CVE-2024-56678

Published: Dic 28, 2024 Last Modified: Nov 03, 2025 EU-VD ID: EUVD-2024-53326
ExploitDB:
Other exploit source:
Google Dorks:
HIGH 7,8
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Attack Vector: local
Attack Complexity: low
Privileges Required: low
User Interaction: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high

Description

AI Translation Available

In the Linux kernel, the following vulnerability has been resolved:

powerpc/mm/fault: Fix kfence page fault reporting

copy_from_kernel_nofault() can be called when doing read of /proc/kcore.
/proc/kcore can have some unmapped kfence objects which when read via
copy_from_kernel_nofault() can cause page faults. Since *_nofault()
functions define their own fixup table for handling fault, use that
instead of asking kfence to handle such faults.

Hence we search the exception tables for the nip which generated the
fault. If there is an entry then we let the fixup table handler handle the
page fault by returning an error from within ___do_page_fault().

This can be easily triggered if someone tries to do dd from /proc/kcore.
eg. dd if=/proc/kcore of=/dev/null bs=1M

Some example false negatives:

===============================
BUG: KFENCE: invalid read in copy_from_kernel_nofault+0x9c/0x1a0
Invalid read at 0xc0000000fdff0000:
copy_from_kernel_nofault+0x9c/0x1a0
0xc00000000665f950
read_kcore_iter+0x57c/0xa04
proc_reg_read_iter+0xe4/0x16c
vfs_read+0x320/0x3ec
ksys_read+0x90/0x154
system_call_exception+0x120/0x310
system_call_vectored_common+0x15c/0x2ec

BUG: KFENCE: use-after-free read in copy_from_kernel_nofault+0x9c/0x1a0
Use-after-free read at 0xc0000000fe050000 (in kfence-#2):
copy_from_kernel_nofault+0x9c/0x1a0
0xc00000000665f950
read_kcore_iter+0x57c/0xa04
proc_reg_read_iter+0xe4/0x16c
vfs_read+0x320/0x3ec
ksys_read+0x90/0x154
system_call_exception+0x120/0x310
system_call_vectored_common+0x15c/0x2ec

EPSS (Exploit Prediction Scoring System)

Trend Analysis

EPSS (Exploit Prediction Scoring System)

Prevede la probabilità di sfruttamento basata su intelligence sulle minacce e sulle caratteristiche della vulnerabilità.

EPSS Score
0,0004
Percentile
0,1th
Updated

EPSS Score Trend (Last 90 Days)

416

Use After Free

Stable
Abstraction: Variant Structure: Simple
Common Consequences
Security Scopes Affected:
Integrity Availability Confidentiality
Potential Impacts:
Modify Memory Dos: Crash, Exit, Or Restart Execute Unauthorized Code Or Commands
Applicable Platforms
Languages: C, C++, Memory-Unsafe
Likelihood of Exploit: High
View CWE Details
Operating System

Linux Kernel by Linux

Product Information
Vendor Linux
Product Linux Kernel
Version Range Affected
From 5.16 (inclusive)
To 6.1.120 (exclusive)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Operating System

Linux Kernel by Linux

Product Information
Vendor Linux
Product Linux Kernel
Version Range Affected
From 6.7 (inclusive)
To 6.11.11 (exclusive)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Operating System

Linux Kernel by Linux

Product Information
Vendor Linux
Product Linux Kernel
Version Range Affected
From 5.13 (inclusive)
To 5.15.174 (exclusive)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Operating System

Linux Kernel by Linux

Product Information
Vendor Linux
Product Linux Kernel
Version Range Affected
From 6.2 (inclusive)
To 6.6.64 (exclusive)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Operating System

Linux Kernel by Linux

Product Information
Vendor Linux
Product Linux Kernel
Version Range Affected
From 6.12 (inclusive)
To 6.12.2 (exclusive)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
https://git.kernel.org/stable/c/06dbbb4d5f7126b6307ab807cbf…
https://git.kernel.org/stable/c/06dbbb4d5f7126b6307ab807cbf04ecfc459b933
https://git.kernel.org/stable/c/15f78d2c3d1452645bd8b9da909…
https://git.kernel.org/stable/c/15f78d2c3d1452645bd8b9da909b0ca266f83c43
https://git.kernel.org/stable/c/4d2655754e94741b159aa807b72…
https://git.kernel.org/stable/c/4d2655754e94741b159aa807b72ea85518a65fd5
https://git.kernel.org/stable/c/7eaeb7a49b6d16640f9f3c9074c…
https://git.kernel.org/stable/c/7eaeb7a49b6d16640f9f3c9074c05175d74c710b
https://git.kernel.org/stable/c/9ea8d8bf9b625e8ad3be6b0432a…
https://git.kernel.org/stable/c/9ea8d8bf9b625e8ad3be6b0432aecdc549914121
https://git.kernel.org/stable/c/e0a470b5733c1fe068d5c58b0bb…
https://git.kernel.org/stable/c/e0a470b5733c1fe068d5c58b0bb91ad539604bc6
https://lists.debian.org/debian-lts-announce/2025/03/msg000…
https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html