Use After Free in Linux Kernel
CVE-2019-19767
The Linux kernel before 5.4.2 mishandles ext4_expand_extra_isize, as demonstrated by use-after-free errors in __ext4_expand_extra_isize and ext4_xattr_set_entry, related to fs/ext4/inode.c and fs/ext4/super.c, aka CID-4ea99936a163.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.021 (80.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 80.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.021 · newest: 0.021 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.2 (Release Notes, Vendor Advisory)
- bugzilla.kernel.org/show_bug.cgi (Issue Tracking, Vendor Advisory)
- bugzilla.kernel.org/show_bug.cgi (Exploit, Issue Tracking, Vendor Advisory)
- github.com/torvalds/linux/commit/4ea99936a1630f51fc3a2d61a58ec4a1c4b7d55a (Patch, Third Party Advisory)
- git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/ (Patch, Vendor Advisory)
- security.netapp.com/advisory/ntap-20200103-0001/
- lists.debian.org/debian-lts-announce/2020/01/msg00013.html (mailing-list)
- usn.ubuntu.com/4258-1/ (vendor-advisory)
- usn.ubuntu.com/4287-1/ (vendor-advisory)
- usn.ubuntu.com/4287-2/ (vendor-advisory)
Frequently asked questions
- What is CVE-2019-19767?
- CVE-2019-19767 is a medium-severity vulnerability in Linux Kernel, classified under Use After Free. CVSS score: 5.5/10. Published 2019-12-12.
- How severe is CVE-2019-19767?
- Medium severity. CVSS v3 base score is 5.5 out of 10.
- Is CVE-2019-19767 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.