Improper input validation in Linux kernel - CVE-2026-43093
Published: May 7, 2026
Vulnerability identifier: #VU130670
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-2026-43093
CWE-ID: CWE-20
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 improper input validation in xdp_umem_reg() when registering UMEM with insufficient headroom and tailroom. A local user can supply a crafted UMEM configuration to cause a denial of service.
The issue can leave insufficient space for a minimum-sized ethernet frame and may corrupt skb_shared_info stored at the end of an XSK frame when multi-buffer operation is involved.
How to mitigate CVE-2026-43093
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/0ec4d3f6e6934deb843b561ae048cd17218e5ad1
- https://git.kernel.org/stable/c/6523bc1b40e69301f24c14338b762af4739d6d39
- https://git.kernel.org/stable/c/9ea6ba4f3195dcba6e8b3e7b2e748593b7cafb12
- https://git.kernel.org/stable/c/a03975beb9f6af0d8ac051e30b2abeabe618414f
- https://git.kernel.org/stable/c/a315e022a72d95ef5f1d4e58e903cb492b0ad931