SB20260529193 - Always-Incorrect Control Flow Implementation in Linux kernel block

Description

This security bulletin contains information about 1 vulnerability.

1) Always-Incorrect Control Flow Implementation (CVE-ID: CVE-2026-46115)

CWE-ID: CWE-670 - Always-Incorrect Control Flow Implementation

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 handling of dev_pagemap boundaries in biovec_phys_mergeable() when coalescing physically contiguous bvec segments. A local user can trigger merging of segments from different dev_pagemaps to cause a denial of service.

The issue occurs when a bio contains bvecs from different dev_pagemaps that are physically contiguous.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/13920e4b7b784b40cf4519ff1f0f3e513476a499
• https://git.kernel.org/stable/c/3d2ecbd444b01d6500671d1a582b7393943cf539
• https://git.kernel.org/stable/c/a7f3aa8c9df3905fe820ae36b67ba56b81587574
• https://git.kernel.org/stable/c/f17d521075325b8afc42d1baa1c28a5e9aca111f
• https://git.kernel.org/stable/c/f632dab4b841554cd6416058c61886d7db176581