High severity8.8NVD Advisory· Published Apr 17, 2021· Updated Jun 17, 2026
CVE-2021-3492
CVE-2021-3492
Description
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
4cpe:2.3:o:canonical:ubuntu_linux:*:*:*:*:-:*:*:*+ 1 more
- cpe:2.3:o:canonical:ubuntu_linux:*:*:*:*:-:*:*:*range: <20.10
- cpe:2.3:o:canonical:ubuntu_linux:*:*:*:*:lts:*:*:*range: <18.04
- Range: 5.8 kernel
Patches
Vulnerability mechanics
References
6- git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/commit/nvdMailing ListPatchVendor Advisory
- git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/commit/nvdMailing ListPatchVendor Advisory
- packetstormsecurity.com/files/162614/Kernel-Live-Patch-Security-Notice-LSN-0077-1.htmlnvdThird Party AdvisoryVDB Entry
- ubuntu.com/security/notices/USN-4917-1nvdVendor Advisory
- www.openwall.com/lists/oss-security/2021/04/16/2nvdMailing ListThird Party Advisory
- www.zerodayinitiative.com/advisories/ZDI-21-422/nvdThird Party AdvisoryVDB Entry
News mentions
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