CVE-2020-29369

Severity: high (CVSS 7.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2020-11-28 · updated 2026-06-17
Weakness: CWE-362

Description

An issue was discovered in mm/mmap.c in the Linux kernel before 5.7.11. There is a race condition between certain expand functions (expand_downwards and expand_upwards) and page-table free operations from an munmap call, aka CID-246c320a8cfe.

Affected products

Linux kernel: from 4.20 before 5.4.54; from 5.5 before 5.7.11 — fixed in 5.4.54, 5.7.11
NetApp Hci Compute Node: all versions
NetApp Hci Management Node: all versions
NetApp Hci Storage Node: all versions
NetApp Solidfire: all versions

How to fix

Upgrade to a fixed version: Linux kernel 5.4.54, 5.7.11. Check the vendor advisory for mitigations.

References

http://www.openwall.com/lists/oss-security/2021/02/10/6
http://www.openwall.com/lists/oss-security/2021/02/19/8
https://bugs.chromium.org/p/project-zero/issues/detail?id=2056
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.7.11
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=246c320a8cfe0b11d81a4af38fa9985ef0cc9a4c
https://security.netapp.com/advisory/ntap-20210115-0001/
http://www.openwall.com/lists/oss-security/2021/02/10/6
http://www.openwall.com/lists/oss-security/2021/02/19/8
https://bugs.chromium.org/p/project-zero/issues/detail?id=2056
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.7.11
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=246c320a8cfe0b11d81a4af38fa9985ef0cc9a4c
https://security.netapp.com/advisory/ntap-20210115-0001/

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