CVE-2021-3492
moderate-risk
Published 2021-04-17
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.
Do I need to act?
!
24.4% chance of exploitation in next 30 days
EPSS score — higher than 76% of all CVEs
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
8
CVSS 8.8/10
High
LOCAL
/ LOW complexity
Affected Products (2)
Affected Vendors
References (12)
Third Party Advisory
http://packetstormsecurity.com/files/162614/Kernel-Live-Patch-Security-Notice-LS...
Vendor Advisory
https://ubuntu.com/security/notices/USN-4917-1
Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-422/
Third Party Advisory
http://packetstormsecurity.com/files/162614/Kernel-Live-Patch-Security-Notice-LS...
Vendor Advisory
https://ubuntu.com/security/notices/USN-4917-1
Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-422/
49
/ 100
moderate-risk
Severity
27/34 · High
Exploitability
15/34 · Moderate
Exposure
7/34 · Low