Vulnerability Intelligence Report
Ubuntu linux kernel shiftfs file system double free vulnerability
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. An attacker could use this to cause a denial of service (kernel memory exhaustion) or gain privileges via executing arbitrary code. AKA ZDI-CAN-13562.
No Active Exploit Signals
CVSS Base Score
8.8
HIGH
Exploitability:2.1
Impact Score:6.1
EPSS Probability:1.55%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
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Authentication
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Weaponization
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SSVC Action
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Weaknesses (CWE)
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Ubuntu | Linux kernel | 5.8 kernel < 5.8.0-50.56 (affected), 5.4 kernel < 5.4.0-72.80 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
1.547%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Canonical Ltd. · Vendor · UK |
| Reserved | 2021-04-09T00:00:00 |
| Published | 2021-04-17T04:20:16 |
| Patch Date | 2021-04-15 |
| Last Updated | 2024-09-17T03:54:52 |
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