CVE-2026-31540

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

drm/i915/gt: Check set_default_submission() before deferencing

When the i915 driver firmware binaries are not present, the

set_default_submission pointer is not set. This pointer is

dereferenced during suspend anyways.

Add a check to make sure it is set before dereferencing.

[ 23.289926] PM: suspend entry (deep)

[ 23.293558] Filesystems sync: 0.000 seconds

[ 23.298010] Freezing user space processes

[ 23.302771] Freezing user space processes completed (elapsed 0.000 seconds)

[ 23.309766] OOM killer disabled.

[ 23.313027] Freezing remaining freezable tasks

[ 23.318540] Freezing remaining freezable tasks completed (elapsed 0.001 seconds)

[ 23.342038] serial 00:05: disabled

[ 23.345719] serial 00:02: disabled

[ 23.349342] serial 00:01: disabled

[ 23.353782] sd 0:0:0:0: [sda] Synchronizing SCSI cache

[ 23.358993] sd 1:0:0:0: [sdb] Synchronizing SCSI cache

[ 23.361635] ata1.00: Entering standby power mode

[ 23.368863] ata2.00: Entering standby power mode

[ 23.445187] BUG: kernel NULL pointer dereference, address: 0000000000000000

[ 23.452194] #PF: supervisor instruction fetch in kernel mode

[ 23.457896] #PF: error_code(0x0010) - not-present page

[ 23.463065] PGD 0 P4D 0

[ 23.465640] Oops: Oops: 0010 [#1] SMP NOPTI

[ 23.469869] CPU: 8 UID: 0 PID: 211 Comm: kworker/u48:18 Tainted: G S W 6.19.0-rc4-00020-gf0b9d8eb98df #10 PREEMPT(voluntary)

[ 23.482512] Tainted: [S]=CPU_OUT_OF_SPEC, [W]=WARN

[ 23.496511] Workqueue: async async_run_entry_fn

[ 23.501087] RIP: 0010:0x0

[ 23.503755] Code: Unable to access opcode bytes at 0xffffffffffffffd6.

[ 23.510324] RSP: 0018:ffffb4a60065fca8 EFLAGS: 00010246

[ 23.515592] RAX: 0000000000000000 RBX: ffff9f428290e000 RCX: 000000000000000f

[ 23.522765] RDX: 0000000000000000 RSI: 0000000000000282 RDI: ffff9f428290e000

[ 23.529937] RBP: ffff9f4282907070 R08: ffff9f4281130428 R09: 00000000ffffffff

[ 23.537111] R10: 0000000000000000 R11: 0000000000000001 R12: ffff9f42829070f8

[ 23.544284] R13: ffff9f4282906028 R14: ffff9f4282900000 R15: ffff9f4282906b68

[ 23.551457] FS: 0000000000000000(0000) GS:ffff9f466b2cf000(0000) knlGS:0000000000000000

[ 23.559588] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

[ 23.565365] CR2: ffffffffffffffd6 CR3: 000000031c230001 CR4: 0000000000f70ef0

[ 23.572539] PKRU: 55555554

[ 23.575281] Call Trace:

[ 23.577770] <TASK>

[ 23.579905] intel_engines_reset_default_submission+0x42/0x60

[ 23.585695] __intel_gt_unset_wedged+0x191/0x200

[ 23.590360] intel_gt_unset_wedged+0x20/0x40

[ 23.594675] gt_sanitize+0x15e/0x170

[ 23.598290] i915_gem_suspend_late+0x6b/0x180

[ 23.602692] i915_drm_suspend_late+0x35/0xf0

[ 23.607008] ? __pfx_pci_pm_suspend_late+0x10/0x10

[ 23.611843] dpm_run_callback+0x78/0x1c0

[ 23.615817] device_suspend_late+0xde/0x2e0

[ 23.620037] async_suspend_late+0x18/0x30

[ 23.624082] async_run_entry_fn+0x25/0xa0

[ 23.628129] process_one_work+0x15b/0x380

[ 23.632182] worker_thread+0x2a5/0x3c0

[ 23.635973] ? __pfx_worker_thread+0x10/0x10

[ 23.640279] kthread+0xf6/0x1f0

[ 23.643464] ? __pfx_kthread+0x10/0x10

[ 23.647263] ? __pfx_kthread+0x10/0x10

[ 23.651045] ret_from_fork+0x131/0x190

[ 23.654837] ? __pfx_kthread+0x10/0x10

[ 23.658634] ret_from_fork_asm+0x1a/0x30

[ 23.662597] </TASK>

[ 23.664826] Modules linked in:

[ 23.667914] CR2: 0000000000000000

[ 23.671271] ------------[ cut here ]------------

(cherry picked from commit daa199abc3d3d1740c9e3a2c3e9216ae5b447cad)