Vulnerability · Published May 26, 2021 · Assigned by redhat
CVE-2020-25668
High 7.0
In plain English
A high-severity race condition in Linux Kernel. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 64% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)7.0High
Exploit odds (30 days)1.0%top 36.2% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
A flaw was found in Linux Kernel because access to the global variable fg_console is not properly synchronized leading to a use after free in con_font_op.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | linux | 5.9.6-1 | DEBIAN-CVE-2020-25668 |
| Debian:13 | linux | 5.9.6-1 | DEBIAN-CVE-2020-25668 |
| Debian:14 | linux | 5.9.6-1 | DEBIAN-CVE-2020-25668 |
| Ubuntu:22.04:LTS | linux-intel-iot-realtime | no fix listed | UBUNTU-CVE-2020-25668 |
| Ubuntu:24.04:LTS | linux-raspi-realtime | no fix listed | UBUNTU-CVE-2020-25668 |
| Ubuntu:22.04:LTS | linux-realtime | no fix listed | UBUNTU-CVE-2020-25668 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| n/a | Linux Kernel | 5.9.2 |
Weakness: CWE-362
References
- [oss-security] 20201030 CVE-2020-25668: Linux kernel concurrency use-after-free in vt mailing-list, x_refsource_MLIST
- [oss-security] 20201104 Re: CVE-2020-25668: Linux kernel concurrency use-after-free in vt mailing-list, x_refsource_MLIST
- [debian-lts-announce] 20201210 [SECURITY] [DLA 2483-1] linux-4.19 security update mailing-list, x_refsource_MLIST
- [debian-lts-announce] 20201218 [SECURITY] [DLA 2494-1] linux security update mailing-list, x_refsource_MLIST
- https://www.openwall.com/lists/oss-security/2020/11/04/3%2C x_refsource_MISC
- https://www.openwall.com/lists/oss-security/2020/10/30/1%2C x_refsource_MISC
- https://bugzilla.redhat.com/show_bug.cgi?id=1893287%2C x_refsource_MISC
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=90bfdeef83f1d6c696039b6a917190dcbbad3220 x_refsource_MISC
- https://security.netapp.com/advisory/ntap-20210702-0005/ x_refsource_CONFIRM