CVE-2021-3492
Summary
| CVE | CVE-2021-3492 |
|---|---|
| State | PUBLIC |
| Assigner | [email protected] |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2021-04-17 05:15:00 UTC |
| Updated | 2021-05-21 16:08:00 UTC |
| 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. |
Risk And Classification
Problem Types: CWE-415 | CWE-401
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Operating System | Canonical | Ubuntu Linux | All | All | All | All |
| Operating System | Canonical | Ubuntu Linux | All | All | All | All |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| ~ubuntu-kernel/ubuntu/+source/linux/+git/focal - [no description] | MISC | git.launchpad.net | |
| ~ubuntu-kernel/ubuntu/+source/linux/+git/focal - [no description] | MISC | git.launchpad.net | |
| oss-security - [CVE-2021-3492] Ubuntu shiftfs Linux kernel file system double free vulnerability | MISC | www.openwall.com | |
| Kernel Live Patch Security Notice LSN-0077-1 ≈ Packet Storm | MISC | packetstormsecurity.com | |
| ZDI-21-422 | Zero Day Initiative | MISC | www.zerodayinitiative.com | |
| USN-4917-1: Linux kernel vulnerabilities | Ubuntu security notices | Ubuntu | MISC | ubuntu.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
LEGACY: Vincent Dehors of Synactiv Digital Security