UBUNTU-CVE-2021-26931
An issue was discovered in the Linux kernel 2.6.39 through 5.10.16, as used in Xen. Block, net, and SCSI backends consider certain errors a plain bug, deliberately causing a kernel crash. For errors potentially being at least under the influence of guests (such as out of memory conditions), it isn't correct to assume a plain bug. Memory allocations potentially causing such crashes occur only when Linux is running in PV mode, though. This affects drivers/block/xen-blkback/blkback.c and drivers/xen/xen-scsiback.c.
02 / AFFECTED SOFTWARE
Affected packages
50 explicit affected versions
6 explicit affected versions
6 explicit affected versions
57 explicit affected versions
191 explicit affected versions
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44 explicit affected versions
17 explicit affected versions
74 explicit affected versions
23 explicit affected versions
1 explicit affected versions
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1 explicit affected versions
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1 explicit affected versions
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10 explicit affected versions
10 explicit affected versions
59 explicit affected versions
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1 explicit affected versions
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1 explicit affected versions
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13 explicit affected versions
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1 explicit affected versions
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33 explicit affected versions
10 explicit affected versions
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66 explicit affected versions
25 explicit affected versions
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21 explicit affected versions
1 explicit affected versions
125 explicit affected versions
5 explicit affected versions
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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
92 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
An issue was discovered in the Linux kernel 2.6.39 through 5.10.16, as used in Xen. Block, net, and SCSI backends consider certain errors a plain bug, deliberately causing a kernel crash. For errors potentially being at least under the influence of guests (such as out of memory conditions), it isn't correct to assume a plain bug. Memory allocations potentially causing such crashes occur only when Linux is running in PV mode, though. This affects drivers/block/xen-blkback/blkback.c and drivers/xen/xen-scsiback.c.
05 / REFERENCES
Further evidence
- https://ubuntu.com/security/CVE-2021-26931
- 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-2021-26931
- https://www.openwall.com/lists/oss-security/2021/02/16/4
- https://xenbits.xen.org/xsa/advisory-362.html