CVE-2021-4037

Summary

A vulnerability was found in the fs/inode.c:inode_init_owner() function logic of the LInux kernel that allows local users to create files for the XFS file-system with an unintended group ownership and with group execution and SGID permission bits set, in a scenario where a directory is SGID and belongs to a certain group and is writable by a user who is not a member of this group. This can lead to excessive permissions granted in case when they should not. This vulnerability is similar to the previous CVE-2018-13405 and adds the missed fix for the XFS.

Affected Software

VendorProductVersion RangeStatus
Linuxkernel* < 5.4.241affected
Linuxkernel5.5 < 5.10.146affected
Linuxkernel5.12unaffected
Red HatRed Hat Enterprise Linux 80:4.18.0-372.9.1.rt7.166.el8 < *unaffected
Red HatRed Hat Enterprise Linux 80:4.18.0-372.9.1.el8 < *unaffected
Red HatRed Hat Enterprise Linux 8.4 Extended Update Support0:4.18.0-305.49.1.rt7.121.el8_4 < *unaffected
Red HatRed Hat Enterprise Linux 8.4 Extended Update Support0:4.18.0-305.49.1.el8_4 < *unaffected

Weaknesses

  • CWE-284: Improper Access Control

Workarounds

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

ADP Enrichment

CVE Program Container

Additional References

References