CVE-2026-53325agp/amd64: Fix broken error propagation in agp_amd64_probe()
- 5.5MediumCVSS base score
- 0.13%Exploitation in 30 daysEPSS · top 97% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 20 days later
· 20 days later
Published
- 4 months later
· 4 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.13% · top 97% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected a32073bffc656ca4bde6002b6cf7c1a8e0e22712 – < ce800993af477fc24187349c6a20d3073140b759
- affected a32073bffc656ca4bde6002b6cf7c1a8e0e22712 – < 1d7d45050e14083c1de1460c93f4063c1f0bca7b
- affected a32073bffc656ca4bde6002b6cf7c1a8e0e22712 – < 3e844a63668d1c3d10a9d347d7ebf161b2f91c84
- affected a32073bffc656ca4bde6002b6cf7c1a8e0e22712 – < eb045714bc6a2bbb0befb7a31b996a196e188869
- affected a32073bffc656ca4bde6002b6cf7c1a8e0e22712 – < 564b3b3f6565313eb6fa5355ffd037d6fb27897f
- affected a32073bffc656ca4bde6002b6cf7c1a8e0e22712 – < 53483a9f4ee9eeb18aa866ec16cce79e136987e1
- affected a32073bffc656ca4bde6002b6cf7c1a8e0e22712 – < 0aa9b27c454c53074cde592eaceb442d30341585
- affected a32073bffc656ca4bde6002b6cf7c1a8e0e22712 – < cefe535a60a2e00e09f4b2689b0c8ffc6912459a
- affected a32073bffc656ca4bde6002b6cf7c1a8e0e22712 – < b08472db93b1ccff84a7adec5779d47f0e9d3a30
- affected 2.6.18
- unaffected < 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.*
- unaffected 6.12.95 – ≤ 6.12.*
- unaffected 6.18.37 – ≤ 6.18.*
- unaffected 7.0.14 – ≤ 7.0.*
- unaffected 7.1.2 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References10
- https://git.kernel.org/stable/c/ce800993af477fc24187349c6a20d3073140b759 (opens in a new tab)
- https://git.kernel.org/stable/c/1d7d45050e14083c1de1460c93f4063c1f0bca7b (opens in a new tab)
- https://git.kernel.org/stable/c/3e844a63668d1c3d10a9d347d7ebf161b2f91c84 (opens in a new tab)
- https://git.kernel.org/stable/c/eb045714bc6a2bbb0befb7a31b996a196e188869 (opens in a new tab)
- https://git.kernel.org/stable/c/564b3b3f6565313eb6fa5355ffd037d6fb27897f (opens in a new tab)
- https://git.kernel.org/stable/c/53483a9f4ee9eeb18aa866ec16cce79e136987e1 (opens in a new tab)
- https://git.kernel.org/stable/c/0aa9b27c454c53074cde592eaceb442d30341585 (opens in a new tab)
- https://git.kernel.org/stable/c/cefe535a60a2e00e09f4b2689b0c8ffc6912459a (opens in a new tab)
- https://git.kernel.org/stable/c/b08472db93b1ccff84a7adec5779d47f0e9d3a30 (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-40034 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-53325)Record last updated .