High severity · published Nov 28, 2020
CVE-2020-29368
An issue was discovered in __split_huge_pmd in mm/huge_memory.c in the Linux kernel before 5.7.5
7.0
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
High
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 30% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
Kernel · Linux
4.5.5 before 4.9.228; 4.10 before 4.14.185; 4.15 before 4.19.129; 4.20 before 5.4.48; 5.5 before 5.7.5 · source: NVD
CB
Cloud Backup · Netapp
All versions, or not specified · source: NVD
ES
Element Software · Netapp
All versions, or not specified · source: NVD
HF
H410c Firmware · Netapp
All versions, or not specified · source: NVD
HB
Hci Bootstrap OS · Netapp
All versions, or not specified · source: NVD
HM
Hci Management Node · Netapp
All versions, or not specified · source: NVD
SO
Solidfire · Netapp
All versions, or not specified · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-29368
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-29368
Exploit
https://bugs.chromium.org/p/project-zero/issues/detail?id=2045
Release Notes
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.7.5
Patch
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c444eb564fb16645c172d550359cb3d75fe8a040
Third Party Advisory
https://security.netapp.com/advisory/ntap-20210108-0002/
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