| 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-2024-26691: KVM: arm64: Fix circular locking dependency |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| KVM: arm64: Fix circular locking dependency |
| |
| The rule inside kvm enforces that the vcpu->mutex is taken *inside* |
| kvm->lock. The rule is violated by the pkvm_create_hyp_vm() which acquires |
| the kvm->lock while already holding the vcpu->mutex lock from |
| kvm_vcpu_ioctl(). Avoid the circular locking dependency altogether by |
| protecting the hyp vm handle with the config_lock, much like we already |
| do for other forms of VM-scoped data. |
| |
| The Linux kernel CVE team has assigned CVE-2024-26691 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 6.6.18 with commit 3d16cebf01127f459dcfeb79ed77bd68b124c228 |
| Fixed in 6.7.6 with commit 3ab1c40a1e915e350d9181a4603af393141970cc |
| Fixed in 6.8 with commit 10c02aad111df02088d1a81792a709f6a7eca6cc |
| |
| 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-2024-26691 |
| 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/pkvm.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/3d16cebf01127f459dcfeb79ed77bd68b124c228 |
| https://git.kernel.org/stable/c/3ab1c40a1e915e350d9181a4603af393141970cc |
| https://git.kernel.org/stable/c/10c02aad111df02088d1a81792a709f6a7eca6cc |
