{"id":"CVE-2026-53325","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nagp/amd64: Fix broken error propagation in agp_amd64_probe()\n\nA NULL pointer dereference was observed in the AMD64 AGP driver when\nrunning in a virtualized environment …","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nagp/amd64: Fix broken error propagation in agp_amd64_probe()\n\nA NULL pointer dereference was observed in the AMD64 AGP driver when\nrunning in a virtualized environment …","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-476"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 2.6.18, < 5.10.260","linux_kernel >= 5.11, < 5.15.211","linux_kernel >= 5.16, < 6.1.177","linux_kernel >= 6.2, < 6.6.144","linux_kernel >= 6.7, < 6.12.95","linux_kernel >= 6.13, < 6.18.37","linux_kernel >= 6.19, < 7.0.14","linux_kernel >= 7.1, < 7.1.2"],"patched":["linux_kernel 7.1.2"],"published":"2026-06-29","updated":"2026-10-15","sourceUpdated":"2026-10-15T02:20:09.060","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-53325","references":[{"url":"https://git.kernel.org/stable/c/0aa9b27c454c53074cde592eaceb442d30341585","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/1d7d45050e14083c1de1460c93f4063c1f0bca7b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/3e844a63668d1c3d10a9d347d7ebf161b2f91c84","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/53483a9f4ee9eeb18aa866ec16cce79e136987e1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/564b3b3f6565313eb6fa5355ffd037d6fb27897f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b08472db93b1ccff84a7adec5779d47f0e9d3a30","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ce800993af477fc24187349c6a20d3073140b759","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/cefe535a60a2e00e09f4b2689b0c8ffc6912459a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/eb045714bc6a2bbb0befb7a31b996a196e188869","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-784472.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd","cve.org"],"epss":0.0013,"epssPercentile":0.02586,"ingestedAt":"2026-06-29T13:42:12.354Z","slug":"CVE-2026-53325","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nagp/amd64: Fix broken error propagation in agp_amd64_probe()\n\nA NULL pointer dereference was observed in the AMD64 AGP driver when\nrunning in a virtualized environment (e.g. qemu/kvm) without a physical\nAMD northbridge. The crash occurs in amd64_fetch_size() when attempting\nto dereference the pointer returned by node_to_amd_nb(0).\n\nThe root cause of this crash is broken error propagation in\nagp_amd64_probe(): When no AMD northbridges are found, cache_nbs()\ncorrectly returns -ENODEV. However, the probe function erroneously\nchecks the return value against exactly -1, rather than < 0.\n\nAs a result, the hardware absence error is masked, allowing the driver\nto improperly proceed with initialization. It eventually calls\nagp_add_bridge(), which invokes amd64_fetch_size(). Since the hardware\ndoes not exist, node_to_amd_nb(0) returns NULL, leading to a General\nProtection Fault (GPF) when accessing its ->misc member.\n\nFix the issue by correcting the error check in agp_amd64_probe() to\nabort properly when cache_nbs() returns any negative error code. This\nprevents the driver from erroneously proceeding without hardware, thereby\navoiding the subsequent NULL pointer dereference at its source.\n\n## Affected\n\n- `linux_kernel >= 2.6.18, < 5.10.260`\n- `linux_kernel >= 5.11, < 5.15.211`\n- `linux_kernel >= 5.16, < 6.1.177`\n- `linux_kernel >= 6.2, < 6.6.144`\n- `linux_kernel >= 6.7, < 6.12.95`\n- `linux_kernel >= 6.13, < 6.18.37`\n- `linux_kernel >= 6.19, < 7.0.14`\n- `linux_kernel >= 7.1, < 7.1.2`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 7.1.2`","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":221773,"id":"CVE-2026-53325","ts":1792035422364,"field":"cvss","old":null,"new":"5.5"},{"seq":221772,"id":"CVE-2026-53325","ts":1792035422364,"field":"severity","old":"none","new":"medium"}]}