UBUNTU-CVE-2020-10766
A logic bug flaw was found in Linux kernel before 5.8-rc1 in the implementation of SSBD. A bug in the logic handling allows an attacker with a local account to disable SSBD protection during a context switch when additional speculative execution mitigations are in place. This issue was introduced when the per task/process conditional STIPB switching was added on top of the existing SSBD switching. The highest threat from this vulnerability is to confidentiality.
02 / AFFECTED SOFTWARE
Affected packages
81 explicit affected versions
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
7 explicit affected versions
5 explicit affected versions
1 explicit affected versions
12 explicit affected versions
16 explicit affected versions
49 explicit affected versions
18 explicit affected versions
12 explicit affected versions
4 explicit affected versions
10 explicit affected versions
27 explicit affected versions
48 explicit affected versions
26 explicit affected versions
1 explicit affected versions
7 explicit affected versions
12 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
6 explicit affected versions
11 explicit affected versions
83 explicit affected versions
12 explicit affected versions
2 explicit affected versions
47 explicit affected versions
4 explicit affected versions
51 explicit affected versions
1 explicit affected versions
112 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
70 explicit affected versions
2 explicit affected versions
29 explicit affected versions
44 explicit affected versions
14 explicit affected versions
26 explicit affected versions
9 explicit affected versions
38 explicit affected versions
8 explicit affected versions
90 explicit affected versions
2 explicit affected versions
73 explicit affected versions
25 explicit affected versions
37 explicit affected versions
2 explicit affected versions
31 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
A logic bug flaw was found in Linux kernel before 5.8-rc1 in the implementation of SSBD. A bug in the logic handling allows an attacker with a local account to disable SSBD protection during a context switch when additional speculative execution mitigations are in place. This issue was introduced when the per task/process conditional STIPB switching was added on top of the existing SSBD switching. The highest threat from this vulnerability is to confidentiality.
05 / REFERENCES
Further evidence
- https://ubuntu.com/security/CVE-2020-10766
- https://ubuntu.com/security/notices/USN-4427-1
- https://ubuntu.com/security/notices/USN-4439-1
- https://ubuntu.com/security/notices/USN-4440-1
- https://ubuntu.com/security/notices/USN-4483-1
- https://ubuntu.com/security/notices/USN-4485-1
- https://www.cve.org/CVERecord?id=CVE-2020-10766
- https://www.openwall.com/lists/oss-security/2020/06/10/1
- https://www.theregister.com/2020/06/09/linux_kernel_bugs_spectre