UBUNTU-CVE-2023-34324
Closing of an event channel in the Linux kernel can result in a deadlock. This happens when the close is being performed in parallel to an unrelated Xen console action and the handling of a Xen console interrupt in an unprivileged guest. The closing of an event channel is e.g. triggered by removal of a paravirtual device on the other side. As this action will cause console messages to be issued on the other side quite often, the chance of triggering the deadlock is not neglectable. Note that 32-bit Arm-guests are not affected, as the 32-bit Linux kernel on Arm doesn't use queued-RW-locks, which are required to trigger the issue (on Arm32 a waiting writer doesn't block further readers to get the lock).
02 / AFFECTED SOFTWARE
Affected packages
23 explicit affected versions
35 explicit affected versions
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6 explicit affected versions
12 explicit affected versions
8 explicit affected versions
6 explicit affected versions
44 explicit affected versions
30 explicit affected versions
52 explicit affected versions
41 explicit affected versions
30 explicit affected versions
37 explicit affected versions
7 explicit affected versions
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13 explicit affected versions
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35 explicit affected versions
1 explicit affected versions
12 explicit affected versions
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24 explicit affected versions
80 explicit affected versions
13 explicit affected versions
4 explicit affected versions
121 explicit affected versions
23 explicit affected versions
1 explicit affected versions
21 explicit affected versions
9 explicit affected versions
16 explicit affected versions
10 explicit affected versions
35 explicit affected versions
7 explicit affected versions
12 explicit affected versions
111 explicit affected versions
28 explicit affected versions
12 explicit affected versions
14 explicit affected versions
7 explicit affected versions
69 explicit affected versions
12 explicit affected versions
83 explicit affected versions
91 explicit affected versions
12 explicit affected versions
80 explicit affected versions
120 explicit affected versions
7 explicit affected versions
37 explicit affected versions
13 explicit affected versions
10 explicit affected versions
17 explicit affected versions
21 explicit affected versions
26 explicit affected versions
13 explicit affected versions
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3 explicit affected versions
29 explicit affected versions
72 explicit affected versions
13 explicit affected versions
41 explicit affected versions
67 explicit affected versions
40 explicit affected versions
83 explicit affected versions
2 explicit affected versions
33 explicit affected versions
23 explicit affected versions
10 explicit affected versions
188 explicit affected versions
11 explicit affected versions
12 explicit affected versions
7 explicit affected versions
12 explicit affected versions
82 explicit affected versions
138 explicit affected versions
30 explicit affected versions
22 explicit affected versions
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38 explicit affected versions
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10 explicit affected versions
26 explicit affected versions
17 explicit affected versions
1 explicit affected versions
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41 explicit affected versions
16 explicit affected versions
41 explicit affected versions
31 explicit affected versions
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3 explicit affected versions
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2 explicit affected versions
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12 explicit affected versions
27 explicit affected versions
18 explicit affected versions
14 explicit affected versions
1 explicit affected versions
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8 explicit affected versions
2 explicit affected versions
5 explicit affected versions
8 explicit affected versions
10 explicit affected versions
2 explicit affected versions
71 explicit affected versions
13 explicit affected versions
36 explicit affected versions
7 explicit affected versions
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94 explicit affected versions
33 explicit affected versions
10 explicit affected versions
10 explicit affected versions
12 explicit affected versions
70 explicit affected versions
44 explicit affected versions
16 explicit affected versions
3 explicit affected versions
13 explicit affected versions
26 explicit affected versions
27 explicit affected versions
37 explicit affected versions
14 explicit affected versions
38 explicit affected versions
167 explicit affected versions
31 explicit affected versions
9 explicit affected versions
31 explicit affected versions
11 explicit affected versions
38 explicit affected versions
8 explicit affected versions
7 explicit affected versions
12 explicit affected versions
97 explicit affected versions
42 explicit affected versions
121 explicit affected versions
4 explicit affected versions
1 explicit affected versions
1 explicit affected versions
36 explicit affected versions
2 explicit affected versions
43 explicit affected versions
37 explicit affected versions
10 explicit affected versions
8 explicit affected versions
14 explicit affected versions
71 explicit affected versions
4 explicit affected versions
60 explicit affected versions
3 explicit affected versions
1 explicit affected versions
69 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
Closing of an event channel in the Linux kernel can result in a deadlock. This happens when the close is being performed in parallel to an unrelated Xen console action and the handling of a Xen console interrupt in an unprivileged guest. The closing of an event channel is e.g. triggered by removal of a paravirtual device on the other side. As this action will cause console messages to be issued on the other side quite often, the chance of triggering the deadlock is not neglectable. Note that 32-bit Arm-guests are not affected, as the 32-bit Linux kernel on Arm doesn't use queued-RW-locks, which are required to trigger the issue (on Arm32 a waiting writer doesn't block further readers to get the lock).
05 / REFERENCES
Further evidence
- https://ubuntu.com/security/CVE-2023-34324
- https://ubuntu.com/security/notices/USN-6461-1
- https://ubuntu.com/security/notices/USN-6624-1
- https://ubuntu.com/security/notices/USN-6625-1
- https://ubuntu.com/security/notices/USN-6625-2
- https://ubuntu.com/security/notices/USN-6625-3
- https://ubuntu.com/security/notices/USN-6626-1
- https://ubuntu.com/security/notices/USN-6626-2
- https://ubuntu.com/security/notices/USN-6626-3
- https://ubuntu.com/security/notices/USN-6628-1
- https://ubuntu.com/security/notices/USN-6628-2
- https://ubuntu.com/security/notices/USN-6652-1
- https://www.cve.org/CVERecord?id=CVE-2023-34324
- https://xenbits.xen.org/xsa/advisory-441.html