What’s Vulnerable › Vulnerabilities

CVE-2020-27815

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-05-26 · updated 2026-06-17
• Weakness: CWE-119

Description

A flaw was found in the JFS filesystem code in the Linux Kernel which allows a local attacker with the ability to set extended attributes to panic the system, causing memory corruption or escalating privileges. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

Affected products

• Debian Linux: 9.0, 10.0
• Linux kernel: from 4.4.249 (excl.); from 4.5 before 4.9.249; from 4.10 before 4.14.213; from 4.15 before 4.19.164; from 4.20 before 5.4.86; from 5.5 before 5.10.4 — fixed in 4.14.213, 4.19.164, 4.9.249, 5.10.4, 5.4.86
• NetApp Aff A250 Firmware: all versions
• NetApp Fas500F Firmware: all versions
• 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 4.14.213, 4.19.164, 4.9.249, 5.10.4. Check the vendor advisory for mitigations.

References

• http://www.openwall.com/lists/oss-security/2020/11/30/5
• http://www.openwall.com/lists/oss-security/2020/12/28/1
• https://bugzilla.redhat.com/show_bug.cgi?id=1897668%2C
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c61b3e4839007668360ed8b87d7da96d2e59fc6c
• 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-20210702-0004/
• https://www.debian.org/security/2021/dsa-4843
• https://www.openwall.com/lists/oss-security/2020/11/30/5%2C
• https://www.openwall.com/lists/oss-security/2020/12/28/1%2C
• http://www.openwall.com/lists/oss-security/2020/11/30/5
• http://www.openwall.com/lists/oss-security/2020/12/28/1

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