Cyber Resilience

CVE-2021-3492

HighPublic PoC

Published: 17 April 2021

Published
17 April 2021
Modified
21 November 2024
KEV Added
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Patch
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CVSS Score v3.1 8.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS Score 0.2444 96.2th percentile
Risk Priority 32 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-3492 is a high-severity Missing Release of Memory after Effective Lifetime (CWE-401) vulnerability in Canonical Ubuntu Linux. Its CVSS base score is 8.8 (High).

Operationally, ranked in the top 3.8% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability details

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. An attacker could use this…

more

to cause a denial of service (kernel memory exhaustion) or gain privileges via executing arbitrary code. AKA ZDI-CAN-13562.

CWE(s)
CWE-401CWE-415

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

canonical
ubuntu linux
≤ 18.04 · 18.04.1 — 20.04 · ≤ 20.10

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References