{ "cveId": "CVE-2024-56547", "url": "https://patchblox.com/security/cve/CVE-2024-56547", "summary": "CVE-2024-56547 is fixed in 37 products on 1 platform, first by DEBIAN-CVE-2024-56547, 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: rcu/nocb: Fix missed RCU barrier on deoffloading...", "description": "In the Linux kernel, the following vulnerability has been resolved: rcu/nocb: Fix missed RCU barrier on deoffloading Currently, running rcutorture test with torture_type=rcu fwd_progress=8 n_barrier_cbs=8 nocbs_nthreads=8 nocbs_toggle=100 onoff_interval=60 test_boost=2, will trigger the following warning: \tWARNING: CPU: 19 PID: 100 at kernel/rcu/tree_nocb.h:1061 rcu_nocb_rdp_deoffload\u002B0x292/0x2a0 \tRIP: 0010:rcu_nocb_rdp_deoffload\u002B0x292/0x2a0 \t Call Trace: \t \u003CTASK\u003E \t ? __warn\u002B0x7e/0x120 \t ? rcu_nocb_rdp_deoffload\u002B0x292/0x2a0 \t ? report_bug\u002B0x18e/0x1a0 \t ? handle_bug\u002B0x3d/0x70 \t ? exc_invalid_op\u002B0x18/0x70 \t ? asm_exc_invalid_op\u002B0x1a/0x20 \t ? rcu_nocb_rdp_deoffload\u002B0x292/0x2a0 \t rcu_nocb_cpu_deoffload\u002B0x70/0xa0 \t rcu_nocb_toggle\u002B0x136/0x1c0 \t ? __pfx_rcu_nocb_toggle\u002B0x10/0x10 \t kthread\u002B0xd1/0x100 \t ? __pfx_kthread\u002B0x10/0x10 \t ret_from_fork\u002B0x2f/0x50 \t ? __pfx_kthread\u002B0x10/0x10 \t ret_from_fork_asm\u002B0x1a/0x30 \t \u003C/TASK\u003E CPU0 CPU2 CPU3 //rcu_nocb_toggle //nocb_cb_wait //rcutorture // deoffload CPU1 // process CPU1\u0027s rdp rcu_barrier() rcu_segcblist_entrain() rcu_segcblist_add_len(1); // len == 2 // enqueue barrier // callback to CPU1\u0027s // rdp-\u003Ecblist rcu_do_batch() // invoke CPU1\u0027s rdp-\u003Ecblist // callback rcu_barrier_callback() rcu_barrier() mutex_lock(\u0026rcu_state.barrier_mutex); // still see len == 2 // enqueue barrier callback // to CPU1\u0027s rdp-\u003Ecblist rcu_segcblist_entrain() rcu_segcblist_add_len(1); // len == 3 // decrement len rcu_segcblist_add_len(-2); kthread_parkme() // CPU1\u0027s rdp-\u003Ecblist len == 1 // Warn because there is // still a pending barrier // trigger warning WARN_ON_ONCE(rcu_segcblist_n_cbs(\u0026rdp-\u003Ecblist)); cpus_read_unlock(); // wait CPU1 to comes online and // invoke barrier callback on // CPU1 rdp\u0027s-\u003Ecblist wait_for_completion(\u0026rcu_state.barrier_completion); // deoffload CPU4 cpus_read_lock() rcu_barrier() mutex_lock(\u0026rcu_state.barrier_mutex); // block on barrier_mutex // wait rcu_barrier() on // CPU3 to unlock barrier_mutex // but CPU3 unlock barrier_mutex // need to wait CPU1 comes online // when CPU1 going online will block on cpus_write_lock The above scenario will not only trigger a WARN_ON_ONCE(), but also trigger a deadlock. Thanks to nocb locking, a second racing rcu_barrier() on an offline CPU will either observe the decremented callback counter down to 0 and spare the callback enqueue, or rcuo will observe the new callback and keep rdp-\u003Enocb_cb_sleep to false. Therefore check rdp-\u003Enocb_cb_sleep before parking to make sure no further rcu_barrier() is waiting on the rdp.", "published": "2024-12-27T00:00:00Z", "severity": "medium", "cvss": 5.5, "cvssVector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "epss": 0.00206, "epssPercentile": 0.10677, "priority": "Routine", "priorityTier": 4, "exploited": false, "vendorExploited": false, "disclosed": false, "fixes": [ { "platform": "linux", "product": "kernel", "release": "RHEL 10", "fixedVersion": "6.12.0-55.76.1.el10_0", "fix": "RHSA-2026:22334", "url": "https://patchblox.com/security/fix/linux/rhsa-2026-22334", "released": "2026-04-30T14:22:30Z" }, { "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": "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 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-devel", "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-devel", "release": 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