CVEvulnerability
CVE-2021-3492
7.8 HIGH
Official page ↗
- Status
- Modified
- Published
- 2021-04-17
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 8.8 HIGH — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- CVSS 3.1 ([email protected])
- 7.8 HIGH — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CVSS 2.0 ([email protected])
- 7.2 HIGH — AV:L/AC:L/Au:N/C:C/I:C/A:C
- Weaknesses
- CWE-401, CWE-415
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.
Affected configurations
• canonical ubuntu linux (< 18.04)
• canonical ubuntu linux (>= 18.04.1 < 20.04)
• canonical ubuntu linux (< 20.10)
Related
References
- http://packetstormsecurity.com/files/162614/Kernel-Live-Patch-Security-Notice-LSN-0077-1.html Third Party Advisory, VDB Entry
- https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/commit/?id=25c891a949bf918b59cbc6e4932015ba4c35c333 Mailing List, Patch, Vendor Advisory
- https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/commit/?id=8fee52ab9da87d82bc6de9ebb3480fff9b4d53e6 Mailing List, Patch, Vendor Advisory
- https://ubuntu.com/security/notices/USN-4917-1 Vendor Advisory
- https://www.openwall.com/lists/oss-security/2021/04/16/2 Mailing List, Third Party Advisory
- https://www.zerodayinitiative.com/advisories/ZDI-21-422/ Third Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/162614/Kernel-Live-Patch-Security-Notice-LSN-0077-1.html Third Party Advisory, VDB Entry
- https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/commit/?id=25c891a949bf918b59cbc6e4932015ba4c35c333 Mailing List, Patch, Vendor Advisory
- https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/commit/?id=8fee52ab9da87d82bc6de9ebb3480fff9b4d53e6 Mailing List, Patch, Vendor Advisory
- https://ubuntu.com/security/notices/USN-4917-1 Vendor Advisory
- https://www.openwall.com/lists/oss-security/2021/04/16/2 Mailing List, Third Party Advisory
- https://www.zerodayinitiative.com/advisories/ZDI-21-422/ Third Party Advisory, VDB Entry