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CVE-2026-53325 is a NULL pointer dereference in the Linux kernel's AMD64 AGP driver caused by incorrect error propagation in agp_amd64_probe(). When no AMD northbridge is present, cache_nbs() returns -ENODEV, but the probe function checks only for a return value of -1 instead of any negative value. Initialization consequently continues through agp_add_bridge() to amd64_fetch_size(), which accesses the misc member of a NULL pointer returned by node_to_amd_nb(0). This causes a General Protection Fault and can crash the kernel. The failure was observed in virtualized environments, including QEMU/KVM, without a physical AMD northbridge.
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A Linux kernel AMD64 AGP driver vulnerability that can cause a crash and local denial of service. The probe function incorrectly checks whether cache_nbs() returns exactly -1 instead of any negative error code, masking -ENODEV when AMD northbridge hardware is absent. Initialization then proceeds and dereferences a NULL pointer in amd64_fetch_size(). The reference assigns a CVSS v3 score of 5.5 and recommends updating the linux package and related packages to version 6.1.177-1 or later.
A locally exploitable Ubuntu vulnerability requiring low privileges and no user interaction, with high availability impact and no stated confidentiality or integrity impact. The content indicates exploit availability and CISA Known Exploited Vulnerability status.
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