UBUNTU-CVE-2023-31084
An issue was discovered in drivers/media/dvb-core/dvb_frontend.c in the Linux kernel 6.2. There is a blocking operation when a task is in !TASK_RUNNING. In dvb_frontend_get_event, wait_event_interruptible is called; the condition is dvb_frontend_test_event(fepriv,events). In dvb_frontend_test_event, down(&fepriv->sem) is called. However, wait_event_interruptible would put the process to sleep, and down(&fepriv->sem) may block the process.
02 / AFFECTED SOFTWARE
Affected packages
19 explicit affected versions
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13 explicit affected versions
29 explicit affected versions
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30 explicit affected versions
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43 explicit affected versions
29 explicit affected versions
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131 explicit affected versions
10 explicit affected versions
8 explicit affected versions
6 explicit affected versions
63 explicit affected versions
4 explicit affected versions
52 explicit affected versions
1 explicit affected versions
34 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
An issue was discovered in drivers/media/dvb-core/dvb_frontend.c in the Linux kernel 6.2. There is a blocking operation when a task is in !TASK_RUNNING. In dvb_frontend_get_event, wait_event_interruptible is called; the condition is dvb_frontend_test_event(fepriv,events). In dvb_frontend_test_event, down(&fepriv->sem) is called. However, wait_event_interruptible would put the process to sleep, and down(&fepriv->sem) may block the process.
05 / REFERENCES
Further evidence
- https://lore.kernel.org/all/CA+UBctCu7fXn4q41O_3=id1+OdyQ85tZY1x+TkT-6OVBL6KAUw@mail.gmail.com/
- https://ubuntu.com/security/CVE-2023-31084
- https://ubuntu.com/security/notices/USN-6231-1
- https://ubuntu.com/security/notices/USN-6309-1
- https://ubuntu.com/security/notices/USN-6327-1
- https://ubuntu.com/security/notices/USN-6338-1
- https://ubuntu.com/security/notices/USN-6338-2
- https://ubuntu.com/security/notices/USN-6339-1
- https://ubuntu.com/security/notices/USN-6339-2
- https://ubuntu.com/security/notices/USN-6339-3
- https://ubuntu.com/security/notices/USN-6339-4
- https://ubuntu.com/security/notices/USN-6340-1
- https://ubuntu.com/security/notices/USN-6340-2
- https://ubuntu.com/security/notices/USN-6342-1
- https://ubuntu.com/security/notices/USN-6342-2
- https://ubuntu.com/security/notices/USN-6344-1
- https://ubuntu.com/security/notices/USN-6349-1
- https://ubuntu.com/security/notices/USN-6350-1
- https://ubuntu.com/security/notices/USN-6351-1
- https://ubuntu.com/security/notices/USN-6357-1
- https://ubuntu.com/security/notices/USN-6397-1
- https://www.cve.org/CVERecord?id=CVE-2023-31084