8.8

CVE-2019-14821: canonical ubuntu_linux Out-of-bounds Write

Modified
AliasesRHSA-2019:4256UBUNTU-CVE-2019-14821DEBIAN-CVE-2019-14821
Published 19-09-2019Last modified 05-08-2024

Vulnerability summary

CVE-2019-14821 is a high (CVSS 8.8) Out-of-bounds Write vulnerability in canonical ubuntu_linux. EPSS estimates a 0.76% chance of exploitation in the next 30 days, higher than 55.4% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
8.8/10
010
High · v3.1 (NVD)
EPSS score
0.76%
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 35 · Related 21
DLA-1930-1DLA-1940-1DSA-4531-1MGASA-2019-0287MGASA-2019-0288MGASA-2019-0333

Timeline

  1. 19-09-2019
    PublishedVulnerability first disclosed.
  2. 05-08-2024
    Last modifiedVulnerability information updated.

Description

An out-of-bounds access issue was found in the Linux kernel, all versions through 5.3, in the way Linux kernel's KVM hypervisor implements the Coalesced MMIO write operation. It operates on an MMIO ring buffer 'struct kvm_coalesced_mmio' object, wherein write indices 'ring->first' and 'ring->last' value could be supplied by a host user-space process. An unprivileged host user or process with access to '/dev/kvm' device could use this flaw to crash the host kernel, resulting in a denial of service or potentially escalating privileges on the system.

CVSS metrics

9 scores · 5 sources · 4 versions

EPSS trend

Probability

0.76%

Chance of exploitation in the next 30 days

Percentile

55%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.76% 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.

Redhat31 products
Ubuntu26 products
  • linuxAll versions (No fix recorded) | < 4.4.0-166.195 | < 4.15.0-66.75
  • linux-aws< 4.4.0-1056.60 | < 4.4.0-1096.107 | < 4.15.0-1052.54
  • linux-aws-fips< 4.15.0-2018.18 | All versions (No fix recorded)
  • linux-aws-hwe< 4.15.0-1052.54~16.04.1
  • linux-azure< 4.15.0-1061.66~14.04.1 | < 4.15.0-1061.66 | < 5.0.0-1023.24~18.04.1
Netapp13 products
Debian2 products
Linux2 products
  • kernelall through 5.3
  • linux_kernel≥ 2.6.27, ≤ 3.15.10 | ≥ 3.16, < 3.16.74 | ≥ 4.4, < 4.4.194 | ≥ 4.9, < 4.9.194 | ≥ 4.14, < 4.14.146 | ≥ 4.19, < 4.19.75 | ≥ 5.2, < 5.2.17 | ≥ 5.3, < 5.3.1 | 5.4:rc1
Canonical1 product
Fedoraproject1 product
Opensuse1 product
Oracle1 product

9 vendors · 78 products

References

44 links
Show all 44 references