CVE-2024-49856
"Linux Kernel x86 SGX NUMA Deadlock"
Description
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.
INFO
Published Date :
Oct. 21, 2024, 1:15 p.m.
Last Modified :
Oct. 23, 2024, 4:33 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
3.6
Exploitability Score :
1.8
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2024-49856.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2024-49856 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2024-49856 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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Initial Analysis by [email protected]
Oct. 23, 2024
Action Type Old Value New Value Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Changed Reference Type https://git.kernel.org/stable/c/0f89fb4042c08fd143bfc28af08bf6c8a0197eea No Types Assigned https://git.kernel.org/stable/c/0f89fb4042c08fd143bfc28af08bf6c8a0197eea Patch Changed Reference Type https://git.kernel.org/stable/c/20c96d0aaabfe361fc2a11c173968dc67feadbbf No Types Assigned https://git.kernel.org/stable/c/20c96d0aaabfe361fc2a11c173968dc67feadbbf Patch Changed Reference Type https://git.kernel.org/stable/c/40fb64257dab507d86b5f1f2a62f3669ef0c91a8 No Types Assigned https://git.kernel.org/stable/c/40fb64257dab507d86b5f1f2a62f3669ef0c91a8 Patch Changed Reference Type https://git.kernel.org/stable/c/8132510c915815e6b537ab937d94ed66893bc7b8 No Types Assigned https://git.kernel.org/stable/c/8132510c915815e6b537ab937d94ed66893bc7b8 Patch Changed Reference Type https://git.kernel.org/stable/c/9c936844010466535bd46ea4ce4656ef17653644 No Types Assigned https://git.kernel.org/stable/c/9c936844010466535bd46ea4ce4656ef17653644 Patch Changed Reference Type https://git.kernel.org/stable/c/fb2d057539eda67ec7cfc369bf587e6518a9b99d No Types Assigned https://git.kernel.org/stable/c/fb2d057539eda67ec7cfc369bf587e6518a9b99d Patch Added CWE NIST CWE-835 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.13 up to (excluding) 5.15.168 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.113 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.54 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.10.13 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.11 up to (excluding) 6.11.2 -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Oct. 21, 2024
Action Type Old Value New Value Added Description 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. Added Reference kernel.org https://git.kernel.org/stable/c/40fb64257dab507d86b5f1f2a62f3669ef0c91a8 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/20c96d0aaabfe361fc2a11c173968dc67feadbbf [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/fb2d057539eda67ec7cfc369bf587e6518a9b99d [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/0f89fb4042c08fd143bfc28af08bf6c8a0197eea [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/8132510c915815e6b537ab937d94ed66893bc7b8 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/9c936844010466535bd46ea4ce4656ef17653644 [No types assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2024-49856 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2024-49856
weaknesses.