UBUNTU-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 implementation can grant unintended write access because of a race condition in a THP mapcount check, aka CID-c444eb564fb1.
02 / AFFECTED SOFTWARE
Affected packages
42 explicit affected versions
6 explicit affected versions
23 explicit affected versions
6 explicit affected versions
47 explicit affected versions
12 explicit affected versions
28 explicit affected versions
2 explicit affected versions
54 explicit affected versions
23 explicit affected versions
1 explicit affected versions
1 explicit affected versions
1 explicit affected versions
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5 explicit affected versions
1 explicit affected versions
12 explicit affected versions
16 explicit affected versions
18 explicit affected versions
12 explicit affected versions
4 explicit affected versions
10 explicit affected versions
27 explicit affected versions
26 explicit affected versions
1 explicit affected versions
22 explicit affected versions
13 explicit affected versions
9 explicit affected versions
44 explicit affected versions
1 explicit affected versions
14 explicit affected versions
23 explicit affected versions
23 explicit affected versions
10 explicit affected versions
11 explicit affected versions
12 explicit affected versions
47 explicit affected versions
4 explicit affected versions
51 explicit affected versions
1 explicit affected versions
51 explicit affected versions
5 explicit affected versions
60 explicit affected versions
1 explicit affected versions
6 explicit affected versions
2 explicit affected versions
1 explicit affected versions
2 explicit affected versions
1 explicit affected versions
5 explicit affected versions
2 explicit affected versions
29 explicit affected versions
44 explicit affected versions
16 explicit affected versions
26 explicit affected versions
9 explicit affected versions
38 explicit affected versions
9 explicit affected versions
2 explicit affected versions
73 explicit affected versions
37 explicit affected versions
2 explicit affected versions
43 explicit affected versions
1 explicit affected versions
12 explicit affected versions
6 explicit affected versions
4 explicit affected versions
1 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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.
05 / REFERENCES
Further evidence
- https://bugs.chromium.org/p/project-zero/issues/detail?id=2045
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.7.5
- https://git.kernel.org/linus/c444eb564fb16645c172d550359cb3d75fe8a040
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c444eb564fb16645c172d550359cb3d75fe8a040
- https://ubuntu.com/security/CVE-2020-29368
- https://ubuntu.com/security/notices/USN-4752-1
- https://www.cve.org/CVERecord?id=CVE-2020-29368