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. 21, 2024, 5:09 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
Exploitability Score :
Affected Products
The following products are affected by CVE-2024-49856
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
References to Advisories, Solutions, and Tools
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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).
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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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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.