Vulnerability · Published May 26, 2021 · Assigned by redhat
CVE-2020-25669
High 7.8
In plain English
A high-severity use-after-free 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 0.6% (higher than 50% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)7.8High
Exploit odds (30 days)0.6%top 49.8% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
A vulnerability was found in the Linux Kernel where the function sunkbd_reinit having been scheduled by sunkbd_interrupt before sunkbd being freed. Though the dangling pointer is set to NULL in sunkbd_disconnect, there is still an alias in sunkbd_reinit causing Use After Free.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | linux | 5.9.11-1 | DEBIAN-CVE-2020-25669 |
| Debian:13 | linux | 5.9.11-1 | DEBIAN-CVE-2020-25669 |
| Debian:14 | linux | 5.9.11-1 | DEBIAN-CVE-2020-25669 |
| Ubuntu:22.04:LTS | linux-intel-iot-realtime | no fix listed | UBUNTU-CVE-2020-25669 |
| Ubuntu:24.04:LTS | linux-raspi-realtime | no fix listed | UBUNTU-CVE-2020-25669 |
| Ubuntu:22.04:LTS | linux-realtime | no fix listed | UBUNTU-CVE-2020-25669 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| n/a | Linux Kernel | 5.9.4 |
Weakness: CWE-416
References
- [oss-security] 20201105 CVE-2020-25669: Linux Kernel use-after-free in sunkbd_reinit mailing-list, x_refsource_MLIST
- [oss-security] 20201120 Re: CVE-2020-25669: Linux Kernel use-after-free in sunkbd_reinit 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/2020/11/05/2%2C x_refsource_MISC
- https://www.openwall.com/lists/oss-security/2020/11/20/5%2C x_refsource_MISC
- https://github.com/torvalds/linux/commit/77e70d351db7de07a46ac49b87a6c3c7a60fca7e x_refsource_MISC
- https://security.netapp.com/advisory/ntap-20210702-0006/ x_refsource_CONFIRM