Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Canonical | Ubuntu Linux | < 18.04 |
Related Weaknesses (CWE)
References
- http://packetstormsecurity.com/files/162614/Kernel-Live-Patch-Security-Notice-LSThird Party AdvisoryVDB Entry
- https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/commit/Mailing ListPatchVendor Advisory
- https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/commit/Mailing ListPatchVendor Advisory
- https://ubuntu.com/security/notices/USN-4917-1Vendor Advisory
- https://www.openwall.com/lists/oss-security/2021/04/16/2Mailing ListThird Party Advisory
- https://www.zerodayinitiative.com/advisories/ZDI-21-422/Third Party AdvisoryVDB Entry
- http://packetstormsecurity.com/files/162614/Kernel-Live-Patch-Security-Notice-LSThird Party AdvisoryVDB Entry
- https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/commit/Mailing ListPatchVendor Advisory
- https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/commit/Mailing ListPatchVendor Advisory
- https://ubuntu.com/security/notices/USN-4917-1Vendor Advisory
- https://www.openwall.com/lists/oss-security/2021/04/16/2Mailing ListThird Party Advisory
- https://www.zerodayinitiative.com/advisories/ZDI-21-422/Third Party AdvisoryVDB Entry
FAQ
What is CVE-2021-3492?
CVE-2021-3492 is a vulnerability with a CVSS score of 8.8 (HIGH). 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 situ...
How severe is CVE-2021-3492?
CVE-2021-3492 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-3492?
Check the references section above for vendor advisories and patch information. Affected products include: Canonical Ubuntu Linux.