UBUNTU-CVE-2024-49856
In the Linux kernel, the following vulnerability has been resolved: x86/sgx: Fix deadlock in SGX NUMA node search When the current node doesn't have an EPC section configured by firmware and all other EPC sections are used up, CPU can get stuck inside the while loop that looks for an available EPC page from remote nodes indefinitely, leading to a soft lockup. Note how nid_of_current will never be equal to nid in that while loop because nid_of_current is not set in sgx_numa_mask. Also worth mentioning is that it's perfectly fine for the firmware not to setup an EPC section on a node. While setting up an EPC section on each node can enhance performance, it is not a requirement for functionality. Rework the loop to start and end on *a* node that has SGX memory. This avoids the deadlock looking for the current SGX-lacking node to show up in the loop when it never will.
02 / AFFECTED SOFTWARE
Affected packages
33 explicit affected versions
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20 explicit affected versions
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20 explicit affected versions
16 explicit affected versions
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16 explicit affected versions
3 explicit affected versions
13 explicit affected versions
26 explicit affected versions
45 explicit affected versions
7 explicit affected versions
37 explicit affected versions
21 explicit affected versions
14 explicit affected versions
38 explicit affected versions
49 explicit affected versions
29 explicit affected versions
48 explicit affected versions
11 explicit affected versions
11 explicit affected versions
7 explicit affected versions
56 explicit affected versions
15 explicit affected versions
54 explicit affected versions
13 explicit affected versions
43 explicit affected versions
10 explicit affected versions
8 explicit affected versions
14 explicit affected versions
4 explicit affected versions
11 explicit affected versions
1 explicit affected versions
12 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
In the Linux kernel, the following vulnerability has been resolved: x86/sgx: Fix deadlock in SGX NUMA node search When the current node doesn't have an EPC section configured by firmware and all other EPC sections are used up, CPU can get stuck inside the while loop that looks for an available EPC page from remote nodes indefinitely, leading to a soft lockup. Note how nid_of_current will never be equal to nid in that while loop because nid_of_current is not set in sgx_numa_mask. Also worth mentioning is that it's perfectly fine for the firmware not to setup an EPC section on a node. While setting up an EPC section on each node can enhance performance, it is not a requirement for functionality. Rework the loop to start and end on *a* node that has SGX memory. This avoids the deadlock looking for the current SGX-lacking node to show up in the loop when it never will.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/9c936844010466535bd46ea4ce4656ef17653644
- https://git.kernel.org/stable/c/0f89fb4042c08fd143bfc28af08bf6c8a0197eea
- https://git.kernel.org/stable/c/20c96d0aaabfe361fc2a11c173968dc67feadbbf
- https://git.kernel.org/stable/c/40fb64257dab507d86b5f1f2a62f3669ef0c91a8
- https://git.kernel.org/stable/c/8132510c915815e6b537ab937d94ed66893bc7b8
- https://git.kernel.org/stable/c/9c936844010466535bd46ea4ce4656ef17653644
- https://git.kernel.org/stable/c/fb2d057539eda67ec7cfc369bf587e6518a9b99d
- https://ubuntu.com/security/CVE-2024-49856
- https://ubuntu.com/security/notices/USN-7166-1
- https://ubuntu.com/security/notices/USN-7166-2
- https://ubuntu.com/security/notices/USN-7166-3
- https://ubuntu.com/security/notices/USN-7166-4
- https://ubuntu.com/security/notices/USN-7186-1
- https://ubuntu.com/security/notices/USN-7186-2
- https://ubuntu.com/security/notices/USN-7194-1
- https://ubuntu.com/security/notices/USN-7276-1
- https://ubuntu.com/security/notices/USN-7277-1
- https://ubuntu.com/security/notices/USN-7301-1
- https://ubuntu.com/security/notices/USN-7303-1
- https://ubuntu.com/security/notices/USN-7303-2
- https://ubuntu.com/security/notices/USN-7303-3
- https://ubuntu.com/security/notices/USN-7304-1
- https://ubuntu.com/security/notices/USN-7310-1
- https://ubuntu.com/security/notices/USN-7311-1
- https://ubuntu.com/security/notices/USN-7384-1
- https://ubuntu.com/security/notices/USN-7384-2
- https://ubuntu.com/security/notices/USN-7385-1
- https://ubuntu.com/security/notices/USN-7386-1
- https://ubuntu.com/security/notices/USN-7403-1
- https://ubuntu.com/security/notices/USN-7468-1
- https://www.cve.org/CVERecord?id=CVE-2024-49856