18-06-2019
    PublishedVulnerability first disclosed.
  2. 16-09-2024
    Last modifiedVulnerability information updated.

Description

Jonathan Looney discovered that the Linux kernel default MSS is hard-coded to 48 bytes. This allows a remote peer to fragment TCP resend queues significantly more than if a larger MSS were enforced. A remote attacker could use this to cause a denial of service. This has been fixed in stable kernel releases 4.4.182, 4.9.182, 4.14.127, 4.19.52, 5.1.11, and is fixed in commits 967c05aee439e6e5d7d805e195b3a20ef5c433d6 and 5f3e2bf008c2221478101ee72f5cb4654b9fc363.

CVSS metrics

7 scores · 4 sources · 3 versions

EPSS trend

Probability

91.66%

Chance of exploitation in the next 30 days

Percentile

100%

Versus all other CVEs

30-day change

No change 0.00 pp

From 91.66% 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, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu23 products
  • linuxAll versions (No fix recorded) | < 4.4.0-154.181 | < 4.15.0-54.58
  • linux-aws< 4.4.0-1048.52 | < 4.4.0-1054.58 | < 4.4.0-1087.98 | < 4.15.0-1043.45
  • linux-aws-hwe< 4.15.0-1043.45~16.04.1
  • linux-azure< 4.15.0-1049.54~14.04.1 | < 4.15.0-1059.64~14.04.1 | < 4.15.0-1049.54 | < 4.18.0-1023.24~18.04.1
  • linux-azure-fdeAll versions (No fix recorded)
F517 products
  • big-ip_access_policy_manager≥ 11.5.2, < 11.6.5.1 | ≥ 12.1.0, < 12.1.5.1 | ≥ 13.1.0, < 13.1.3.2 | ≥ 14.0.0, < 14.0.1.1 | ≥ 14.1.2, < 14.1.2.1 | ≥ 15.0.0, < 15.0.1.1
  • big-ip_advanced_firewall_manager≥ 11.5.2, < 11.6.5.1 | ≥ 12.1.0, < 12.1.5.1 | ≥ 13.1.0, < 13.1.3.2 | ≥ 14.0.0, < 14.0.1.1 | ≥ 14.1.2, < 14.1.2.1 | ≥ 15.0.0, < 15.0.1.1
  • big-ip_analytics≥ 11.5.2, < 11.6.5.1 | ≥ 12.1.0, < 12.1.5.1 | ≥ 13.1.0, < 13.1.3.2 | ≥ 14.0.0, < 14.0.1.1 | ≥ 14.1.2, < 14.1.2.1 | ≥ 15.0.0, < 15.0.1.1
  • big-ip_application_acceleration_manager≥ 11.5.2, < 11.6.5.1 | ≥ 12.1.0, < 12.1.5.1 | ≥ 13.1.0, < 13.1.3.2 | ≥ 14.0.0, < 14.0.1.1 | ≥ 14.1.2, < 14.1.2.1 | ≥ 15.0.0, < 15.0.1.1
  • big-ip_application_security_manager≥ 11.5.2, < 11.6.5.1 | ≥ 12.1.0, < 12.1.5.1 | ≥ 13.1.0, < 13.1.3.2 | ≥ 14.0.0, < 14.0.1.1 | ≥ 14.1.2, < 14.1.2.1 | ≥ 15.0.0, < 15.0.1.1
Redhat2 products
Canonical1 product
Debian1 product
  • linux< 4.19.37-4
Linux1 product
  • linux_kernel≥ 4.4, < 4.4.182 | ≥ 4.9, < 4.9.182 | ≥ 4.14, < 4.14.127 | ≥ 4.19, < 4.19.52 | ≥ 5.1, < 5.1.11

6 vendors · 45 products

References

33 links
Show all 33 references