In the Linux kernel, the following vulnerability has been resolved:
x86/mm: Disallow vsyscall page read for copy_from_kernel_nofault()
When trying to use copy_from_kernel_nofault() to read vsyscall page
through a bpf program, the following oops was reported:
BUG: unable to handle page fault for address: ffffffffff600000
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 3231067 P4D 3231067 PUD 3233067 PMD 3235067 PTE 0
Oops: 0000 [#1] PREEMPT SMP PTI
CPU: 1 PID: 20390 Comm: test_progs ...... 6.7.0+ #58
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) ......
RIP: 0010:copy_from_kernel_nofault+0x6f/0x110
......
Call Trace:
<TASK>
? copy_from_kernel_nofault+0x6f/0x110
bpf_probe_read_kernel+0x1d/0x50
bpf_prog_2061065e56845f08_do_probe_read+0x51/0x8d
trace_call_bpf+0xc5/0x1c0
perf_call_bpf_enter.isra.0+0x69/0xb0
perf_syscall_enter+0x13e/0x200
syscall_trace_enter+0x188/0x1c0
do_syscall_64+0xb5/0xe0
entry_SYSCALL_64_after_hwframe+0x6e/0x76
</TASK>
......
---[ end trace 0000000000000000 ]---
The oops is triggered when:
1) A bpf program uses bpf_probe_read_kernel() to read from the vsyscall
page and invokes copy_from_kernel_nofault() which in turn calls
__get_user_asm().
2) Because the vsyscall page address is not readable from kernel space,
a page fault exception is triggered accordingly.
3) handle_page_fault() considers the vsyscall page address as a user
space address instead of a kernel space address. This results in the
fix-up setup by bpf not being applied and a page_fault_oops() is invoked
due to SMAP.
Considering handle_page_fault() has already considered the vsyscall page
address as a userspace address, fix the problem by disallowing vsyscall
page read for copy_from_kernel_nofault().
References
Configurations
Configuration 1 (hide)
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Configuration 2 (hide)
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History
16 Sep 2025, 16:42
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.8:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.8:rc3:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.8:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.8:rc5:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.8:rc4:*:*:*:*:*:* |
|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
| CWE | NVD-CWE-noinfo | |
| References | () https://git.kernel.org/stable/c/29bd6f86904682adafe9affbc7f79b14defcaff8 - Patch | |
| References | () https://git.kernel.org/stable/c/32019c659ecfe1d92e3bf9fcdfbb11a7c70acd58 - Patch | |
| References | () https://git.kernel.org/stable/c/57f78c46f08198e1be08ffe99c4c1ccc12855bf5 - Patch | |
| References | () https://git.kernel.org/stable/c/6e4694e65b6db4c3de125115dd4f55848cc48381 - Patch | |
| References | () https://git.kernel.org/stable/c/e8a67fe34b76a49320b33032228a794f40b0316b - Patch | |
| References | () https://git.kernel.org/stable/c/f175de546a3eb77614d94d4c02550181c0a8493e - Patch | |
| References | () https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html - Third Party Advisory | |
| First Time |
Linux linux Kernel
Debian Debian debian Linux Linux |
21 Nov 2024, 09:03
| Type | Values Removed | Values Added |
|---|---|---|
| References |
|
|
| References | () https://git.kernel.org/stable/c/29bd6f86904682adafe9affbc7f79b14defcaff8 - | |
| References | () https://git.kernel.org/stable/c/32019c659ecfe1d92e3bf9fcdfbb11a7c70acd58 - | |
| References | () https://git.kernel.org/stable/c/57f78c46f08198e1be08ffe99c4c1ccc12855bf5 - | |
| References | () https://git.kernel.org/stable/c/6e4694e65b6db4c3de125115dd4f55848cc48381 - | |
| References | () https://git.kernel.org/stable/c/e8a67fe34b76a49320b33032228a794f40b0316b - | |
| References | () https://git.kernel.org/stable/c/f175de546a3eb77614d94d4c02550181c0a8493e - |
05 Nov 2024, 10:16
| Type | Values Removed | Values Added |
|---|---|---|
| References |
|
25 Jun 2024, 22:15
| Type | Values Removed | Values Added |
|---|---|---|
| Summary |
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|
| References |
|
17 Apr 2024, 11:15
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2024-04-17 11:15
Updated : 2025-09-16 16:42
NVD link : CVE-2024-26906
Mitre link : CVE-2024-26906
CVE.ORG link : CVE-2024-26906
JSON object : View
Products Affected
debian
- debian_linux
linux
- linux_kernel
CWE