CVE-2026-31494High· 7.8▾ TwilightIn 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_ss…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.1%
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.
Linux >= 512286bbd4b7d5b15d26ba8078c8bfd1fc1129bd < 9738be665544281aa624842812c2fbfed6f88226Linux >= 512286bbd4b7d5b15d26ba8078c8bfd1fc1129bd < 240c5302eed83e34e98db18f6795ee5f40814024Linux >= 512286bbd4b7d5b15d26ba8078c8bfd1fc1129bd < 9596759a84e1dbf2670518d85e969208960041f9Linux >= 512286bbd4b7d5b15d26ba8078c8bfd1fc1129bd < 95246341945163ad9a250a87ca5bd1c1252777aeLinux >= 512286bbd4b7d5b15d26ba8078c8bfd1fc1129bd < 9d74d10e4e26672e139a8bcf8bf95957bf2d160fLinux >= 512286bbd4b7d5b15d26ba8078c8bfd1fc1129bd < 7ff87da099210856cbfe2f2f7f52ddfa57af4f0cLinux >= 512286bbd4b7d5b15d26ba8078c8bfd1fc1129bd < e182fe273cdf5a8931592228196ef514ffac392bLinux >= 512286bbd4b7d5b15d26ba8078c8bfd1fc1129bd < 72d96e4e24bbefdcfbc68bdb9341a05d8f5cb6e5Linux 4.16Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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