| 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-2024-26617: fs/proc/task_mmu: move mmu notification mechanism inside mm lock |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| fs/proc/task_mmu: move mmu notification mechanism inside mm lock |
| |
| Move mmu notification mechanism inside mm lock to prevent race condition |
| in other components which depend on it. The notifier will invalidate |
| memory range. Depending upon the number of iterations, different memory |
| ranges would be invalidated. |
| |
| The following warning would be removed by this patch: |
| WARNING: CPU: 0 PID: 5067 at arch/x86/kvm/../../../virt/kvm/kvm_main.c:734 kvm_mmu_notifier_change_pte+0x860/0x960 arch/x86/kvm/../../../virt/kvm/kvm_main.c:734 |
| |
| There is no behavioural and performance change with this patch when |
| there is no component registered with the mmu notifier. |
| |
| [akpm@linux-foundation.org: narrow the scope of `range', per Sean] |
| |
| The Linux kernel CVE team has assigned CVE-2024-26617 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.7 with commit 52526ca7fdb905a768a93f8faa418e9b988fc34b and fixed in 6.7.3 with commit 05509adf297924f51e1493aa86f9fcde1433ed80 |
| Issue introduced in 6.7 with commit 52526ca7fdb905a768a93f8faa418e9b988fc34b and fixed in 6.8 with commit 4cccb6221cae6d020270606b9e52b1678fc8b71a |
| |
| 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-2024-26617 |
| 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: |
| fs/proc/task_mmu.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/05509adf297924f51e1493aa86f9fcde1433ed80 |
| https://git.kernel.org/stable/c/4cccb6221cae6d020270606b9e52b1678fc8b71a |
