Double Free in Canonical Ubuntu_linux
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…
EPSS: 0.015 (72.3th 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
- Canonical Ubuntu_linux
- Ubuntu Linux Kernel — versions 5.8 kernel, 5.4 kernel
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security@ubuntu.com (Mailing List, Third Party Advisory, x_refsource_MISC)
- security@ubuntu.com (Patch, Mailing List, x_refsource_MISC, Vendor Advisory)
- security@ubuntu.com (Patch, Mailing List, x_refsource_MISC, Vendor Advisory)
- security@ubuntu.com (x_refsource_MISC, Vendor Advisory)
- security@ubuntu.com (VDB Entry, Third Party Advisory, x_refsource_MISC)
- security@ubuntu.com (VDB Entry, Third Party Advisory, x_refsource_MISC)
Frequently asked questions
- What is CVE-2021-3492?
- CVE-2021-3492 is a high-severity vulnerability in Canonical Ubuntu_linux, classified under Missing Release of Memory after Effective Lifetime. 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.