CVE-2020-27825: Race Condition
First published: Mon Dec 07 2020(Updated: )
A flaw was found in the Linux Kernel. A use-after-free vulnerability was discovered in the ftrace ring buffer resizing logic due to a race condition. Reference and upstream patch: <a href="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=bbeb97464eefc65f506084fd9f18f21653e01137">https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=bbeb97464eefc65f506084fd9f18f21653e01137</a>
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <5.10 | 5.10 |
| Linux Linux kernel | =5.10-rc1 | |
| Redhat Enterprise Linux | =7.0 | |
| Redhat Enterprise Linux | =8.0 | |
| Redhat Enterprise Mrg | =2.0 | |
| Debian Debian Linux | =9.0 | |
| Debian Debian Linux | =10.0 | |
| Netapp Cloud Backup | ||
| Netapp Solidfire Baseboard Management Controller Firmware | ||
| Netapp Solidfire Baseboard Management Controller | ||
| Netapp H410c Firmware | ||
| Netapp H410c | ||
| debian/linux | 4.19.249-2 4.19.289-2 5.10.197-1 5.10.191-1 6.1.66-1 6.1.69-1 6.5.13-1 6.6.8-1 |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=1905155
- https://lists.debian.org/debian-lts-announce/2021/02/msg00018.html
- https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html
- https://security.netapp.com/advisory/ntap-20210521-0008/
- https://www.debian.org/security/2021/dsa-4843
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=bbeb97464eefc65f506084fd9f18f21653e01137
- https://git.kernel.org/linus/bbeb97464eefc65f506084fd9f18f21653e01137
- https://security-tracker.debian.org/tracker/CVE-2020-27825
Frequently Asked Questions
What is CVE-2020-27825?
CVE-2020-27825 is a use-after-free flaw found in kernel/trace/ring_buffer.c in the Linux kernel (before 5.10-rc1).
What is the impact of CVE-2020-27825?
CVE-2020-27825 can cause a denial of service (DOS) and may allow a local attacker to execute arbitrary code.
How does CVE-2020-27825 occur?
CVE-2020-27825 occurs due to a race condition in trace_open and resize of cpu buffer running simultaneously on different CPUs.
Which versions of Linux kernel are affected by CVE-2020-27825?
Versions before 5.10-rc1 of the Linux kernel are affected by CVE-2020-27825.
How can I fix CVE-2020-27825?
To fix CVE-2020-27825, update your Linux kernel to version 5.10-rc1 or later.
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