In the Linux kernel, the following vulnerability has been resolved:
bpf: correctly handle malformed BPF_CORE_TYPE_ID_LOCAL relos
In case of malformed relocation record of kind BPF_CORE_TYPE_ID_LOCAL
referencing a non-existing BTF type, function bpf_core_calc_relo_insn
would cause a null pointer deference.
Fix this by adding a proper check upper in call stack, as malformed
relocation records could be passed from user space.
Simplest reproducer is a program:
r0 = 0
exit
With a single relocation record:
.insn_off = 0, /* patch first instruction */
.type_id = 100500, /* this type id does not exist */
.access_str_off = 6, /* offset of string "0" */
.kind = BPF_CORE_TYPE_ID_LOCAL,
See the link for original reproducer or next commit for a test case.
References
Configurations
Configuration 1 (hide)
|
History
22 Oct 2024, 16:12
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| References | () https://git.kernel.org/stable/c/3d2786d65aaa954ebd3fcc033ada433e10da21c4 - Patch | |
| References | () https://git.kernel.org/stable/c/e7e9c5b2dda29067332df2a85b0141a92b41f218 - Patch | |
| References | () https://git.kernel.org/stable/c/dc7ce14f00bcd50641f2110b7a32aa6552e0780f - Patch | |
| References | () https://git.kernel.org/stable/c/2288b54b96dcb55bedebcef3572bb8821fc5e708 - Patch | |
| References | () https://git.kernel.org/stable/c/584cd3ff792e1edbea20b2a7df55897159b0be3e - Patch | |
| CWE | CWE-476 | |
| First Time |
Linux
Linux linux Kernel |
|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
21 Oct 2024, 13:15
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2024-10-21 13:15
Updated : 2024-10-22 16:12
NVD link : CVE-2024-49850
Mitre link : CVE-2024-49850
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-476
NULL Pointer Dereference