CVE-2021-20321: Race Condition
First published: Tue Oct 12 2021(Updated: )
A race condition accessing file object in the Linux kernel OverlayFS subsystem was found in the way users do rename in specific way with OverlayFS. A local user could use this flaw to crash the system.
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | <5.15 | |
| Linux Linux kernel | =5.15 | |
| Linux Linux kernel | =5.15-rc1 | |
| Linux Linux kernel | =5.15-rc2 | |
| Linux Linux kernel | =5.15-rc3 | |
| Linux Linux kernel | =5.15-rc4 | |
| Redhat Enterprise Linux | =7.0 | |
| Redhat Enterprise Linux | =8.0 | |
| Debian Debian Linux | =9.0 | |
| Debian Debian Linux | =10.0 | |
| redhat/kernel | <5.15 | 5.15 |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.112-1 6.11.5-1 6.11.7-1 |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=2013242
- https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html
- https://lore.kernel.org/all/20211011134508.748956131@linuxfoundation.org/
- https://www.debian.org/security/2022/dsa-5096
- https://launchpad.net/bugs/cve/CVE-2021-20321
- https://lore.kernel.org/all/20211011134508.748956131%40linuxfoundation.org/
- https://access.redhat.com/errata/RHSA-2021:5241
- https://access.redhat.com/errata/RHSA-2021:5227
- https://access.redhat.com/security/cve/cve-2021-20321
- https://git.kernel.org/linus/a295aef603e109a47af355477326bd41151765b6
- https://security-tracker.debian.org/tracker/CVE-2021-20321
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-20321
- https://nvd.nist.gov/vuln/detail/CVE-2021-20321
- https://ubuntu.com/security/CVE-2021-20321
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