Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected a32073bffc656ca4bde6002b6cf7c1a8e0e22712 before ce800993af477fc24187349c6a20d3073140b759; affected a32073bffc656ca4bde6002b6cf7c1a8e0e22712 before 1d7d45050e14083c1de1460c93f4063c1f0bca7b; affected a32073bffc656ca4bde6002b6cf7c1a8e0e22712 before 3e844a63668d1c3d10a9d347d7ebf161b2f91c84; affected a32073bffc656ca4bde6002b6cf7c1a8e0e22712 before eb045714bc6a2bbb0befb7a31b996a196e188869; affected a32073bffc656ca4bde6002b6cf7c1a8e0e22712 before 564b3b3f6565313eb6fa5355ffd037d6fb27897f; affected a32073bffc656ca4bde6002b6cf7c1a8e0e22712 before 53483a9f4ee9eeb18aa866ec16cce79e136987e1; affected a32073bffc656ca4bde6002b6cf7c1a8e0e22712 before 0aa9b27c454c53074cde592eaceb442d30341585; affected a32073bffc656ca4bde6002b6cf7c1a8e0e22712 before cefe535a60a2e00e09f4b2689b0c8ffc6912459a; affected a32073bffc656ca4bde6002b6cf7c1a8e0e22712 before b08472db93b1ccff84a7adec5779d47f0e9d3a30 |
| Linux / Linux | affected 2.6.18; unaffected 0 before 2.6.18; unaffected 5.10.260 through 5.10.*; unaffected 5.15.211 through 5.15.*; unaffected 6.1.177 through 6.1.*; unaffected 6.6.144 through 6.6.*; unaffected 6.12.95 through 6.12.*; unaffected 6.18.37 through 6.18.*; unaffected 7.0.14 through 7.0.*; unaffected 7.1.2 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
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
ADP enrichment
No English description supplied.