What’s Vulnerable › Vulnerabilities

CVE-2020-36387

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-06-07 · updated 2026-06-17
• Weakness: CWE-416

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.

Affected products

• Linux kernel: from 5.7 before 5.7.16; from 5.8 before 5.8.2 — fixed in 5.7.16, 5.8.2
• NetApp H300E Firmware: all versions
• NetApp H300S Firmware: all versions
• NetApp H410C Firmware: all versions
• NetApp H410S Firmware: all versions
• NetApp H500E Firmware: all versions
• NetApp H500S Firmware: all versions
• NetApp H700E Firmware: all versions
• NetApp H700S Firmware: all versions

How to fix

Upgrade to a fixed version: Linux kernel 5.7.16, 5.8.2. Check the vendor advisory for mitigations.

References

• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.2
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6d816e088c359866f9867057e04f244c608c42fe
• https://security.netapp.com/advisory/ntap-20210727-0006/
• https://sites.google.com/view/syzscope/kasan-use-after-free-read-in-io_async_task_func
• https://syzkaller.appspot.com/bug?id=ce5f07d6ec3b5050b8f0728a3b389aa510f2591b
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.2
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6d816e088c359866f9867057e04f244c608c42fe
• https://security.netapp.com/advisory/ntap-20210727-0006/
• https://sites.google.com/view/syzscope/kasan-use-after-free-read-in-io_async_task_func
• https://syzkaller.appspot.com/bug?id=ce5f07d6ec3b5050b8f0728a3b389aa510f2591b

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