CVE-2021-3732: Infoleak
First published: Thu Aug 12 2021(Updated: )
A flaw was found in the Linux kernel's OverlayFS subsystem in the way the user mounts the TmpFS filesystem with OverlayFS. This flaw allows a local user to gain access to hidden files that should not be accessible.
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel-rt | <0:4.18.0-348.rt7.130.el8 | 0:4.18.0-348.rt7.130.el8 |
| redhat/kernel | <0:4.18.0-348.el8 | 0:4.18.0-348.el8 |
| Linux Linux kernel | <5.14 | |
| Linux Linux kernel | =5.14 | |
| Linux Linux kernel | =5.14-rc1 | |
| Linux Linux kernel | =5.14-rc2 | |
| Linux Linux kernel | =5.14-rc3 | |
| Linux Linux kernel | =5.14-rc4 | |
| Linux Linux kernel | =5.14-rc5 | |
| redhat/kernel | <5.14 | 5.14 |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.11.10-1 6.12.5-1 |
Remedy
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.
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2021-3732 https://nvd.nist.gov/vuln/detail/CVE-2021-3732 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=427215d85e8d
- https://bugzilla.redhat.com/show_bug.cgi?id=1995249
- https://access.redhat.com/errata/RHSA-2021:4140
- https://access.redhat.com/errata/RHSA-2021:4356
- https://access.redhat.com/security/cve/cve-2021-3732
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=427215d85e8d1476da1a86b8d67aceb485eb3631
- https://github.com/torvalds/linux/commit/427215d85e8d1476da1a86b8d67aceb485eb3631
- https://ubuntu.com/security/CVE-2021-3732
- https://launchpad.net/bugs/cve/CVE-2021-3732
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=427215d85e8d
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1993131
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2000964
- https://git.kernel.org/linus/427215d85e8d1476da1a86b8d67aceb485eb3631
- https://security-tracker.debian.org/tracker/CVE-2021-3732
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3732
- https://nvd.nist.gov/vuln/detail/CVE-2021-3732
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