Home/CVE/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 impl
CVE

CVE-2020-29368

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 impl

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.

HIGH · CVSS 7 EPSS 0.00102
Act now
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
▤

Affected Products & Versions

11
linux kernel>= 4.5.5 and < 4.9.228
linux kernel>= 4.10 and < 4.14.185
linux kernel>= 4.15 and < 4.19.129
linux kernel>= 4.20 and < 5.4.48
linux kernel>= 5.5 and < 5.7.5
netapp cloud backupall versions
netapp element softwareall versions
netapp hci management nodeall versions
⚠

Public Exploits & PoCs

1
pocbugs.chromium.org · detail?id=2045bugs.chromium.org
▣

Scoring & Timeline

7
HIGH · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD28 Nov 2020 · 07:15 AM
CVSS VectorCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
⚑

Vendor Advisories

30
rhsaRHSA-2021:4356Low
rhsaRHSA-2022:5626Moderate
rhsaRHSA-2022:5220Moderate
rhsaRHSA-2021:4140Low
rhsaRHSA-2022:5224Important
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.7.5Release NotesVendor Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c444eb564fb16645c172d550359cb3d75fe8a040PatchVendor Advisory
https://security.netapp.com/advisory/ntap-20210108-0002/Third Party Advisory
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