| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2024-53075: riscv: Prevent a bad reference count on CPU nodes |
| |
| Description |
| =========== |
| |
| 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. |
| |
| The Linux kernel CVE team has assigned CVE-2024-53075 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.11 with commit 604f32ea6909b0ebb8ab0bf1ab7dc66ee3dc8955 and fixed in 6.11.7 with commit 303846a3dc275e35fbb556d72f1e356ba669e4f8 |
| Issue introduced in 6.11 with commit 604f32ea6909b0ebb8ab0bf1ab7dc66ee3dc8955 and fixed in 6.12 with commit 37233169a6ea912020c572f870075a63293b786a |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2024-53075 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| arch/riscv/kernel/cacheinfo.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/80aec5a855106c668b5978c48e789f010198b832 |
| https://git.kernel.org/stable/c/303846a3dc275e35fbb556d72f1e356ba669e4f8 |
| https://git.kernel.org/stable/c/37233169a6ea912020c572f870075a63293b786a |
