7.8

CVE-2019-19448: canonical ubuntu_linux Use After Free

Modified
AliasesUBUNTU-CVE-2019-19448DEBIAN-CVE-2019-19448
Published 08-12-2019Last modified 05-08-2024

Vulnerability summary

CVE-2019-19448 is a high (CVSS 7.8) Use After Free vulnerability in canonical ubuntu_linux. EPSS estimates a 2.14% chance of exploitation in the next 30 days, higher than 82% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Prioritisepublic exploit

Public exploit (GitHub, Date unknown)

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (NVD)
EPSS score
2.14%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1github

Advisory lineage

Upstream 0 · Downstream 4 · Related 1
DLA-2385-1DLA-2420-1MGASA-2020-0355USN-4578-1

Timeline

  1. 08-12-2019
    PublishedVulnerability first disclosed.
  2. 05-08-2024
    Last modifiedVulnerability information updated.

Description

In the Linux kernel 5.0.21 and 5.3.11, mounting a crafted btrfs filesystem image, performing some operations, and then making a syncfs system call can lead to a use-after-free in try_merge_free_space in fs/btrfs/free-space-cache.c because the pointer to a left data structure can be the same as the pointer to a right data structure.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

2.14%

Chance of exploitation in the next 30 days

Percentile

82%

Versus all other CVEs

30-day change

No change 0.00 pp

From 2.14% 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

1 found
  • githubUnverified

    Cve

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Version check

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

Ubuntu40 products
  • linuxAll versions (No fix recorded) | < 4.4.0-190.220 | < 4.15.0-121.123 | < 5.4.0-48.52
  • linux-aws< 4.4.0-1078.82 | < 4.4.0-1114.127 | < 4.15.0-1086.91 | < 5.4.0-1025.25
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.3All versions (No fix recorded)
  • linux-aws-5.4< 5.4.0-1025.25~18.04.1
Netapp15 products
Debian2 products
Canonical1 product
Linux1 product
  • linux_kernel≥ 2.6.31, < 4.4.233 | ≥ 4.5.0, < 4.9.233 | ≥ 4.10, < 4.14.194 | ≥ 4.15, < 4.19.141 | ≥ 4.20, < 5.4.60 | ≥ 5.5.0, < 5.7.17 | ≥ 5.8, < 5.8.3

5 vendors · 59 products

References

10 links