A flaw was found in the Linux kernels implementation of overlayfs where a local attacker with an unpriviledged account who has the ability to mount a filesystem can abuse a logic bug in the overlayfs code which can inadvertantly reveal files hidden in the orignal mount. References: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=427215d85e8d https://bugzilla.redhat.com/show_bug.cgi?id=1993131
Marking Hosted OCP 4.x affected/delegated. (3.x unaffected)
Created kernel tracking bugs for this issue: Affects: fedora-all [bug 2000964]
This was fixed for Fedora with the 5.13.11 stable kernel update.
This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2021:4140 https://access.redhat.com/errata/RHSA-2021:4140
This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2021:4356 https://access.redhat.com/errata/RHSA-2021:4356
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s): https://access.redhat.com/security/cve/cve-2021-3732