| 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-2021-47407: KVM: x86: Handle SRCU initialization failure during page track init |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| KVM: x86: Handle SRCU initialization failure during page track init |
| |
| Check the return of init_srcu_struct(), which can fail due to OOM, when |
| initializing the page track mechanism. Lack of checking leads to a NULL |
| pointer deref found by a modified syzkaller. |
| |
| [Move the call towards the beginning of kvm_arch_init_vm. - Paolo] |
| |
| The Linux kernel CVE team has assigned CVE-2021-47407 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 5.10.71 with commit deb2949417677649e2413266d7ce8c2ff73952b4 |
| Fixed in 5.14.10 with commit 4664318f73e496cd22c71b10888e75434a123e23 |
| Fixed in 5.15 with commit eb7511bf9182292ef1df1082d23039e856d1ddfb |
| |
| 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-2021-47407 |
| 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/x86/include/asm/kvm_page_track.h |
| arch/x86/kvm/mmu/page_track.c |
| arch/x86/kvm/x86.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/deb2949417677649e2413266d7ce8c2ff73952b4 |
| https://git.kernel.org/stable/c/4664318f73e496cd22c71b10888e75434a123e23 |
| https://git.kernel.org/stable/c/eb7511bf9182292ef1df1082d23039e856d1ddfb |
