UBUNTU-CVE-2021-26930
An issue was discovered in the Linux kernel 3.11 through 5.10.16, as used by Xen. To service requests to the PV backend, the driver maps grant references provided by the frontend. In this process, errors may be encountered. In one case, an error encountered earlier might be discarded by later processing, resulting in the caller assuming successful mapping, and hence subsequent operations trying to access space that wasn't mapped. In another case, internal state would be insufficiently updated, preventing safe recovery from the error. This affects drivers/block/xen-blkback/blkback.c.
02 / AFFECTED SOFTWARE
Affected packages
92 explicit affected versions
50 explicit affected versions
6 explicit affected versions
6 explicit affected versions
57 explicit affected versions
191 explicit affected versions
64 explicit affected versions
23 explicit affected versions
44 explicit affected versions
17 explicit affected versions
74 explicit affected versions
23 explicit affected versions
1 explicit affected versions
1 explicit affected versions
17 explicit affected versions
1 explicit affected versions
7 explicit affected versions
12 explicit affected versions
1 explicit affected versions
25 explicit affected versions
33 explicit affected versions
60 explicit affected versions
24 explicit affected versions
19 explicit affected versions
10 explicit affected versions
10 explicit affected versions
59 explicit affected versions
41 explicit affected versions
1 explicit affected versions
5 explicit affected versions
1 explicit affected versions
29 explicit affected versions
13 explicit affected versions
58 explicit affected versions
1 explicit affected versions
27 explicit affected versions
33 explicit affected versions
10 explicit affected versions
43 explicit affected versions
11 explicit affected versions
94 explicit affected versions
66 explicit affected versions
25 explicit affected versions
2 explicit affected versions
61 explicit affected versions
21 explicit affected versions
1 explicit affected versions
125 explicit affected versions
5 explicit affected versions
20 explicit affected versions
1 explicit affected versions
23 explicit affected versions
15 explicit affected versions
1 explicit affected versions
15 explicit affected versions
1 explicit affected versions
20 explicit affected versions
7 explicit affected versions
81 explicit affected versions
14 explicit affected versions
44 explicit affected versions
16 explicit affected versions
10 explicit affected versions
38 explicit affected versions
9 explicit affected versions
103 explicit affected versions
15 explicit affected versions
38 explicit affected versions
74 explicit affected versions
51 explicit affected versions
11 explicit affected versions
42 explicit affected versions
14 explicit affected versions
43 explicit affected versions
1 explicit affected versions
89 explicit affected versions
12 explicit affected versions
18 explicit affected versions
4 explicit affected versions
5 explicit affected versions
1 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
An issue was discovered in the Linux kernel 3.11 through 5.10.16, as used by Xen. To service requests to the PV backend, the driver maps grant references provided by the frontend. In this process, errors may be encountered. In one case, an error encountered earlier might be discarded by later processing, resulting in the caller assuming successful mapping, and hence subsequent operations trying to access space that wasn't mapped. In another case, internal state would be insufficiently updated, preventing safe recovery from the error. This affects drivers/block/xen-blkback/blkback.c.
05 / REFERENCES
Further evidence
- http://xenbits.xen.org/xsa/advisory-365.html
- https://ubuntu.com/security/CVE-2021-26930
- https://ubuntu.com/security/notices/USN-4904-1
- https://ubuntu.com/security/notices/USN-4909-1
- https://ubuntu.com/security/notices/USN-4946-1
- https://ubuntu.com/security/notices/USN-4949-1
- https://www.cve.org/CVERecord?id=CVE-2021-26930
- https://www.openwall.com/lists/oss-security/2021/02/16/6