Double Free in Ubuntu Linux Kernel
CVE-2021-3492
Shiftfs, an out-of-tree stacking file system included in Ubuntu Linux kernels, did not properly handle faults occurring during copy_from_user() correctly. These could lead to either a double-free situation or memory not being freed at all…
Vulnerability class: Double Free
EPSS: 0.244 (96.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
Affected products
- Ubuntu Linux Kernel — versions 5.8 kernel, 5.4 kernel
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.openwall.com/lists/oss-security/2021/04/16/2 (x_refsource_MISC)
- git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/commit/ (x_refsource_MISC)
- git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/commit/ (x_refsource_MISC)
- ubuntu.com/security/notices/USN-4917-1 (x_refsource_MISC)
- www.zerodayinitiative.com/advisories/ZDI-21-422/ (x_refsource_MISC)
- packetstormsecurity.com/files/162614/Kernel-Live-Patch-Security-Notice-LSN-0077… (x_refsource_MISC)
Frequently asked questions
- What is CVE-2021-3492?
- CVE-2021-3492 is a high-severity vulnerability in Ubuntu Linux Kernel, classified under Double Free. CVSS score: 8.8/10. Published 2021-04-17.
- How severe is CVE-2021-3492?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2021-3492 known to be exploited?
- 31 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.