CVE-2024-49856

CVE Details

Release Date:	2024-10-21
Impact:	Moderate	What is this?

Description

In the Linux kernel, the following vulnerability has been resolved:\nx86/sgx: Fix deadlock in SGX NUMA node search\nWhen the current node doesn't have an EPC section configured by firmware\nand all other EPC sections are used up, CPU can get stuck inside the\nwhile loop that looks for an available EPC page from remote nodes\nindefinitely, leading to a soft lockup. Note how nid_of_current will\nnever be equal to nid in that while loop because nid_of_current is not\nset in sgx_numa_mask.\nAlso worth mentioning is that it's perfectly fine for the firmware not\nto setup an EPC section on a node. While setting up an EPC section on\neach node can enhance performance, it is not a requirement for\nfunctionality.\nRework the loop to start and end on *a* node that has SGX memory. This\navoids the deadlock looking for the current SGX-lacking node to show up\nin the loop when it never will.

See more information about CVE-2024-49856 from MITRE CVE dictionary and NIST NVD

NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 metrics

Base Score:	5.5
Vector String:	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Version:	3.1
Attack Vector:	Local
Attack Complexity:	Low
Privileges Required:	Low
User Interaction:	None
Scope:	Unchanged
Confidentiality Impact:	None
Integrity Impact:	None
Availability Impact:	High

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