FKIE_CVE-2025-68800

Vulnerability from fkie_nvd - Published: 2026-01-13 16:16 - Updated: 2026-04-15 00:35
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: mlxsw: spectrum_mr: Fix use-after-free when updating multicast route stats Cited commit added a dedicated mutex (instead of RTNL) to protect the multicast route list, so that it will not change while the driver periodically traverses it in order to update the kernel about multicast route stats that were queried from the device. One instance of list entry deletion (during route replace) was missed and it can result in a use-after-free [1]. Fix by acquiring the mutex before deleting the entry from the list and releasing it afterwards. [1] BUG: KASAN: slab-use-after-free in mlxsw_sp_mr_stats_update+0x4a5/0x540 drivers/net/ethernet/mellanox/mlxsw/spectrum_mr.c:1006 [mlxsw_spectrum] Read of size 8 at addr ffff8881523c2fa8 by task kworker/2:5/22043 CPU: 2 UID: 0 PID: 22043 Comm: kworker/2:5 Not tainted 6.18.0-rc1-custom-g1a3d6d7cd014 #1 PREEMPT(full) Hardware name: Mellanox Technologies Ltd. MSN2010/SA002610, BIOS 5.6.5 08/24/2017 Workqueue: mlxsw_core mlxsw_sp_mr_stats_update [mlxsw_spectrum] Call Trace: <TASK> dump_stack_lvl+0xba/0x110 print_report+0x174/0x4f5 kasan_report+0xdf/0x110 mlxsw_sp_mr_stats_update+0x4a5/0x540 drivers/net/ethernet/mellanox/mlxsw/spectrum_mr.c:1006 [mlxsw_spectrum] process_one_work+0x9cc/0x18e0 worker_thread+0x5df/0xe40 kthread+0x3b8/0x730 ret_from_fork+0x3e9/0x560 ret_from_fork_asm+0x1a/0x30 </TASK> Allocated by task 29933: kasan_save_stack+0x30/0x50 kasan_save_track+0x14/0x30 __kasan_kmalloc+0x8f/0xa0 mlxsw_sp_mr_route_add+0xd8/0x4770 [mlxsw_spectrum] mlxsw_sp_router_fibmr_event_work+0x371/0xad0 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c:7965 [mlxsw_spectrum] process_one_work+0x9cc/0x18e0 worker_thread+0x5df/0xe40 kthread+0x3b8/0x730 ret_from_fork+0x3e9/0x560 ret_from_fork_asm+0x1a/0x30 Freed by task 29933: kasan_save_stack+0x30/0x50 kasan_save_track+0x14/0x30 __kasan_save_free_info+0x3b/0x70 __kasan_slab_free+0x43/0x70 kfree+0x14e/0x700 mlxsw_sp_mr_route_add+0x2dea/0x4770 drivers/net/ethernet/mellanox/mlxsw/spectrum_mr.c:444 [mlxsw_spectrum] mlxsw_sp_router_fibmr_event_work+0x371/0xad0 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c:7965 [mlxsw_spectrum] process_one_work+0x9cc/0x18e0 worker_thread+0x5df/0xe40 kthread+0x3b8/0x730 ret_from_fork+0x3e9/0x560 ret_from_fork_asm+0x1a/0x30
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/216afc198484fde110ebeafc017992266f4596ce
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/37ca08b35a27ce8fd8e74dd3fd2ae21c23b63b73
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4049a6ace209f4ed150429f86ae796d7d6a4c22b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5f2831fc593c2b2efbff7dd0dd7441cec76adcd5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6e367c361a523a4b54fe618215c64a0ee189caf0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8ac1dacec458f55f871f7153242ed6ab60373b90
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b957366f5611bbaba03dd10ef861283347ddcc88
Impacted products
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmlxsw: spectrum_mr: Fix use-after-free when updating multicast route stats\n\nCited commit added a dedicated mutex (instead of RTNL) to protect the\nmulticast route list, so that it will not change while the driver\nperiodically traverses it in order to update the kernel about multicast\nroute stats that were queried from the device.\n\nOne instance of list entry deletion (during route replace) was missed\nand it can result in a use-after-free [1].\n\nFix by acquiring the mutex before deleting the entry from the list and\nreleasing it afterwards.\n\n[1]\nBUG: KASAN: slab-use-after-free in mlxsw_sp_mr_stats_update+0x4a5/0x540 drivers/net/ethernet/mellanox/mlxsw/spectrum_mr.c:1006 [mlxsw_spectrum]\nRead of size 8 at addr ffff8881523c2fa8 by task kworker/2:5/22043\n\nCPU: 2 UID: 0 PID: 22043 Comm: kworker/2:5 Not tainted 6.18.0-rc1-custom-g1a3d6d7cd014 #1 PREEMPT(full)\nHardware name: Mellanox Technologies Ltd. MSN2010/SA002610, BIOS 5.6.5 08/24/2017\nWorkqueue: mlxsw_core mlxsw_sp_mr_stats_update [mlxsw_spectrum]\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0xba/0x110\n print_report+0x174/0x4f5\n kasan_report+0xdf/0x110\n mlxsw_sp_mr_stats_update+0x4a5/0x540 drivers/net/ethernet/mellanox/mlxsw/spectrum_mr.c:1006 [mlxsw_spectrum]\n process_one_work+0x9cc/0x18e0\n worker_thread+0x5df/0xe40\n kthread+0x3b8/0x730\n ret_from_fork+0x3e9/0x560\n ret_from_fork_asm+0x1a/0x30\n \u003c/TASK\u003e\n\nAllocated by task 29933:\n kasan_save_stack+0x30/0x50\n kasan_save_track+0x14/0x30\n __kasan_kmalloc+0x8f/0xa0\n mlxsw_sp_mr_route_add+0xd8/0x4770 [mlxsw_spectrum]\n mlxsw_sp_router_fibmr_event_work+0x371/0xad0 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c:7965 [mlxsw_spectrum]\n process_one_work+0x9cc/0x18e0\n worker_thread+0x5df/0xe40\n kthread+0x3b8/0x730\n ret_from_fork+0x3e9/0x560\n ret_from_fork_asm+0x1a/0x30\n\nFreed by task 29933:\n kasan_save_stack+0x30/0x50\n kasan_save_track+0x14/0x30\n __kasan_save_free_info+0x3b/0x70\n __kasan_slab_free+0x43/0x70\n kfree+0x14e/0x700\n mlxsw_sp_mr_route_add+0x2dea/0x4770 drivers/net/ethernet/mellanox/mlxsw/spectrum_mr.c:444 [mlxsw_spectrum]\n mlxsw_sp_router_fibmr_event_work+0x371/0xad0 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c:7965 [mlxsw_spectrum]\n process_one_work+0x9cc/0x18e0\n worker_thread+0x5df/0xe40\n kthread+0x3b8/0x730\n ret_from_fork+0x3e9/0x560\n ret_from_fork_asm+0x1a/0x30"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nmlxsw: spectrum_mr: Correcci\u00f3n de uso despu\u00e9s de liberaci\u00f3n al actualizar las estad\u00edsticas de rutas de multidifusi\u00f3n\n\nEl commit citado a\u00f1adi\u00f3 un mutex dedicado (en lugar de RTNL) para proteger la lista de rutas de multidifusi\u00f3n, de modo que no cambie mientras el controlador la recorre peri\u00f3dicamente para actualizar al kernel sobre las estad\u00edsticas de rutas de multidifusi\u00f3n que fueron consultadas desde el dispositivo.\n\nUna instancia de eliminaci\u00f3n de entrada de lista (durante el reemplazo de ruta) fue omitida y puede resultar en un uso despu\u00e9s de liberaci\u00f3n [1].\n\nCorrecci\u00f3n al adquirir el mutex antes de eliminar la entrada de la lista y liberarlo despu\u00e9s.\n\n[1]\nERROR: KASAN: uso despu\u00e9s de liberaci\u00f3n de slab en mlxsw_sp_mr_stats_update+0x4a5/0x540 drivers/net/ethernet/mellanox/mlxsw/spectrum_mr.c:1006 [mlxsw_spectrum]\nLectura de tama\u00f1o 8 en la direcci\u00f3n ffff8881523c2fa8 por la tarea kworker/2:5/22043\n\nCPU: 2 UID: 0 PID: 22043 Comm: kworker/2:5 Not tainted 6.18.0-rc1-custom-g1a3d6d7cd014 #1 PREEMPT(full)\nNombre del hardware: Mellanox Technologies Ltd. MSN2010/SA002610, BIOS 5.6.5 08/24/2017\nCola de trabajo: mlxsw_core mlxsw_sp_mr_stats_update [mlxsw_spectrum]\nRastro de llamada:\n \n dump_stack_lvl+0xba/0x110\n print_report+0x174/0x4f5\n kasan_report+0xdf/0x110\n mlxsw_sp_mr_stats_update+0x4a5/0x540 drivers/net/ethernet/mellanox/mlxsw/spectrum_mr.c:1006 [mlxsw_spectrum]\n process_one_work+0x9cc/0x18e0\n worker_thread+0x5df/0xe40\n kthread+0x3b8/0x730\n ret_from_fork+0x3e9/0x560\n ret_from_fork_asm+0x1a/0x30\n \n\nAsignado por la tarea 29933:\n kasan_save_stack+0x30/0x50\n kasan_save_track+0x14/0x30\n __kasan_kmalloc+0x8f/0xa0\n mlxsw_sp_mr_route_add+0xd8/0x4770 [mlxsw_spectrum]\n mlxsw_sp_router_fibmr_event_work+0x371/0xad0 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c:7965 [mlxsw_spectrum]\n process_one_work+0x9cc/0x18e0\n worker_thread+0x5df/0xe40\n kthread+0x3b8/0x730\n ret_from_fork+0x3e9/0x560\n ret_from_fork_asm+0x1a/0x30\n\nLiberado por la tarea 29933:\n kasan_save_stack+0x30/0x50\n kasan_save_track+0x14/0x30\n __kasan_save_free_info+0x3b/0x70\n __kasan_slab_free+0x43/0x70\n kfree+0x14e/0x700\n mlxsw_sp_mr_route_add+0x2dea/0x4770 drivers/net/ethernet/mellanox/mlxsw/spectrum_mr.c:444 [mlxsw_spectrum]\n mlxsw_sp_router_fibmr_event_work+0x371/0xad0 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c:7965 [mlxsw_spectrum]\n process_one_work+0x9cc/0x18e0\n worker_thread+0x5df/0xe40\n kthread+0x3b8/0x730\n ret_from_fork+0x3e9/0x560\n ret_from_fork_asm+0x1a/0x30"
    }
  ],
  "id": "CVE-2025-68800",
  "lastModified": "2026-04-15T00:35:42.020",
  "metrics": {},
  "published": "2026-01-13T16:16:02.023",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/216afc198484fde110ebeafc017992266f4596ce"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/37ca08b35a27ce8fd8e74dd3fd2ae21c23b63b73"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4049a6ace209f4ed150429f86ae796d7d6a4c22b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5f2831fc593c2b2efbff7dd0dd7441cec76adcd5"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6e367c361a523a4b54fe618215c64a0ee189caf0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8ac1dacec458f55f871f7153242ed6ab60373b90"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b957366f5611bbaba03dd10ef861283347ddcc88"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}


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