CVE-2021-3492
8.8
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Ubuntu | Linux kernel | 5.8 kernel < 5.8.0-50.56 | affected |
| Ubuntu | Linux kernel | 5.4 kernel < 5.4.0-72.80 | affected |
Weaknesses
- CWE-415: CWE-415: Double Free
- CWE-401: CWE-401: Missing Release of Memory after Effective Lifetime
ADP Enrichment
CVE Program Container
Additional 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
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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