In the Linux kernel, the following vulnerability has been resolved:
bpf: Fix a kernel verifier crash in stacksafe()
Daniel Hodges reported a kernel verifier crash when playing with sched-ext.
Further investigation shows that the crash is due to invalid memory access
in stacksafe(). More specifically, it is the following code:
if (exact != NOT_EXACT &&
old->stack[spi].slot_type[i % BPF_REG_SIZE] !=
cur->stack[spi].slot_type[i % BPF_REG_SIZE])
return false;
The 'i' iterates old->allocated_stack.
If cur->allocated_stack < old->allocated_stack the out-of-bound
access will happen.
To fix the issue add 'i >= cur->allocated_stack' check such that if
the condition is true, stacksafe() should fail. Otherwise,
cur->stack[spi].slot_type[i % BPF_REG_SIZE] memory access is legal.
References
Configurations
Configuration 1 (hide)
|
History
13 Sep 2024, 16:36
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://git.kernel.org/stable/c/bed2eb964c70b780fb55925892a74f26cb590b25 - Patch | |
| References | () https://git.kernel.org/stable/c/6e3987ac310c74bb4dd6a2fa8e46702fe505fb2b - Patch | |
| References | () https://git.kernel.org/stable/c/7cad3174cc79519bf5f6c4441780264416822c08 - Patch | |
| CPE | cpe:2.3:o:linux:linux_kernel:6.11:rc3:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.11:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.11:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
|
| CWE | CWE-787 | |
| First Time |
Linux
Linux linux Kernel |
|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
11 Sep 2024, 16:26
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2024-09-11 16:15
Updated : 2024-09-13 16:36
NVD link : CVE-2024-45020
Mitre link : CVE-2024-45020
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-787
Out-of-bounds Write