CVE-2024-49866 (GCVE-0-2024-49866)
Vulnerability from cvelistv5
Published
2024-10-21 18:01
Modified
2026-08-05 11:40
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: tracing/timerlat: Fix a race during cpuhp processing There is another found exception that the "timerlat/1" thread was scheduled on CPU0, and lead to timer corruption finally: ``` ODEBUG: init active (active state 0) object: ffff888237c2e108 object type: hrtimer hint: timerlat_irq+0x0/0x220 WARNING: CPU: 0 PID: 426 at lib/debugobjects.c:518 debug_print_object+0x7d/0xb0 Modules linked in: CPU: 0 UID: 0 PID: 426 Comm: timerlat/1 Not tainted 6.11.0-rc7+ #45 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 RIP: 0010:debug_print_object+0x7d/0xb0 ... Call Trace: <TASK> ? __warn+0x7c/0x110 ? debug_print_object+0x7d/0xb0 ? report_bug+0xf1/0x1d0 ? prb_read_valid+0x17/0x20 ? handle_bug+0x3f/0x70 ? exc_invalid_op+0x13/0x60 ? asm_exc_invalid_op+0x16/0x20 ? debug_print_object+0x7d/0xb0 ? debug_print_object+0x7d/0xb0 ? __pfx_timerlat_irq+0x10/0x10 __debug_object_init+0x110/0x150 hrtimer_init+0x1d/0x60 timerlat_main+0xab/0x2d0 ? __pfx_timerlat_main+0x10/0x10 kthread+0xb7/0xe0 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x2d/0x40 ? __pfx_kthread+0x10/0x10 ret_from_fork_asm+0x1a/0x30 </TASK> ``` After tracing the scheduling event, it was discovered that the migration of the "timerlat/1" thread was performed during thread creation. Further analysis confirmed that it is because the CPU online processing for osnoise is implemented through workers, which is asynchronous with the offline processing. When the worker was scheduled to create a thread, the CPU may has already been removed from the cpu_online_mask during the offline process, resulting in the inability to select the right CPU: T1 | T2 [CPUHP_ONLINE] | cpu_device_down() osnoise_hotplug_workfn() | | cpus_write_lock() | takedown_cpu(1) | cpus_write_unlock() [CPUHP_OFFLINE] | cpus_read_lock() | start_kthread(1) | cpus_read_unlock() | To fix this, skip online processing if the CPU is already offline.
References
Impacted products
Vendor Product Version
Linux Linux Version: c8895e271f7994a3ecb13b8a280e39aa53879545
Version: c8895e271f7994a3ecb13b8a280e39aa53879545
Version: c8895e271f7994a3ecb13b8a280e39aa53879545
Version: c8895e271f7994a3ecb13b8a280e39aa53879545
Version: c8895e271f7994a3ecb13b8a280e39aa53879545
Version: c8895e271f7994a3ecb13b8a280e39aa53879545
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              "value": "AV:L - Both halves of the race are driven purely through local file interfaces \u2014 enabling the osnoise/timerlat tracer via tracefs (`current_tracer`, `osnoise/cpus`) and cycling `/sys/devices/system/cpu/cpuN/online` \u2014 with no network- or peer-facing consumer of `osnoise_hotplug_workfn()`.\nAC:L - The attacker controls both sides of the race: keep timerlat registered so `osnoise_has_registered_instances()` passes, then repeatedly toggle a CPU offline/online so the deferred `osnoise_hotplug_work` is still blocked on `trace_types_lock`/`cpus_read_lock()` when `takedown_cpu()` clears the CPU from `cpu_online_mask`; the window is hit reliably by looping hotplug, and the required configs (`TIMERLAT_TRACER`, `HOTPLUG_CPU`) are standard in distro kernels.\nPR:L - No `capable()` check guards the path \u2014 access is governed only by file permissions on tracefs and the CPU-hotplug sysfs node, which are routinely relaxed via the tracefs `gid=` mount option for tracing groups, in privileged/`/sys`-rw containers, and on latency-tooling (rtla/HPC) hosts; additionally CPU offline/online cycles are generated without root by suspend/resume and hypervisor vCPU hotplug while an admin-started timerlat session runs.\nUI:N - The attacker drives the tracer enable and the CPU hotplug cycling directly in a loop; no victim must open a file, mount a filesystem, or take any other action.\nS:U - The corrupted objects \u2014 the per-CPU `hrtimer_cpu_base` timerqueue and a freed `task_struct` \u2014 live in the same kernel security authority as the triggering code; no VM, container, or IOMMU boundary is crossed.\nC:H - The misplaced timerlat kthread leaves `tlat-\u003ekthread` pointing at an exited, freed `task_struct` that `timerlat_irq()` dereferences via `wake_up_process()` from hardirq context, so freed slab contents are read and acted upon; combined with the corrupted hrtimer rbtree this is exploitable for kernel memory disclosure.\nI:H - `__hrtimer_init()` performs `memset(timer, 0, sizeof(struct hrtimer))` on an hrtimer still enqueued in CPU0\u0027s timerqueue, zeroing a live rb_node and the callback pointer, and the dangling `tlat-\u003ekthread` yields a use-after-free write into a reclaimed `task_struct` \u2014 memory corruption of a type leverageable for control-flow hijack via heap grooming.\nA:H - The bug reproduces as a `debug_print_object()` WARNING (\"init active object\" on `timerlat_irq`) and proceeds to timer corruption \u2014 a zeroed node left linked in the hrtimer rbtree plus a NULL `timer-\u003efunction` invoked from hardirq \u2014 producing oops/panic or a hung timer subsystem, and an immediate panic under `panic_on_warn`/`panic_on_oops`."
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__warn+0x7c/0x110\\n ? debug_print_object+0x7d/0xb0\\n ? report_bug+0xf1/0x1d0\\n ? prb_read_valid+0x17/0x20\\n ? handle_bug+0x3f/0x70\\n ? exc_invalid_op+0x13/0x60\\n ? asm_exc_invalid_op+0x16/0x20\\n ? debug_print_object+0x7d/0xb0\\n ? debug_print_object+0x7d/0xb0\\n ? __pfx_timerlat_irq+0x10/0x10\\n __debug_object_init+0x110/0x150\\n hrtimer_init+0x1d/0x60\\n timerlat_main+0xab/0x2d0\\n ? __pfx_timerlat_main+0x10/0x10\\n kthread+0xb7/0xe0\\n ? __pfx_kthread+0x10/0x10\\n ret_from_fork+0x2d/0x40\\n ? __pfx_kthread+0x10/0x10\\n ret_from_fork_asm+0x1a/0x30\\n \u003c/TASK\u003e\\n```\\n\\nAfter tracing the scheduling event, it was discovered that the migration\\nof the \\\"timerlat/1\\\" thread was performed during thread creation. Further\\nanalysis confirmed that it is because the CPU online processing for\\nosnoise is implemented through workers, which is asynchronous with the\\noffline processing. When the worker was scheduled to create a thread, the\\nCPU may has already been removed from the cpu_online_mask during the offline\\nprocess, resulting in the inability to select the right CPU:\\n\\nT1                       | T2\\n[CPUHP_ONLINE]           | cpu_device_down()\\nosnoise_hotplug_workfn() |\\n                         |     cpus_write_lock()\\n                         |     takedown_cpu(1)\\n                         |     cpus_write_unlock()\\n[CPUHP_OFFLINE]          |\\n    cpus_read_lock()     |\\n    start_kthread(1)     |\\n    cpus_read_unlock()   |\\n\\nTo fix this, skip online processing if the CPU is already offline.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.168\", \"versionStartIncluding\": \"5.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.113\", \"versionStartIncluding\": \"5.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.55\", \"versionStartIncluding\": \"5.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10.14\", \"versionStartIncluding\": \"5.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.11.3\", \"versionStartIncluding\": \"5.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12\", \"versionStartIncluding\": \"5.14\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T20:40:44.796Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-49866\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-11T20:40:44.796Z\", \"dateReserved\": \"2024-10-21T12:17:06.018Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-10-21T18:01:09.284Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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