🛡️ AZL-50709 — kernel

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

CVE-2024-49856 affecting package kernel for versions less than 5.15.173.1-1

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.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Affected software

AZL-50709 is recorded against 1 package.

  • kernel (fixed in 5.15.173.1-1)

Timeline and source

Published on 21 October 2024 and last revised on 21 April 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

nvd.nist.gov (Web)

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2024-10-21
Updated 2026-08-12
Modified 2026-04-21
Fix URL N/A

Affected Packages

Software From version Fixed in
kernel — 5.15.173.1-1

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