CVE-2026-53325
agp/amd64: Fix broken error propagation in agp_amd64_probe()
At a glance
- Source
- NVD
- EPSS
- EPSS 0.13 % · percentile 3 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- Linux
- NVD status
- Modified
Description
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.
Weaknesses (CWE)
- CWE-476 — NULL Pointer Dereference
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
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | MEDIUM 5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H | NVD · nvd@nist.gov (Primary) |
European references
- ENISA EUVD · EUVD-2026-40034
- GCVE · GCVE-0-2026-53325
CERT-FR advisories
- CERTFR-2026-AVI-1385 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1333 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1298 — Multiples vulnérabilités dans les produits Siemens · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1286 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1252 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1229 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1203 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1162 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1064 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1029 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0982 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0957 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0929 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0927 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0862 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0855 — Multiples vulnérabilités dans Microsoft Azure Linux · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 2.6.18 < 5.10.260cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.11 < 5.15.211cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.16 < 6.1.177cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.2 < 6.6.144cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.7 < 6.12.95cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.13 < 6.18.37cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.19 < 7.0.14cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 7.1 < 7.1.2
Affected products
| Product | Versions |
|---|---|
| Linux · Linux | affected a32073bffc656ca4bde6002b6cf7c1a8e0e22712 < ce800993af477fc24187349c6a20d3073140b759 ; affected a32073bffc656ca4bde6002b6cf7c1a8e0e22712 < 1d7d45050e14083c1de1460c93f4063c1f0bca7b ; affected a32073bffc656ca4bde6002b6cf7c1a8e0e22712 < 3e844a63668d1c3d10a9d347d7ebf161b2f91c84 ; affected a32073bffc656ca4bde6002b6cf7c1a8e0e22712 < eb045714bc6a2bbb0befb7a31b996a196e188869 ; affected a32073bffc656ca4bde6002b6cf7c1a8e0e22712 < 564b3b3f6565313eb6fa5355ffd037d6fb27897f ; affected a32073bffc656ca4bde6002b6cf7c1a8e0e22712 < 53483a9f4ee9eeb18aa866ec16cce79e136987e1 |
| Linux · Linux | affected 2.6.18 ; unaffected 0 < 2.6.18 ; unaffected 5.10.260 ≤ 5.10.* ; unaffected 5.15.211 ≤ 5.15.* ; unaffected 6.1.177 ≤ 6.1.* ; unaffected 6.6.144 ≤ 6.6.* |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |