SB20260928204 - Out-of-bounds write in Linux kernel vdpa vdpa_sim driver

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds write (CVE-ID: CVE-2026-97991)

CWE-ID: CWE-787 - Out-of-bounds write

CVSSv4: 7.3 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to read from and write to out-of-bounds memory.

The vulnerability exists due to improper range validation in vdpasim_blk_check_range() when processing virtio block requests with an out-of-range sector start. A local user can submit a crafted virtio block request to read from and write to out-of-bounds memory.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0a8693f00c408d85f086ad85d29e7030bf1e2055
• https://git.kernel.org/stable/c/14acb0d44b7d90a077beb7b92b444b90bafda9d9
• https://git.kernel.org/stable/c/a8a1413a2cfdbedc896249f461d6d92efbbfe21f
• https://git.kernel.org/stable/c/d6dac17e20fd2abd0eb8c09d69fccf7426e12bcf