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.

Related CPE's

o

canonical

ubuntu_linux

3

References

http://packetstormsecurity.com/files/162614/Kernel-Live-Patch-Security-Notice-LSN-0077-1.html

Third Party AdvisoryVDB Entry

https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/commit/?id=25c891a949bf918b59cbc6e4932015ba4c35c333

Mailing ListPatchVendor Advisory

https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/commit/?id=8fee52ab9da87d82bc6de9ebb3480fff9b4d53e6

Mailing ListPatchVendor Advisory

https://ubuntu.com/security/notices/USN-4917-1

Vendor Advisory

https://www.openwall.com/lists/oss-security/2021/04/16/2

Mailing ListThird Party Advisory

https://www.zerodayinitiative.com/advisories/ZDI-21-422/

Third Party AdvisoryVDB Entry

Weaknesses

[email protected]

Primary
CWE-401CWE-415

[email protected]

Secondary
CWE-401CWE-415

CVSS impact metrics

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

7.8 · High

  • CVSS V3.1

  • CVSS V3.0

  • CVSS V2.0

Information

Source identifier

[email protected]

Vulnerability status

Analyzed

Published

2021-04-17T05:15:13.113

4 years ago

Last modified

2021-05-21T16:08:32.527

4 years ago