In the Linux kernel, the following vulnerability has been resolved:
dpaa2-switch: validate num_ifs to prevent out-of-bounds write
The driver obtains sw_attr.num_ifs from firmware via dpsw_get_attributes()
but never validates it against DPSW_MAX_IF (64). This value controls
iteration in dpaa2_switch_fdb_get_flood_cfg(), which writes port indices
into the fixed-size cfg->if_id[DPSW_MAX_IF] array. When firmware reports
num_ifs >= 64, the loop can write past the array bounds.
Add a bound check for num_ifs in dpaa2_switch_init().
dpaa2_switch_fdb_get_flood_cfg() appends the control interface (port
num_ifs) after all matched ports. When num_ifs == DPSW_MAX_IF and all
ports match the flood filter, the loop fills all 64 slots and the control
interface write overflows by one entry.
The check uses >= because num_ifs == DPSW_MAX_IF is also functionally
broken.
build_if_id_bitmap() silently drops any ID >= 64:
if (id[i] < DPSW_MAX_IF)
bmap[id[i] / 64] |= ...
References
Configurations
Configuration 1 (hide)
|
History
11 May 2026, 19:59
| Type | Values Removed | Values Added |
|---|---|---|
| First Time |
Linux linux Kernel
Linux |
|
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* |
|
| References | () https://git.kernel.org/stable/c/89764cf44544e943230f5e03b8c40a90da26537c - Patch | |
| References | () https://git.kernel.org/stable/c/8a5752c6dcc085a3bfc78589925182e4e98468c5 - Patch | |
| References | () https://git.kernel.org/stable/c/8b841fd529db9faf8bc678d429d4bf4e98b10900 - Patch | |
| References | () https://git.kernel.org/stable/c/a26dda3bae469c8e4e1b1993ad33dafa32d0fc28 - Patch | |
| References | () https://git.kernel.org/stable/c/a3034a8d56174dd6464c46823438f25797910a8d - Patch | |
| References | () https://git.kernel.org/stable/c/b690635d4719214892855b79ce018d4b1672ac96 - Patch | |
| References | () https://git.kernel.org/stable/c/c18493f750208eb4ff1198fc5a02786b8b2d70a6 - Patch | |
| CWE | CWE-787 | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 7.8 |
06 May 2026, 12:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-05-06 12:16
Updated : 2026-05-11 19:59
NVD link : CVE-2026-43205
Mitre link : CVE-2026-43205
CVE.ORG link : CVE-2026-43205
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-787
Out-of-bounds Write