CVE-2020-36387
HIGHCVSS 7.8/10EPSS 0.39%
Last modified
CVE-2020-36387 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. An issue was discovered in the Linux kernel before 5.8.2. fs/io_uring.c has a use-after-free related to io_async_task_func and ctx reference holding, aka CID-6d816e088c35.. EPSS estimates a 0.39% chance of exploitation in the next 30 days.
Description
An issue was discovered in the Linux kernel before 5.8.2. fs/io_uring.c has a use-after-free related to io_async_task_func and ctx reference holding, aka CID-6d816e088c35.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 5.7, < 5.7.16 |
| Linux | Linux Kernel | >= 5.8, < 5.8.2 |
| Netapp | H300s Firmware | All versions |
| Netapp | H500s Firmware | All versions |
| Netapp | H700s Firmware | All versions |
| Netapp | H300e Firmware | All versions |
| Netapp | H500e Firmware | All versions |
| Netapp | H700e Firmware | All versions |
| Netapp | H410s Firmware | All versions |
| Netapp | H410c Firmware | All versions |
References
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.2Mailing List, Patch, Release Notes, Vendor Advisory
- https://security.netapp.com/advisory/ntap-20210727-0006/Third Party Advisory
- https://sites.google.com/view/syzscope/kasan-use-after-free-read-in-io_async_task_funcPatch, Third Party Advisory
- https://syzkaller.appspot.com/bug?id=ce5f07d6ec3b5050b8f0728a3b389aa510f2591bPatch, Third Party Advisory
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.2Mailing List, Patch, Release Notes, Vendor Advisory
- https://security.netapp.com/advisory/ntap-20210727-0006/Third Party Advisory
- https://sites.google.com/view/syzscope/kasan-use-after-free-read-in-io_async_task_funcPatch, Third Party Advisory
- https://syzkaller.appspot.com/bug?id=ce5f07d6ec3b5050b8f0728a3b389aa510f2591bPatch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2020-36387?
An issue was discovered in the Linux kernel before 5.8.2. fs/io_uring.c has a use-after-free related to io_async_task_func and ctx reference holding, aka CID-6d816e088c35.
How severe is CVE-2020-36387?
CVE-2020-36387 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.39% probability of exploitation in the next 30 days.
How do I fix CVE-2020-36387?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
Are you affected by CVE-2020-36387?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST