CVE-2019-19318: canonical ubuntu_linux Use After Free
Vulnerability summary
CVE-2019-19318 is a medium (CVSS 4.4) Use After Free vulnerability in canonical ubuntu_linux. EPSS estimates a 0.65% chance of exploitation in the next 30 days, higher than 50.9% of scored vulnerabilities. 1 public exploit is recorded.
Not severe (CVSS 4.4, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 13 · Related 12Timeline
- 27-11-2019PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
Description
In the Linux kernel 5.3.11, mounting a crafted btrfs image twice can cause an rwsem_down_write_slowpath use-after-free because (in rwsem_can_spin_on_owner in kernel/locking/rwsem.c) rwsem_owner_flags returns an already freed pointer,
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated4.4MediumCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated4.4MediumCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.65%
Chance of exploitation in the next 30 days
Percentile
51%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.65% 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 foundCve
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, administrative account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu14 products
- linux-aws-5.0All versions (No fix recorded)
- linux-azureAll versions (No fix recorded)
- linux-azure-edgeAll versions (No fix recorded)
- linux-azure-fdeAll versions (No fix recorded)
- linux-gcpAll versions (No fix recorded)
Netapp10 products
- active_iq_unified_manager≥ 9.5 (No fix recorded)
- aff_a400_firmwarena
- aff_a700s_firmwarena
- data_availability_servicesna
- fas8300_firmwarena
Debian2 products
- linux< 5.4.6-1
- debian_linuxEOL9.0
Canonical1 product
- ubuntu_linuxEOL14.04 | 16.04 | 18.04
Linux1 product
- linux_kernel5.0.21 | 5.3.11
Opensuse1 product
- leapEOL15.1
6 vendors · 29 products
References
9 links- github.com/bobfuzzer/CVE/tree/master/CVE-2019-19318X Refsource MISCREPORTExploitThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2020-03/msg00021.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory
lists.debian.org/debian-lts-announce/2021/03/msg00010.htmlMailing ListX Refsource MLISTThird Party Advisory