{ "cveId": "CVE-2024-56559", "url": "https://patchblox.com/security/cve/CVE-2024-56559", "summary": "CVE-2024-56559 is fixed in 36 products on 1 platform, first by DEBIAN-CVE-2024-56559, released December 27, 2024. It is not reported as exploited. Patch Radar priority: Routine.", "title": "linux: In the Linux kernel, the following vulnerability has been resolved: mm/vmalloc: combine all TLB flush operations of...", "description": "In the Linux kernel, the following vulnerability has been resolved: mm/vmalloc: combine all TLB flush operations of KASAN shadow virtual address into one operation When compiling kernel source \u0027make -j $(nproc)\u0027 with the up-and-running KASAN-enabled kernel on a 256-core machine, the following soft lockup is shown: watchdog: BUG: soft lockup - CPU#28 stuck for 22s! [kworker/28:1:1760] CPU: 28 PID: 1760 Comm: kworker/28:1 Kdump: loaded Not tainted 6.10.0-rc5 #95 Workqueue: events drain_vmap_area_work RIP: 0010:smp_call_function_many_cond\u002B0x1d8/0xbb0 Code: 38 c8 7c 08 84 c9 0f 85 49 08 00 00 8b 45 08 a8 01 74 2e 48 89 f1 49 89 f7 48 c1 e9 03 41 83 e7 07 4c 01 e9 41 83 c7 03 f3 90 \u003C0f\u003E b6 01 41 38 c7 7c 08 84 c0 0f 85 d4 06 00 00 8b 45 08 a8 01 75 RSP: 0018:ffffc9000cb3fb60 EFLAGS: 00000202 RAX: 0000000000000011 RBX: ffff8883bc4469c0 RCX: ffffed10776e9949 RDX: 0000000000000002 RSI: ffff8883bb74ca48 RDI: ffffffff8434dc50 RBP: ffff8883bb74ca40 R08: ffff888103585dc0 R09: ffff8884533a1800 R10: 0000000000000004 R11: ffffffffffffffff R12: ffffed1077888d39 R13: dffffc0000000000 R14: ffffed1077888d38 R15: 0000000000000003 FS: 0000000000000000(0000) GS:ffff8883bc400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005577b5c8d158 CR3: 0000000004850000 CR4: 0000000000350ef0 Call Trace: \u003CIRQ\u003E ? watchdog_timer_fn\u002B0x2cd/0x390 ? __pfx_watchdog_timer_fn\u002B0x10/0x10 ? __hrtimer_run_queues\u002B0x300/0x6d0 ? sched_clock_cpu\u002B0x69/0x4e0 ? __pfx___hrtimer_run_queues\u002B0x10/0x10 ? srso_return_thunk\u002B0x5/0x5f ? ktime_get_update_offsets_now\u002B0x7f/0x2a0 ? srso_return_thunk\u002B0x5/0x5f ? srso_return_thunk\u002B0x5/0x5f ? hrtimer_interrupt\u002B0x2ca/0x760 ? __sysvec_apic_timer_interrupt\u002B0x8c/0x2b0 ? sysvec_apic_timer_interrupt\u002B0x6a/0x90 \u003C/IRQ\u003E \u003CTASK\u003E ? asm_sysvec_apic_timer_interrupt\u002B0x16/0x20 ? smp_call_function_many_cond\u002B0x1d8/0xbb0 ? __pfx_do_kernel_range_flush\u002B0x10/0x10 on_each_cpu_cond_mask\u002B0x20/0x40 flush_tlb_kernel_range\u002B0x19b/0x250 ? srso_return_thunk\u002B0x5/0x5f ? kasan_release_vmalloc\u002B0xa7/0xc0 purge_vmap_node\u002B0x357/0x820 ? __pfx_purge_vmap_node\u002B0x10/0x10 __purge_vmap_area_lazy\u002B0x5b8/0xa10 drain_vmap_area_work\u002B0x21/0x30 process_one_work\u002B0x661/0x10b0 worker_thread\u002B0x844/0x10e0 ? srso_return_thunk\u002B0x5/0x5f ? __kthread_parkme\u002B0x82/0x140 ? __pfx_worker_thread\u002B0x10/0x10 kthread\u002B0x2a5/0x370 ? __pfx_kthread\u002B0x10/0x10 ret_from_fork\u002B0x30/0x70 ? __pfx_kthread\u002B0x10/0x10 ret_from_fork_asm\u002B0x1a/0x30 \u003C/TASK\u003E Debugging Analysis: 1. The following ftrace log shows that the lockup CPU spends too much time iterating vmap_nodes and flushing TLB when purging vm_area structures. (Some info is trimmed). kworker: funcgraph_entry: | drain_vmap_area_work() { kworker: funcgraph_entry: | mutex_lock() { kworker: funcgraph_entry: 1.092 us | __cond_resched(); kworker: funcgraph_exit: 3.306 us | } ... ... kworker: funcgraph_entry: | flush_tlb_kernel_range() { ... ... kworker: funcgraph_exit: # 7533.649 us | } ... ... kworker: funcgraph_entry: 2.344 us | mutex_unlock(); kworker: funcgraph_exit: $ 23871554 us | } The drain_vmap_area_work() spends over 23 seconds. There are 2805 flush_tlb_kernel_range() calls in the ftrace log. * One is called in __purge_vmap_area_lazy(). * Others are called by purge_vmap_node-\u003Ekasan_release_vmalloc. purge_vmap_node() iteratively releases kasan vmalloc allocations and flushes TLB for each vmap_area. - [Rough calculation] Each flush_tlb_kernel_range() runs about 7.5ms. -- 2804 * 7.5ms = 21.03 seconds. -- That\u0027s why a soft lock is triggered. 2. Extending the soft lockup time can work around the issue (For example, # echo ---truncated---", "published": "2024-12-27T15:15:14Z", "severity": "medium", "cvss": 5.5, "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "epss": 0.00145, "epssPercentile": 0.03798, "priority": "Routine", "priorityTier": 4, "exploited": false, "vendorExploited": false, "disclosed": false, "fixes": [ { "platform": "linux", "product": "kernel-uek", "release": "ol 10", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", "fix": "ELSA-2025-20480", "url": "https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek", "release": "ol 9", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", "fix": "ELSA-2025-20480", "url": "https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-core", "release": "ol 10", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", "fix": "ELSA-2025-20480", "url": "https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-core", "release": "ol 9", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", "fix": "ELSA-2025-20480", "url": "https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-debug", "release": "ol 10", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", "fix": "ELSA-2025-20480", "url": "https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-debug", "release": "ol 9", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", "fix": "ELSA-2025-20480", "url": "https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-debug-core", "release": "ol 10", "fixedVersion": 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"https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-modules-desktop", "release": "ol 9", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", "fix": "ELSA-2025-20480", "url": "https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-modules-extra", "release": "ol 10", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", "fix": "ELSA-2025-20480", "url": "https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-modules-extra", "release": "ol 9", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", "fix": "ELSA-2025-20480", "url": "https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-modules-extra-netfilter", "release": "ol 10", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", "fix": "ELSA-2025-20480", "url": "https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-modules-extra-netfilter", "release": "ol 9", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", "fix": "ELSA-2025-20480", "url": "https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-modules-usb", "release": "ol 10", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", "fix": "ELSA-2025-20480", "url": "https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-modules-usb", "release": "ol 9", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", "fix": "ELSA-2025-20480", "url": "https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-modules-wireless", "release": "ol 10", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", "fix": "ELSA-2025-20480", "url": "https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-modules-wireless", "release": "ol 9", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", "fix": "ELSA-2025-20480", "url": "https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-tools", "release": "ol 10", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", "fix": "ELSA-2025-20480", "url": "https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-tools", "release": "ol 9", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", "fix": "ELSA-2025-20480", "url": "https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { 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