SB2026062979 - Out-of-bounds read in Linux kernel iommu amd driver

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds read (CVE-ID: CVE-2026-53283)

CWE-ID: CWE-125 - Out-of-bounds read

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 attacker to cause a denial of service.

The vulnerability exists due to an out-of-bounds read in __rlookup_amd_iommu() when registering and probing PCI devices during boot. A local attacker can present a PCI device whose BDF is not described by the IVRS to cause a denial of service.

The issue can lead to a boot-time general protection fault when adjacent slab contents are dereferenced as a struct amd_iommu *.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/07d0f496fe7ec5abe3bee7e38be709521567bb33
• https://git.kernel.org/stable/c/79db4cbab81f07ce69a93d379ebd40d3709ecfb2
• https://git.kernel.org/stable/c/f0a0f01787ecece814414b0665df879b69849d09