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{
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"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: Always flush async #PF workqueue when vCPU is being destroyed\n\nAlways flush the per-vCPU async #PF workqueue when a vCPU is clearing its\ncompletion queue, e.g. when a VM and all its vCPUs is being destroyed.\nKVM must ensure that none of its workqueue callbacks is running when the\nlast reference to the KVM _module_ is put. Gifting a reference to the\nassociated VM prevents the workqueue callback from dereferencing freed\nvCPU/VM memory, but does not prevent the KVM module from being unloaded\nbefore the callback completes.\n\nDrop the misguided VM refcount gifting, as calling kvm_put_kvm() from\nasync_pf_execute() if kvm_put_kvm() flushes the async #PF workqueue will\nresult in deadlock. async_pf_execute() can't return until kvm_put_kvm()\nfinishes, and kvm_put_kvm() can't return until async_pf_execute() finishes:\n\n WARNING: CPU: 8 PID: 251 at virt/kvm/kvm_main.c:1435 kvm_put_kvm+0x2d/0x320 [kvm]\n Modules linked in: vhost_net vhost vhost_iotlb tap kvm_intel kvm irqbypass\n CPU: 8 PID: 251 Comm: kworker/8:1 Tainted: G W 6.6.0-rc1-e7af8d17224a-x86/gmem-vm #119\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015\n Workqueue: events async_pf_execute [kvm]\n RIP: 0010:kvm_put_kvm+0x2d/0x320 [kvm]\n Call Trace:\n \n async_pf_execute+0x198/0x260 [kvm]\n process_one_work+0x145/0x2d0\n worker_thread+0x27e/0x3a0\n kthread+0xba/0xe0\n ret_from_fork+0x2d/0x50\n ret_from_fork_asm+0x11/0x20\n \n ---[ end trace 0000000000000000 ]---\n INFO: task kworker/8:1:251 blocked for more than 120 seconds.\n Tainted: G W 6.6.0-rc1-e7af8d17224a-x86/gmem-vm #119\n \"echo 0 > /proc/sys/kernel/hung_task_timeout_secs\" disables this message.\n task:kworker/8:1 state:D stack:0 pid:251 ppid:2 flags:0x00004000\n Workqueue: events async_pf_execute [kvm]\n Call Trace:\n \n __schedule+0x33f/0xa40\n schedule+0x53/0xc0\n schedule_timeout+0x12a/0x140\n __wait_for_common+0x8d/0x1d0\n __flush_work.isra.0+0x19f/0x2c0\n kvm_clear_async_pf_completion_queue+0x129/0x190 [kvm]\n kvm_arch_destroy_vm+0x78/0x1b0 [kvm]\n kvm_put_kvm+0x1c1/0x320 [kvm]\n async_pf_execute+0x198/0x260 [kvm]\n process_one_work+0x145/0x2d0\n worker_thread+0x27e/0x3a0\n kthread+0xba/0xe0\n ret_from_fork+0x2d/0x50\n ret_from_fork_asm+0x11/0x20\n \n\nIf kvm_clear_async_pf_completion_queue() actually flushes the workqueue,\nthen there's no need to gift async_pf_execute() a reference because all\ninvocations of async_pf_execute() will be forced to complete before the\nvCPU and its VM are destroyed/freed. And that in turn fixes the module\nunloading bug as __fput() won't do module_put() on the last vCPU reference\nuntil the vCPU has been freed, e.g. if closing the vCPU file also puts the\nlast reference to the KVM module.\n\nNote that kvm_check_async_pf_completion() may also take the work item off\nthe completion queue and so also needs to flush the work queue, as the\nwork will not be seen by kvm_clear_async_pf_completion_queue(). Waiting\non the workqueue could theoretically delay a vCPU due to waiting for the\nwork to complete, but that's a very, very small chance, and likely a very\nsmall delay. kvm_arch_async_page_present_queued() unconditionally makes a\nnew request, i.e. will effectively delay entering the guest, so the\nremaining work is really just:\n\n trace_kvm_async_pf_completed(addr, cr2_or_gpa);\n\n __kvm_vcpu_wake_up(vcpu);\n\n mmput(mm);\n\nand mmput() can't drop the last reference to the page tables if the vCPU is\nstill alive, i.e. the vCPU won't get stuck tearing down page tables.\n\nAdd a helper to do the flushing, specifically to deal with \"wakeup all\"\nwork items, as they aren't actually work items, i.e. are never placed in a\nworkqueue. Trying to flush a bogus workqueue entry rightly makes\n__flush_work() complain (kudos to whoever added that sanity check).\n\nNote, commit 5f6de5cbebee (\"KVM: Prevent module exit until al\n---truncated---",
"title": "Vulnerability description"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://cve.tuxcare.com/els/cve/CVE-2024-26976"
},
{
"category": "external",
"summary": "https://git.kernel.org/stable/c/3d75b8aa5c29058a512db29da7cbee8052724157",
"url": "https://git.kernel.org/stable/c/3d75b8aa5c29058a512db29da7cbee8052724157"
},
{
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"url": "https://git.kernel.org/stable/c/4f3a3bce428fb439c66a578adc447afce7b4a750"
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{
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"url": "https://git.kernel.org/stable/c/82e25cc1c2e93c3023da98be282322fc08b61ffb"
},
{
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"summary": "https://git.kernel.org/stable/c/83d3c5e309611ef593e2fcb78444fc8ceedf9bac",
"url": "https://git.kernel.org/stable/c/83d3c5e309611ef593e2fcb78444fc8ceedf9bac"
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{
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{
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"summary": "https://git.kernel.org/stable/c/ab2c2f5d9576112ad22cfd3798071cb74693b1f5",
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},
{
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"summary": "https://git.kernel.org/stable/c/b54478d20375874aeee257744dedfd3e413432ff",
"url": "https://git.kernel.org/stable/c/b54478d20375874aeee257744dedfd3e413432ff"
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{
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"summary": "https://git.kernel.org/stable/c/caa9af2e27c275e089d702cfbaaece3b42bca31b",
"url": "https://git.kernel.org/stable/c/caa9af2e27c275e089d702cfbaaece3b42bca31b"
},
{
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"summary": "https://git.kernel.org/stable/c/f8730d6335e5f43d09151fca1f0f41922209a264",
"url": "https://git.kernel.org/stable/c/f8730d6335e5f43d09151fca1f0f41922209a264"
},
{
"category": "external",
"summary": "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html",
"url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html"
},
{
"category": "external",
"summary": "https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html",
"url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html"
}
],
"release_date": "2024-05-01T06:15:00Z",
"remediations": [
{
"category": "none_available",
"date": "2026-08-05T12:10:21.973341Z",
"details": "Affected",
"product_ids": [
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],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
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"threats": [
{
"category": "impact",
"details": "Moderate"
}
]
}
]
}