{"id":"CVE-2026-53325","summary":"agp/amd64: Fix broken error propagation in agp_amd64_probe()","details":"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 (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 \u003c 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 -\u003emisc 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.","modified":"2026-07-15T01:49:04.998394054Z","published":"2026-06-29T04:53:35.833Z","related":["CGA-29fp-vf8f-xg5j","openSUSE-SU-2026:11175-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53325.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0aa9b27c454c53074cde592eaceb442d30341585"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1d7d45050e14083c1de1460c93f4063c1f0bca7b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3e844a63668d1c3d10a9d347d7ebf161b2f91c84"},{"type":"WEB","url":"https://git.kernel.org/stable/c/53483a9f4ee9eeb18aa866ec16cce79e136987e1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/564b3b3f6565313eb6fa5355ffd037d6fb27897f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b08472db93b1ccff84a7adec5779d47f0e9d3a30"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ce800993af477fc24187349c6a20d3073140b759"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cefe535a60a2e00e09f4b2689b0c8ffc6912459a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/eb045714bc6a2bbb0befb7a31b996a196e188869"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53325.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53325"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"a32073bffc656ca4bde6002b6cf7c1a8e0e22712"},{"fixed":"ce800993af477fc24187349c6a20d3073140b759"},{"fixed":"1d7d45050e14083c1de1460c93f4063c1f0bca7b"},{"fixed":"3e844a63668d1c3d10a9d347d7ebf161b2f91c84"},{"fixed":"eb045714bc6a2bbb0befb7a31b996a196e188869"},{"fixed":"564b3b3f6565313eb6fa5355ffd037d6fb27897f"},{"fixed":"53483a9f4ee9eeb18aa866ec16cce79e136987e1"},{"fixed":"0aa9b27c454c53074cde592eaceb442d30341585"},{"fixed":"cefe535a60a2e00e09f4b2689b0c8ffc6912459a"},{"fixed":"b08472db93b1ccff84a7adec5779d47f0e9d3a30"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53325.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.18"},{"fixed":"5.10.260"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.211"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.177"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.144"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.95"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.37"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.14"}]},{"type":"ECOSYSTEM","events":[{"introduced":"7.1.0"},{"fixed":"7.1.2"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53325.json"}}],"schema_version":"1.7.5"}