CVE-2020-29368

medium

Published 2021-11-09 · Modified 2021-11-12

CVSS v3

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CVSS v2

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VIR risk

5.5

Description

An issue was discovered in __split_huge_pmd in mm/huge_memory.c in the Linux kernel before 5.7.5. The copy-on-write implementation can grant unintended write access because of a race condition in a THP mapcount check, aka CID-c444eb564fb1.

Predictions

Exploit likelihood

20%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: alma — https://errata.almalinux.org/8/ALSA-2021-4356.html

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2020-29368

vendor Authored 2026-05-27

Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2020-29368.html

OS impact

OS	Version	Status	Fixed in
sles		affected
debian	bookworm	fixed	`5.7.6-1`
debian	bullseye	fixed	`5.7.6-1`
debian	forky	fixed	`5.7.6-1`
debian	sid	fixed	`5.7.6-1`
debian	trixie	fixed	`5.7.6-1`

References

Verify integrity in audit chain (admin only). AS-IS.