CVE-2025-21804: PCI: rcar-ep: Fix incorrect variable used when calling devm_request_mem_region()
In the Linux kernel, the following vulnerability has been resolved:
PCI: rcar-ep: Fix incorrect variable used when calling devmrequestmemregion()
The rcarpcieparseoutboundranges() uses the devmrequestmemregion() macro to request a needed resource. A string variable that lives on the stack is then used to store a dynamically computed resource name, which is then passed on as one of the macro arguments. This can lead to undefined behavior.
Depending on the current contents of the memory, the manifestations of errors may vary. One possible output may be as follows:
$ cat /proc/iomem 30000000-37ffffff : 38000000-3fffffff :
Sometimes, garbage may appear after the colon.
In very rare cases, if no NULL-terminator is found in memory, the system might crash because the string iterator will overrun which can lead to access of unmapped memory above the stack.
Thus, fix this by replacing outboundname with the name of the previously requested resource. With the changes applied, the output will be as follows:
$ cat /proc/iomem 30000000-37ffffff : memory2 38000000-3fffffff : memory3
[kwilczynski: commit log]
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
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ubuntu/linux-azure-6.11to a version that resolves this vulnerability.Fixed in 6.11.0-1015.15~24.04.1 - Upgrade
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ubuntu/linux-gcp-6.11to a version that resolves this vulnerability.Fixed in 6.11.0-1015.15~24.04.1 - Upgrade
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ubuntu/linux-gketo a version that resolves this vulnerability.Fixed in 6.8.0-1028.32 - Upgrade
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ubuntu/linux-gkeopto a version that resolves this vulnerability.Fixed in 6.8.0-1015.17 - Upgrade
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ubuntu/linux-hwe-6.11to a version that resolves this vulnerability.Fixed in 6.11.0-26.26~24.04.1 - Upgrade
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ubuntu/linux-ibmto a version that resolves this vulnerability.Fixed in 6.8.0-1029.29 - Upgrade
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ubuntu/linux-lowlatencyto a version that resolves this vulnerability.Fixed in 6.8.0-64.67.1 - Upgrade
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ubuntu/linux-lowlatency-hwe-6.11to a version that resolves this vulnerability.Fixed in 6.11.0-1014.15~24.04.1 - Upgrade
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ubuntu/linux-nvidiato a version that resolves this vulnerability.Fixed in 6.8.0-1031.34 - Upgrade
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ubuntu/linux-nvidia-6.11to a version that resolves this vulnerability.Fixed in 6.11.0-1010.10 - Upgrade
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ubuntu/linux-fipsto a version that resolves this vulnerability.Fixed in 6.8.0-78.78+fips1 - Compensating control
In the Linux kernel PCI rcar-ep driver, update rcar_pcie_parse_outbound_ranges() so the devm_request_mem_region() call uses the name of the previously requested resource instead of outbound_name.
Event History
Frequently Asked Questions
What is the severity of CVE-2025-21804?
The severity of CVE-2025-21804 is classified as medium.
How do I fix CVE-2025-21804?
To fix CVE-2025-21804, update to a patched version of the Linux kernel where the vulnerability has been resolved.
What components are affected by CVE-2025-21804?
CVE-2025-21804 affects the PCI component within the Linux kernel.
What versions of the Linux kernel are affected by CVE-2025-21804?
CVE-2025-21804 affects specific versions of the Linux kernel that utilize the rcar_pcie_parse_outbound_ranges() function.
Is CVE-2025-21804 exploitable in a public environment?
CVE-2025-21804 may be exploited in a public environment if the affected components are utilized improperly.