UBUNTU-CVE-2024-53075
In the Linux kernel, the following vulnerability has been resolved: riscv: Prevent a bad reference count on CPU nodes When populating cache leaves we previously fetched the CPU device node at the very beginning. But when ACPI is enabled we go through a specific branch which returns early and does not call 'of_node_put' for the node that was acquired. Since we are not using a CPU device node for the ACPI code anyways, we can simply move the initialization of it just passed the ACPI block, and we are guaranteed to have an 'of_node_put' call for the acquired node. This prevents a bad reference count of the CPU device node. Moreover, the previous function did not check for errors when acquiring the device node, so a return -ENOENT has been added for that case.
02 / AFFECTED SOFTWARE
Affected packages
29 explicit affected versions
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26 explicit affected versions
23 explicit affected versions
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26 explicit affected versions
12 explicit affected versions
44 explicit affected versions
4 explicit affected versions
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13 explicit affected versions
7 explicit affected versions
10 explicit affected versions
14 explicit affected versions
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3 explicit affected versions
16 explicit affected versions
43 explicit affected versions
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12 explicit affected versions
13 explicit affected versions
6 explicit affected versions
12 explicit affected versions
50 explicit affected versions
11 explicit affected versions
12 explicit affected versions
27 explicit affected versions
12 explicit affected versions
7 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
In the Linux kernel, the following vulnerability has been resolved: riscv: Prevent a bad reference count on CPU nodes When populating cache leaves we previously fetched the CPU device node at the very beginning. But when ACPI is enabled we go through a specific branch which returns early and does not call 'of_node_put' for the node that was acquired. Since we are not using a CPU device node for the ACPI code anyways, we can simply move the initialization of it just passed the ACPI block, and we are guaranteed to have an 'of_node_put' call for the acquired node. This prevents a bad reference count of the CPU device node. Moreover, the previous function did not check for errors when acquiring the device node, so a return -ENOENT has been added for that case.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/37233169a6ea912020c572f870075a63293b786a
- https://git.kernel.org/stable/c/303846a3dc275e35fbb556d72f1e356ba669e4f8
- https://git.kernel.org/stable/c/37233169a6ea912020c572f870075a63293b786a
- https://ubuntu.com/security/CVE-2024-53075
- https://ubuntu.com/security/notices/USN-7276-1
- https://ubuntu.com/security/notices/USN-7277-1
- https://ubuntu.com/security/notices/USN-7310-1
- https://www.cve.org/CVERecord?id=CVE-2024-53075