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Message-ID: <20240229155245.1571576-49-lee@kernel.org> Date: Thu, 29 Feb 2024 15:53:08 +0000 From: Lee Jones <lee@...nel.org> To: linux-cve-announce@...r.kernel.org Cc: Lee Jones <lee@...nel.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@...ux-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 52526ca7fdb9 and fixed in 6.7.3 with commit 05509adf2979 Issue introduced in 6.7 with commit 52526ca7fdb9 and fixed in 6.8-rc1 with commit 4cccb6221cae Please see https://www.kernel.org or 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
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