Linux Kernel IPv6 network stack Vulnerability Allows Unauthenticated Remote Kernel Panic

Status: UPDATED  |  Advisory ID: CVE-2026-74717

Key Details

Affected Products, Subsystems & Sectors

What to Know

In the Linux kernel, the following vulnerability has been resolved:

net/mlx5: fw_tracer, return NULL on create error

Tracer creation can fail by returning either NULL or ERR_PTR.

The return value is stored without a check on the device, and users

treat ERR_PTR and NULL the same way.

This also causes a crash in the core dump logic, which is missing the

ERR_PTR check and ends up dereferencing it, as shown in the trace below.

Switch tracer creation to return NULL on failure only, so callers only

need a single NULL check.

Internal error: Oops: 0000000096000006 [#1] SMP

Modules linked in: mlx5_ib ib_uverbs ib_core ipv6 mlx5_core

CPU: 1 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.19.7 #1 PREEMPT(none)

Workqueue: mlx5_health0001:01:00.0 mlx5_fw_reporter_err_work [mlx5_core]

pstate: a3400009 (NzCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)

pc : mlx5_fw_tracer_trigger_core_dump_general+0x58/0xe0 [mlx5_core]

lr : mlx5_fw_tracer_trigger_core_dump_general+0x40/0xe0 [mlx5_core]

sp : ffff800081cf3c40

x29: ffff800081cf3c90 x28: 0000000000000000 x27: 0000000000000000

x26: ffff000080018828 x25: 0000000000000000 x24: ffff000080304a05

x23: ffff800081cf3d80 x22: ffff0000847e01a0 x21: 0000000000000000

x20: ffff0000847e01a0 x19: ffffffffffffffa1 x18: ffff80008310bbf0

x17: ffff800080119650 x16: ffff80008010df54 x15: ffff80008010d4ac

x14: ffff800079c202e4 x13: ffff80008002fe60 x12: ffff800080119650

x11: ffff80008010df54 x10: ffff80008010d4ac x9 : ffff800079c203d8

x8 : ffff800081cf3c88 x7 : 0000000000000000 x6 : 0000000000000000

x5 : 0000000000000000 x4 : 0000000000000008 x3 : 0000000000000030

x2 : 0000000000000008 x1 : 0000000000000000 x0 : 00000000c5c4000e

Call trace:

mlx5_fw_tracer_trigger_core_dump_general+0x58/0xe0 [mlx5_core] (P)

mlx5_fw_reporter_dump+0x30/0x2e0 [mlx5_core]

devlink_health_do_dump+0x9c/0x160

devlink_health_report+0x1c0/0x288

mlx5_fw_reporter_err_work+0xac/0xc0 [mlx5_core]

process_one_work+0x15c/0x3d8

worker_thread+0x18c/0x320

kthread+0x148/0x228

ret_from_fork+0x10/0x20

Code: b9400000 5ac00800 7a401800 540003ca (3940a260)

---[ end trace 0000000000000000 ]---

Kernel panic - not syncing: Oops: Fatal exception

SMP: stopping secondary CPUs

Kernel Offset: disabled

CPU features: 0x000000,00078031,75fce5a1,35fffe67

Memory Limit: none

---[ end Kernel panic - not syncing: Oops: Fatal exception ]--- (NVD)

What to Do

Monitor Linux's web page for any future patch releases.

References