| 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-2024-46707: KVM: arm64: Make ICC_*SGI*_EL1 undef in the absence of a vGICv3 |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| KVM: arm64: Make ICC_*SGI*_EL1 undef in the absence of a vGICv3 |
| |
| On a system with a GICv3, if a guest hasn't been configured with |
| GICv3 and that the host is not capable of GICv2 emulation, |
| a write to any of the ICC_*SGI*_EL1 registers is trapped to EL2. |
| |
| We therefore try to emulate the SGI access, only to hit a NULL |
| pointer as no private interrupt is allocated (no GIC, remember?). |
| |
| The obvious fix is to give the guest what it deserves, in the |
| shape of a UNDEF exception. |
| |
| The Linux kernel CVE team has assigned CVE-2024-46707 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 5.10.225 with commit 15818af2f7aa55eff375333cb7689df15d3f24ef |
| Fixed in 5.15.166 with commit 96b076e8ee5bc3a1126848c8add0f74bd30dc9d1 |
| Fixed in 6.1.107 with commit 94d4fbad01b19ec5eab3d6b50aaec4f9db8b2d8d |
| Fixed in 6.6.48 with commit 9d7629bec5c3f80bd0e3bf8103c06a2f7046bd92 |
| Fixed in 6.10.7 with commit 2073132f6ed3079369e857a8deb33d11bdd983bc |
| Fixed in 6.11 with commit 3e6245ebe7ef341639e9a7e402b3ade8ad45a19f |
| |
| 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-2024-46707 |
| 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/sys_regs.c |
| arch/arm64/kvm/vgic/vgic.h |
| |
| |
| 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/15818af2f7aa55eff375333cb7689df15d3f24ef |
| https://git.kernel.org/stable/c/96b076e8ee5bc3a1126848c8add0f74bd30dc9d1 |
| https://git.kernel.org/stable/c/94d4fbad01b19ec5eab3d6b50aaec4f9db8b2d8d |
| https://git.kernel.org/stable/c/9d7629bec5c3f80bd0e3bf8103c06a2f7046bd92 |
| https://git.kernel.org/stable/c/2073132f6ed3079369e857a8deb33d11bdd983bc |
| https://git.kernel.org/stable/c/3e6245ebe7ef341639e9a7e402b3ade8ad45a19f |
