SB20260528192 - Improper access control in Linux kernel core
Published: May 28, 2026
Security Bulletin ID
SB20260528192
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper access control (CVE-ID: CVE-2026-45886)
CWE-ID: CWE-284 - Improper Access Control
CVSSv4: 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
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.
Remediation
Install update from vendor's website.
References
- 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