{"id":"CVE-2026-53325","state":"PUBLISHED","title":"agp/amd64: Fix broken error propagation in agp_amd64_probe()","description":"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 < 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.","publishedAt":"2026-06-29T04:53:35.833Z","updatedAt":"2026-10-15T01:23:14.920Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"a32073bffc656ca4bde6002b6cf7c1a8e0e22712","status":"affected","lessThan":"ce800993af477fc24187349c6a20d3073140b759","versionType":"git"},{"version":"a32073bffc656ca4bde6002b6cf7c1a8e0e22712","status":"affected","lessThan":"1d7d45050e14083c1de1460c93f4063c1f0bca7b","versionType":"git"},{"version":"a32073bffc656ca4bde6002b6cf7c1a8e0e22712","status":"affected","lessThan":"3e844a63668d1c3d10a9d347d7ebf161b2f91c84","versionType":"git"},{"version":"a32073bffc656ca4bde6002b6cf7c1a8e0e22712","status":"affected","lessThan":"eb045714bc6a2bbb0befb7a31b996a196e188869","versionType":"git"},{"version":"a32073bffc656ca4bde6002b6cf7c1a8e0e22712","status":"affected","lessThan":"564b3b3f6565313eb6fa5355ffd037d6fb27897f","versionType":"git"},{"version":"a32073bffc656ca4bde6002b6cf7c1a8e0e22712","status":"affected","lessThan":"53483a9f4ee9eeb18aa866ec16cce79e136987e1","versionType":"git"},{"version":"a32073bffc656ca4bde6002b6cf7c1a8e0e22712","status":"affected","lessThan":"0aa9b27c454c53074cde592eaceb442d30341585","versionType":"git"},{"version":"a32073bffc656ca4bde6002b6cf7c1a8e0e22712","status":"affected","lessThan":"cefe535a60a2e00e09f4b2689b0c8ffc6912459a","versionType":"git"},{"version":"a32073bffc656ca4bde6002b6cf7c1a8e0e22712","status":"affected","lessThan":"b08472db93b1ccff84a7adec5779d47f0e9d3a30","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/char/agp/amd64-agp.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.18","versionType":"semver"},{"version":"5.10.260","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.211","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.177","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.144","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.95","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.37","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.14","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1.2","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/char/agp/amd64-agp.c"]}],"references":["https://git.kernel.org/stable/c/ce800993af477fc24187349c6a20d3073140b759","https://git.kernel.org/stable/c/1d7d45050e14083c1de1460c93f4063c1f0bca7b","https://git.kernel.org/stable/c/3e844a63668d1c3d10a9d347d7ebf161b2f91c84","https://git.kernel.org/stable/c/eb045714bc6a2bbb0befb7a31b996a196e188869","https://git.kernel.org/stable/c/564b3b3f6565313eb6fa5355ffd037d6fb27897f","https://git.kernel.org/stable/c/53483a9f4ee9eeb18aa866ec16cce79e136987e1","https://git.kernel.org/stable/c/0aa9b27c454c53074cde592eaceb442d30341585","https://git.kernel.org/stable/c/cefe535a60a2e00e09f4b2689b0c8ffc6912459a","https://git.kernel.org/stable/c/b08472db93b1ccff84a7adec5779d47f0e9d3a30","https://cert-portal.siemens.com/productcert/html/ssa-784472.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/53xxx/CVE-2026-53325.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53325","state":"PUBLISHED","datePublished":"2026-06-29T04:53:35.833Z","dateUpdated":"2026-10-15T01:23:14.920Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-06-09T07:44:35.398Z"},"containers":{"cna":{"title":"agp/amd64: Fix broken error propagation in agp_amd64_probe()","descriptions":[{"lang":"en","value":"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 < 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 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