CVE-2026-74717

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> net/mlx5: fw_tracer, return NULL on create error<br /> <br /> Tracer creation can fail by returning either NULL or ERR_PTR.<br /> The return value is stored without a check on the device, and users<br /> treat ERR_PTR and NULL the same way.<br /> This also causes a crash in the core dump logic, which is missing the<br /> ERR_PTR check and ends up dereferencing it, as shown in the trace below.<br /> <br /> Switch tracer creation to return NULL on failure only, so callers only<br /> need a single NULL check.<br /> <br /> Internal error: Oops: 0000000096000006 [#1] SMP<br /> Modules linked in: mlx5_ib ib_uverbs ib_core ipv6 mlx5_core<br /> CPU: 1 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.19.7 #1 PREEMPT(none)<br /> Workqueue: mlx5_health0001:01:00.0 mlx5_fw_reporter_err_work [mlx5_core]<br /> pstate: a3400009 (NzCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)<br /> pc : mlx5_fw_tracer_trigger_core_dump_general+0x58/0xe0 [mlx5_core]<br /> lr : mlx5_fw_tracer_trigger_core_dump_general+0x40/0xe0 [mlx5_core]<br /> sp : ffff800081cf3c40<br /> x29: ffff800081cf3c90 x28: 0000000000000000 x27: 0000000000000000<br /> x26: ffff000080018828 x25: 0000000000000000 x24: ffff000080304a05<br /> x23: ffff800081cf3d80 x22: ffff0000847e01a0 x21: 0000000000000000<br /> x20: ffff0000847e01a0 x19: ffffffffffffffa1 x18: ffff80008310bbf0<br /> x17: ffff800080119650 x16: ffff80008010df54 x15: ffff80008010d4ac<br /> x14: ffff800079c202e4 x13: ffff80008002fe60 x12: ffff800080119650<br /> x11: ffff80008010df54 x10: ffff80008010d4ac x9 : ffff800079c203d8<br /> x8 : ffff800081cf3c88 x7 : 0000000000000000 x6 : 0000000000000000<br /> x5 : 0000000000000000 x4 : 0000000000000008 x3 : 0000000000000030<br /> x2 : 0000000000000008 x1 : 0000000000000000 x0 : 00000000c5c4000e<br /> Call trace:<br /> mlx5_fw_tracer_trigger_core_dump_general+0x58/0xe0 [mlx5_core] (P)<br /> mlx5_fw_reporter_dump+0x30/0x2e0 [mlx5_core]<br /> devlink_health_do_dump+0x9c/0x160<br /> devlink_health_report+0x1c0/0x288<br /> mlx5_fw_reporter_err_work+0xac/0xc0 [mlx5_core]<br /> process_one_work+0x15c/0x3d8<br /> worker_thread+0x18c/0x320<br /> kthread+0x148/0x228<br /> ret_from_fork+0x10/0x20<br /> Code: b9400000 5ac00800 7a401800 540003ca (3940a260)<br /> ---[ end trace 0000000000000000 ]---<br /> Kernel panic - not syncing: Oops: Fatal exception<br /> SMP: stopping secondary CPUs<br /> Kernel Offset: disabled<br /> CPU features: 0x000000,00078031,75fce5a1,35fffe67<br /> Memory Limit: none<br /> ---[ end Kernel panic - not syncing: Oops: Fatal exception ]---