CVE-2021-3492
Ubuntu linux kernel shiftfs file system double free vulnerability
- State
- Published
- Severity
- 8.8 High
- Published
- Apr 17, 2021
- Updated
- Sep 17, 2024
- Reserved
- Apr 9, 2021
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 8.8 High | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H | canonical |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
Linux kernelUbuntu |
|
References
- https://www.openwall.com/lists/oss-security/2021/04/16/2
- https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/commit/?id=8fee52ab9da87d82bc6de9ebb3480fff9b4d53e6
- https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/commit/?id=25c891a949bf918b59cbc6e4932015ba4c35c333
- https://ubuntu.com/security/notices/USN-4917-1
- https://www.zerodayinitiative.com/advisories/ZDI-21-422/
- http://packetstormsecurity.com/files/162614/Kernel-Live-Patch-Security-Notice-LSN-0077-1.html
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