{"id":"CVE-2025-39979","revision":"cab85319532944c48ece3822a49dffaf","records":[{"revision":"cab85319532944c48ece3822a49dffaf","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2025-39979","aliases":[],"title":"net/mlx5: fs, fix UAF in flow counter release","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5: fs, fix UAF in flow counter release\n\nFix a kernel trace [1] caused by releasing an HWS action of a local flow\ncounter in mlx5_cmd_hws_delete_fte(), where the HWS action refcount and\nmutex were not initialized and the counter struct could already be freed\nwhen deleting the rule.\n\nFix it by adding the missing initializations and adding refcount for the\nlocal flow counter struct.\n\n[1] Kernel log:\n Call Trace:\n  <TASK>\n  dump_stack_lvl+0x34/0x48\n  mlx5_fs_put_hws_action.part.0.cold+0x21/0x94 [mlx5_core]\n  mlx5_fc_put_hws_action+0x96/0xad [mlx5_core]\n  mlx5_fs_destroy_fs_actions+0x8b/0x152 [mlx5_core]\n  mlx5_cmd_hws_delete_fte+0x5a/0xa0 [mlx5_core]\n  del_hw_fte+0x1ce/0x260 [mlx5_core]\n  mlx5_del_flow_rules+0x12d/0x240 [mlx5_core]\n  ? ttwu_queue_wakelist+0xf4/0x110\n  mlx5_ib_destroy_flow+0x103/0x1b0 [mlx5_ib]\n  uverbs_free_flow+0x20/0x50 [ib_uverbs]\n  destroy_hw_idr_uobject+0x1b/0x50 [ib_uverbs]\n  uverbs_destroy_uobject+0x34/0x1a0 [ib_uverbs]\n  uobj_destroy+0x3c/0x80 [ib_uverbs]\n  ib_uverbs_run_method+0x23e/0x360 [ib_uverbs]\n  ? uverbs_finalize_object+0x60/0x60 [ib_uverbs]\n  ib_uverbs_cmd_verbs+0x14f/0x2c0 [ib_uverbs]\n  ? do_tty_write+0x1a9/0x270\n  ? file_tty_write.constprop.0+0x98/0xc0\n  ? new_sync_write+0xfc/0x190\n  ib_uverbs_ioctl+0xd7/0x160 [ib_uverbs]\n  __x64_sys_ioctl+0x87/0xc0\n  do_syscall_64+0x59/0x90","state":0,"publishedAt":"2025-10-15T07:55:59.609+00:00","modifiedAt":"2026-10-15T22:02:35.358+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/net/ethernet/mellanox/mlx5/core/fs_core.c\",\n                        \"drivers/net/ethernet/mellanox/mlx5/core/fs_core.h\",\n                        \"drivers/net/ethernet/mellanox/mlx5/core/fs_counters.c\",\n                        \"drivers/net/ethernet/mellanox/mlx5/core/steering/hws/fs_hws_pools.c\",\n                        \"include/linux/mlx5/fs.h\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"b581f4266928d3b5d1bbe711e39623d9a1696091\",\n                            \"lessThan\": \"3c77f6d244188c3fb11f6aec40bbfe884f1803b5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b581f4266928d3b5d1bbe711e39623d9a1696091\",\n                            \"lessThan\": \"6043819e707cefb1c9e59d6e431dcfa735c4f975\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/net/ethernet/mellanox/mlx5/core/fs_core.c\",\n                        \"drivers/net/ethernet/mellanox/mlx5/core/fs_core.h\",\n                        \"drivers/net/ethernet/mellanox/mlx5/core/fs_counters.c\",\n                        \"drivers/net/ethernet/mellanox/mlx5/core/steering/hws/fs_hws_pools.c\",\n                        \"include/linux/mlx5/fs.h\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.14\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.14\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.16.10\",\n                            \"lessThanOrEqual\": \"6.16.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.17\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/3c77f6d244188c3fb11f6aec40bbfe884f1803b5","https://git.kernel.org/stable/c/6043819e707cefb1c9e59d6e431dcfa735c4f975"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-39979","license":"CVE Program Terms of Use","key":"cve-program:CVE-2025-39979","identifiers":["CVE-2025-39979"]},"retained":false,"historicalAffected":[]}],"coverage":[]}