Improper access control in Linux kernel - CVE-2026-45886
Published: May 28, 2026
Vulnerability identifier: #VU132604
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-2026-45886
CWE-ID: CWE-284
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 access control in the bpf_xdp_store_bytes helper prototype when verifying BPF programs that use read-only map values. A local user can load a crafted BPF program to cause a denial of service.
The issue is triggered when the third helper argument points to a value from a BPF_F_RDONLY_PROG map.
How to mitigate CVE-2026-45886
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/0db169a91381a473b7974021d1c02f8da72c5775
- https://git.kernel.org/stable/c/57f7f6a0ad04a65c8a7a067b2f56cbbf2aec9e52
- https://git.kernel.org/stable/c/6557f1565d779851c4db9c488c49c05a47a6e72f
- https://git.kernel.org/stable/c/d7b87adeb0eb539b9b824b101bb14fb01e41240b
- https://git.kernel.org/stable/c/ddc34a1b85505c919026ddc82fafdada9a160b15
- https://git.kernel.org/stable/c/ffb5d1c5e3933b947fc7303ad68bf0c536d0c85e