Out-of-bounds write in Linux kernel - CVE-2026-43205
Published: May 7, 2026
Vulnerability identifier: #VU130534
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-43205
CWE-ID: CWE-787
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to an out-of-bounds write in dpaa2_switch_fdb_get_flood_cfg() when processing firmware-reported switch interface attributes. A local user can provide a crafted firmware-reported num_ifs value to cause a denial of service.
The issue can also occur when num_ifs equals the maximum interface count and all ports match the flood filter, causing the control interface entry to overflow the fixed-size array by one slot.
How to mitigate CVE-2026-43205
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/89764cf44544e943230f5e03b8c40a90da26537c
- https://git.kernel.org/stable/c/8a5752c6dcc085a3bfc78589925182e4e98468c5
- https://git.kernel.org/stable/c/8b841fd529db9faf8bc678d429d4bf4e98b10900
- https://git.kernel.org/stable/c/a26dda3bae469c8e4e1b1993ad33dafa32d0fc28
- https://git.kernel.org/stable/c/a3034a8d56174dd6464c46823438f25797910a8d
- https://git.kernel.org/stable/c/b690635d4719214892855b79ce018d4b1672ac96
- https://git.kernel.org/stable/c/c18493f750208eb4ff1198fc5a02786b8b2d70a6