| From bippy-1.2.0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@kernel.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2025-37849: KVM: arm64: Tear down vGIC on failed vCPU creation |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| KVM: arm64: Tear down vGIC on failed vCPU creation |
| |
| If kvm_arch_vcpu_create() fails to share the vCPU page with the |
| hypervisor, we propagate the error back to the ioctl but leave the |
| vGIC vCPU data initialised. Note only does this leak the corresponding |
| memory when the vCPU is destroyed but it can also lead to use-after-free |
| if the redistributor device handling tries to walk into the vCPU. |
| |
| Add the missing cleanup to kvm_arch_vcpu_create(), ensuring that the |
| vGIC vCPU structures are destroyed on error. |
| |
| The Linux kernel CVE team has assigned CVE-2025-37849 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 6.1.135 with commit 07476e0d932afc53c05468076393ac35d0b4999e |
| Fixed in 6.6.88 with commit 5085e02362b9948f82fceca979b8f8e12acb1cc5 |
| Fixed in 6.12.24 with commit c322789613407647a05ff5c451a7bf545fb34e73 |
| Fixed in 6.13.12 with commit 2480326eba8ae9ccc5e4c3c2dc8d407db68e3c52 |
| Fixed in 6.14.3 with commit f1e9087abaeedec9bf2894a282ee4f0d8383f299 |
| Fixed in 6.15 with commit 250f25367b58d8c65a1b060a2dda037eea09a672 |
| |
| 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-2025-37849 |
| 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/arm64/kvm/arm.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/07476e0d932afc53c05468076393ac35d0b4999e |
| https://git.kernel.org/stable/c/5085e02362b9948f82fceca979b8f8e12acb1cc5 |
| https://git.kernel.org/stable/c/c322789613407647a05ff5c451a7bf545fb34e73 |
| https://git.kernel.org/stable/c/2480326eba8ae9ccc5e4c3c2dc8d407db68e3c52 |
| https://git.kernel.org/stable/c/f1e9087abaeedec9bf2894a282ee4f0d8383f299 |
| https://git.kernel.org/stable/c/250f25367b58d8c65a1b060a2dda037eea09a672 |
