CVE-2026-53325agp/amd64: Fix broken error propagation in agp_amd64_probe()
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from a32073bffc656ca4bde6002b6cf7c1a8e0e22712 before ce800993af477fc24187349c6a20d3073140b759; from a32073bffc656ca4bde6002b6cf7c1a8e0e22712 before 1d7d45050e14083c1de1460c93f4063c1f0bca7b; from a32073bffc656ca4bde6002b6cf7c1a8e0e22712 before 3e844a63668d1c3d10a9d347d7ebf161b2f91c84; from a32073bffc656ca4bde6002b6cf7c1a8e0e22712 before eb045714bc6a2bbb0befb7a31b996a196e188869; from a32073bffc656ca4bde6002b6cf7c1a8e0e22712 before 564b3b3f6565313eb6fa5355ffd037d6fb27897f; from a32073bffc656ca4bde6002b6cf7c1a8e0e22712 before 53483a9f4ee9eeb18aa866ec16cce79e136987e1; from a32073bffc656ca4bde6002b6cf7c1a8e0e22712 before 0aa9b27c454c53074cde592eaceb442d30341585; from a32073bffc656ca4bde6002b6cf7c1a8e0e22712 before cefe535a60a2e00e09f4b2689b0c8ffc6912459a; and 1 more ranges | CNA record |
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | all versions | CISA ADP |
linux linux_kernel linux:linux_kernel | from 2.6.18 before 5.10.260; from 5.11 before 5.15.211; from 5.16 before 6.1.177; from 6.2 before 6.6.144; from 6.7 before 6.12.95; from 6.13 before 6.18.37; from 6.19 before 7.0.14; from 7.1 before 7.1.2 | NVD |
References
- https://git.kernel.org/stable/c/ce800993af477fc24187349c6a20d3073140b759patch
- https://git.kernel.org/stable/c/1d7d45050e14083c1de1460c93f4063c1f0bca7bpatch
- https://git.kernel.org/stable/c/3e844a63668d1c3d10a9d347d7ebf161b2f91c84patch
- https://git.kernel.org/stable/c/eb045714bc6a2bbb0befb7a31b996a196e188869patch
- https://git.kernel.org/stable/c/564b3b3f6565313eb6fa5355ffd037d6fb27897fpatch
- https://git.kernel.org/stable/c/53483a9f4ee9eeb18aa866ec16cce79e136987e1patch
- https://git.kernel.org/stable/c/0aa9b27c454c53074cde592eaceb442d30341585patch
- https://git.kernel.org/stable/c/cefe535a60a2e00e09f4b2689b0c8ffc6912459apatch
- https://git.kernel.org/stable/c/b08472db93b1ccff84a7adec5779d47f0e9d3a30patch
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.