FKIE_CVE-2026-31494

Vulnerability from fkie_nvd - Published: 2026-04-22 14:16 - Updated: 2026-04-28 14:44
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/240c5302eed83e34e98db18f6795ee5f40814024Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/72d96e4e24bbefdcfbc68bdb9341a05d8f5cb6e5Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7ff87da099210856cbfe2f2f7f52ddfa57af4f0cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/95246341945163ad9a250a87ca5bd1c1252777aePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9596759a84e1dbf2670518d85e969208960041f9Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9738be665544281aa624842812c2fbfed6f88226Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9d74d10e4e26672e139a8bcf8bf95957bf2d160fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e182fe273cdf5a8931592228196ef514ffac392bPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 4.16
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
To clipboard 

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  "cveTags": [],
  "descriptions": [
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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: macb: use the current queue number for stats\n\nThere\u0027s a potential mismatch between the memory reserved for statistics\nand the amount of memory written.\n\ngem_get_sset_count() correctly computes the number of stats based on the\nactive queues, whereas gem_get_ethtool_stats() indiscriminately copies\ndata using the maximum number of queues, and in the case the number of\nactive queues is less than MACB_MAX_QUEUES, this results in a OOB write\nas observed in the KASAN splat.\n\n==================================================================\nBUG: KASAN: vmalloc-out-of-bounds in gem_get_ethtool_stats+0x54/0x78\n  [macb]\nWrite of size 760 at addr ffff80008080b000 by task ethtool/1027\n\nCPU: [...]\nTainted: [E]=UNSIGNED_MODULE\nHardware name: raspberrypi rpi/rpi, BIOS 2025.10 10/01/2025\nCall trace:\n show_stack+0x20/0x38 (C)\n dump_stack_lvl+0x80/0xf8\n print_report+0x384/0x5e0\n kasan_report+0xa0/0xf0\n kasan_check_range+0xe8/0x190\n __asan_memcpy+0x54/0x98\n gem_get_ethtool_stats+0x54/0x78 [macb\n   926c13f3af83b0c6fe64badb21ec87d5e93fcf65]\n dev_ethtool+0x1220/0x38c0\n dev_ioctl+0x4ac/0xca8\n sock_do_ioctl+0x170/0x1d8\n sock_ioctl+0x484/0x5d8\n __arm64_sys_ioctl+0x12c/0x1b8\n invoke_syscall+0xd4/0x258\n el0_svc_common.constprop.0+0xb4/0x240\n do_el0_svc+0x48/0x68\n el0_svc+0x40/0xf8\n el0t_64_sync_handler+0xa0/0xe8\n el0t_64_sync+0x1b0/0x1b8\n\nThe buggy address belongs to a 1-page vmalloc region starting at\n  0xffff80008080b000 allocated at dev_ethtool+0x11f0/0x38c0\nThe buggy address belongs to the physical page:\npage: refcount:1 mapcount:0 mapping:0000000000000000\n  index:0xffff00000a333000 pfn:0xa333\nflags: 0x7fffc000000000(node=0|zone=0|lastcpupid=0x1ffff)\nraw: 007fffc000000000 0000000000000000 dead000000000122 0000000000000000\nraw: ffff00000a333000 0000000000000000 00000001ffffffff 0000000000000000\npage dumped because: kasan: bad access detected\n\nMemory state around the buggy address:\n ffff80008080b080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n ffff80008080b100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n\u003effff80008080b180: 00 00 00 00 00 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\n                                  ^\n ffff80008080b200: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\n ffff80008080b280: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\n==================================================================\n\nFix it by making sure the copied size only considers the active number of\nqueues."
    }
  ],
  "id": "CVE-2026-31494",
  "lastModified": "2026-04-28T14:44:57.387",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
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        "impactScore": 5.9,
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        "type": "Secondary"
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  "published": "2026-04-22T14:16:47.293",
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  "vulnStatus": "Analyzed",
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          "lang": "en",
          "value": "CWE-787"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
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}


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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
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  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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