CVE-2025-68800 (GCVE-0-2025-68800)
Vulnerability from cvelistv5
Published
2026-01-13 15:29
Modified
2026-08-05 12:11
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: 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
Impacted products
Vendor Product Version
Linux Linux Version: f38656d067257cc43b652958dd154e1ab0773701
Version: f38656d067257cc43b652958dd154e1ab0773701
Version: f38656d067257cc43b652958dd154e1ab0773701
Version: f38656d067257cc43b652958dd154e1ab0773701
Version: f38656d067257cc43b652958dd154e1ab0773701
Version: f38656d067257cc43b652958dd154e1ab0773701
Version: f38656d067257cc43b652958dd154e1ab0773701
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          "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"
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              "value": "AV:L - The vulnerable replacement is reached through local MRT_ADD_MFC or MRT6_ADD_MFC setsockopt operations; received multicast packets alone only create unresolved entries and do not invoke the replace path.\nAC:L - The caller can repeatedly replace routes and enlarge the route list until the five-second statistics worker overlaps the deletion, making the race attacker-amplifiable and repeatable.\nPR:L - A namespace-scoped CAP_NET_RAW holder can create and register the multicast-routing control socket, after which replacements bypass CAP_NET_ADMIN; this is reachable by namespace-local administrators when the mlxsw device is delegated to their network namespace.\nUI:N - Once the attacker controls the multicast-routing socket, route replacements require no action by another user.\nS:U - The use-after-free compromises the same host kernel security authority in which the vulnerable driver executes; ordinary namespace-to-kernel escalation does not change CVSS scope.\nC:H - Reclaiming the freed route object gives attacker influence over stale route_priv and mfc pointers that the worker dereferences, supporting access to arbitrary kernel memory.\nI:H - The worker performs multiple atomic writes through the stale mfc pointer, allowing a reclaimed object to provide an arbitrary-target write primitive and potential kernel code execution.\nA:H - The demonstrated use-after-free can dereference reclaimed memory or poisoned list links, causing a kernel oops or panic and complete loss of availability."
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    "cveId": "CVE-2025-68800",
    "datePublished": "2026-01-13T15:29:09.688Z",
    "dateReserved": "2025-12-24T10:30:51.044Z",
    "dateUpdated": "2026-08-05T12:11:34.101Z",
    "state": "PUBLISHED"
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\"https://git.kernel.org/stable/c/8ac1dacec458f55f871f7153242ed6ab60373b90\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.248\", \"versionStartIncluding\": \"5.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.198\", \"versionStartIncluding\": \"5.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.160\", \"versionStartIncluding\": \"5.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.120\", \"versionStartIncluding\": \"5.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.64\", \"versionStartIncluding\": \"5.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.3\", \"versionStartIncluding\": \"5.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19\", \"versionStartIncluding\": \"5.7\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T21:53:35.012Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-68800\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-16T16:50:24.711Z\", \"dateReserved\": \"2025-12-24T10:30:51.044Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-01-13T15:29:09.688Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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