CVE-2026-53325: Linux kernel · agp/amd64: Fix broken error propagation in agp_amd64_probe()
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in eb045714bc6a2bbb0befb7a31b996a196e188869 : update Linux kernel when convenient.
Data as of 6 Nov 2026, 16:49 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
Thin evidence
One scorer or none- CISA SSVC
- Exploitation
- No evidence of active exploitation and no public proof of concept
- Automatable
- Attackers cannot reliably automate steps 1–4 of the kill chain
- Technical impact
- Limited control over the software or limited information exposure
CISA SSVC assessment, 2026-11-06.
- Patch
- Available – fixed in eb045714bc6a2bbb0befb7a31b996a196e188869, cefe535a60a2e00e09f4b2689b0c8ffc6912459a, ce800993af477fc24187349c6a20d3073140b759 +6
Exploitation evidence
Disclosed: evidence found.
CVE published 29 Jun 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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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.
References
- git.kernel.org/stable/c/ce800993af477fc24187349c6a20d3073140b759 (opens in a new tab)
- git.kernel.org/stable/c/1d7d45050e14083c1de1460c93f4063c1f0bca7b (opens in a new tab)
- git.kernel.org/stable/c/3e844a63668d1c3d10a9d347d7ebf161b2f91c84 (opens in a new tab)
- git.kernel.org/stable/c/eb045714bc6a2bbb0befb7a31b996a196e188869 (opens in a new tab)
- git.kernel.org/stable/c/564b3b3f6565313eb6fa5355ffd037d6fb27897f (opens in a new tab)
- git.kernel.org/stable/c/53483a9f4ee9eeb18aa866ec16cce79e136987e1 (opens in a new tab)
- git.kernel.org/stable/c/0aa9b27c454c53074cde592eaceb442d30341585 (opens in a new tab)
- git.kernel.org/stable/c/cefe535a60a2e00e09f4b2689b0c8ffc6912459a (opens in a new tab)
- git.kernel.org/stable/c/b08472db93b1ccff84a7adec5779d47f0e9d3a30 (opens in a new tab)
- cert-portal.siemens.com/productcert/html/ssa-784472.html (opens in a new tab)