CVE-2024-49856

MEDIUM EPSS 10.6%
Published Oct 21, 20241y ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Oct 21, 2024 1y ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
10.6% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-835

Affected Products 5

VendorProductVersionRange
linuxlinux_kernel*≥5.13  –  <5.15.168
linuxlinux_kernel*≥5.16  –  <6.1.113
linuxlinux_kernel*≥6.2  –  <6.6.54
linuxlinux_kernel*≥6.7  –  <6.10.13
linuxlinux_kernel*≥6.11  –  <6.11.2

References 7

  • git.kernel.org https://git.kernel.org/stable/c/0f89fb4042c08fd143bfc28af08bf6c8a0197eea
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/20c96d0aaabfe361fc2a11c173968dc67feadbbf
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/40fb64257dab507d86b5f1f2a62f3669ef0c91a8
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8132510c915815e6b537ab937d94ed66893bc7b8
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9c936844010466535bd46ea4ce4656ef17653644
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/fb2d057539eda67ec7cfc369bf587e6518a9b99d
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/0f89fb4042c08fd143bfc28af08bf6c8a0197eea
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/20c96d0aaabfe361fc2a11c173968dc67feadbbf
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/40fb64257dab507d86b5f1f2a62f3669ef0c91a8
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8132510c915815e6b537ab937d94ed66893bc7b8
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9c936844010466535bd46ea4ce4656ef17653644
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/fb2d057539eda67ec7cfc369bf587e6518a9b99d
    Patch