CVE-2026-31494

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

net: macb: use the current queue number for stats

There's a potential mismatch between the memory reserved for statistics

and the amount of memory written.

gem_get_sset_count() correctly computes the number of stats based on the

active queues, whereas gem_get_ethtool_stats() indiscriminately copies

data using the maximum number of queues, and in the case the number of

active queues is less than MACB_MAX_QUEUES, this results in a OOB write

as observed in the KASAN splat.

==================================================================

BUG: KASAN: vmalloc-out-of-bounds in gem_get_ethtool_stats+0x54/0x78

[macb]

Write of size 760 at addr ffff80008080b000 by task ethtool/1027

CPU: [...]

Tainted: [E]=UNSIGNED_MODULE

Hardware name: raspberrypi rpi/rpi, BIOS 2025.10 10/01/2025

Call trace:

show_stack+0x20/0x38 (C)

dump_stack_lvl+0x80/0xf8

print_report+0x384/0x5e0

kasan_report+0xa0/0xf0

kasan_check_range+0xe8/0x190

__asan_memcpy+0x54/0x98

gem_get_ethtool_stats+0x54/0x78 [macb

926c13f3af83b0c6fe64badb21ec87d5e93fcf65]

dev_ethtool+0x1220/0x38c0

dev_ioctl+0x4ac/0xca8

sock_do_ioctl+0x170/0x1d8

sock_ioctl+0x484/0x5d8

__arm64_sys_ioctl+0x12c/0x1b8

invoke_syscall+0xd4/0x258

el0_svc_common.constprop.0+0xb4/0x240

do_el0_svc+0x48/0x68

el0_svc+0x40/0xf8

el0t_64_sync_handler+0xa0/0xe8

el0t_64_sync+0x1b0/0x1b8

The buggy address belongs to a 1-page vmalloc region starting at

0xffff80008080b000 allocated at dev_ethtool+0x11f0/0x38c0

The buggy address belongs to the physical page:

page: refcount:1 mapcount:0 mapping:0000000000000000

index:0xffff00000a333000 pfn:0xa333

flags: 0x7fffc000000000(node=0|zone=0|lastcpupid=0x1ffff)

raw: 007fffc000000000 0000000000000000 dead000000000122 0000000000000000

raw: ffff00000a333000 0000000000000000 00000001ffffffff 0000000000000000

page dumped because: kasan: bad access detected

Memory state around the buggy address:

ffff80008080b080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

ffff80008080b100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

>ffff80008080b180: 00 00 00 00 00 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8

^

ffff80008080b200: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8

ffff80008080b280: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8

==================================================================

Fix it by making sure the copied size only considers the active number of

queues.