agp/amd64: Fix broken error propagation in agp_amd64_probe()
In the Linux kernel, the following vulnerability has been resolved: agp/amd64: Fix broken error propagation in agp_amd64_probe() A NULL pointer dereference was observed in the AMD64 AGP driver when running in a virtualized environment (e.g. qemu/kvm) without a physical AMD northbridge. The crash occurs in amd64_fetch_size() when attempting to dereference the pointer returned by node_to_amd_nb(0). The root cause of this crash is broken error propagation in agp_amd64_probe(): When no AMD northbridges are found, cache_nbs() correctly returns -ENODEV. However, the probe function erroneously checks the return value against exactly -1, rather than < 0. As a result, the hardware absence error is masked, allowing the driver to improperly proceed with initialization. It eventually calls agp_add_bridge(), which invokes amd64_fetch_size(). Since the hardware does not exist, node_to_amd_nb(0) returns NULL, leading to a General Protection Fault (GPF) when accessing its ->misc member. Fix the issue by correcting the error check in agp_amd64_probe() to abort properly when cache_nbs() returns any negative error code. This prevents the driver from erroneously proceeding without hardware, thereby avoiding the subsequent NULL pointer dereference at its source.
CVE-2026-53325
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-53325
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "a32073bffc656ca4bde6002b6cf7c1a8e0e22712",
"lessThan": "ce800993af477fc24187349c6a20d3073140b759",
"versionType": "git"
},
{
"status": "affected",
"version": "a32073bffc656ca4bde6002b6cf7c1a8e0e22712",
"lessThan": "1d7d45050e14083c1de1460c93f4063c1f0bca7b",
"versionType": "git"
},
{
"status": "affected",
"version": "a32073bffc656ca4bde6002b6cf7c1a8e0e22712",
"lessThan": "3e844a63668d1c3d10a9d347d7ebf161b2f91c84",
"versionType": "git"
},
{
"status": "affected",
"version": "a32073bffc656ca4bde6002b6cf7c1a8e0e22712",
"lessThan": "eb045714bc6a2bbb0befb7a31b996a196e188869",
"versionType": "git"
},
{
"status": "affected",
"version": "a32073bffc656ca4bde6002b6cf7c1a8e0e22712",
"lessThan": "564b3b3f6565313eb6fa5355ffd037d6fb27897f",
"versionType": "git"
},
{
"status": "affected",
"version": "a32073bffc656ca4bde6002b6cf7c1a8e0e22712",
"lessThan": "53483a9f4ee9eeb18aa866ec16cce79e136987e1",
"versionType": "git"
},
{
"status": "affected",
"version": "a32073bffc656ca4bde6002b6cf7c1a8e0e22712",
"lessThan": "0aa9b27c454c53074cde592eaceb442d30341585",
"versionType": "git"
},
{
"status": "affected",
"version": "a32073bffc656ca4bde6002b6cf7c1a8e0e22712",
"lessThan": "cefe535a60a2e00e09f4b2689b0c8ffc6912459a",
"versionType": "git"
},
{
"status": "affected",
"version": "a32073bffc656ca4bde6002b6cf7c1a8e0e22712",
"lessThan": "b08472db93b1ccff84a7adec5779d47f0e9d3a30",
"versionType": "git"
}
],
"programFiles": [
"drivers/char/agp/amd64-agp.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.18"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.18",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.260",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.211",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.177",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.144",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.95",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.37",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.0.14",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1.2",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/char/agp/amd64-agp.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-53325
Source reference:
/cveMetadata/cveId
Publisher severity
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- Event
- #28449 · Revision 1
- Added to Heist Feed
- Publisher date