CVE-2021-47517 (GCVE-0-2021-47517)

Vulnerability from cvelistv5 – Published: 2024-05-24 15:09 – Updated: 2026-05-11 13:56
VLAI
Title
ethtool: do not perform operations on net devices being unregistered
Summary
In the Linux kernel, the following vulnerability has been resolved: ethtool: do not perform operations on net devices being unregistered There is a short period between a net device starts to be unregistered and when it is actually gone. In that time frame ethtool operations could still be performed, which might end up in unwanted or undefined behaviours[1]. Do not allow ethtool operations after a net device starts its unregistration. This patch targets the netlink part as the ioctl one isn't affected: the reference to the net device is taken and the operation is executed within an rtnl lock section and the net device won't be found after unregister. [1] For example adding Tx queues after unregister ends up in NULL pointer exceptions and UaFs, such as: BUG: KASAN: use-after-free in kobject_get+0x14/0x90 Read of size 1 at addr ffff88801961248c by task ethtool/755 CPU: 0 PID: 755 Comm: ethtool Not tainted 5.15.0-rc6+ #778 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-4.fc34 04/014 Call Trace: dump_stack_lvl+0x57/0x72 print_address_description.constprop.0+0x1f/0x140 kasan_report.cold+0x7f/0x11b kobject_get+0x14/0x90 kobject_add_internal+0x3d1/0x450 kobject_init_and_add+0xba/0xf0 netdev_queue_update_kobjects+0xcf/0x200 netif_set_real_num_tx_queues+0xb4/0x310 veth_set_channels+0x1c3/0x550 ethnl_set_channels+0x524/0x610
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 041b1c5d4a53e97fc9e029ae32469552ca12cb9b , < 7c26da3be1e9843a15b5318f90db8a564479d2ac (git)
Affected: 041b1c5d4a53e97fc9e029ae32469552ca12cb9b , < cfd719f04267108f5f5bf802b9d7de69e99a99f9 (git)
Affected: 041b1c5d4a53e97fc9e029ae32469552ca12cb9b , < dde91ccfa25fd58f64c397d91b81a4b393100ffa (git)
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Linux Linux Affected: 5.6
Unaffected: 0 , < 5.6 (semver)
Unaffected: 5.10.87 , ≤ 5.10.* (semver)
Unaffected: 5.15.8 , ≤ 5.15.* (semver)
Unaffected: 5.16 , ≤ * (original_commit_for_fix)
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This patch targets the netlink part as the ioctl one\\nisn\u0027t affected: the reference to the net device is taken and the\\noperation is executed within an rtnl lock section and the net device\\nwon\u0027t be found after unregister.\\n\\n[1] For example adding Tx queues after unregister ends up in NULL\\n    pointer exceptions and UaFs, such as:\\n\\n      BUG: KASAN: use-after-free in kobject_get+0x14/0x90\\n      Read of size 1 at addr ffff88801961248c by task ethtool/755\\n\\n      CPU: 0 PID: 755 Comm: ethtool Not tainted 5.15.0-rc6+ #778\\n      Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-4.fc34 04/014\\n      Call Trace:\\n       dump_stack_lvl+0x57/0x72\\n       print_address_description.constprop.0+0x1f/0x140\\n       kasan_report.cold+0x7f/0x11b\\n       kobject_get+0x14/0x90\\n       kobject_add_internal+0x3d1/0x450\\n       kobject_init_and_add+0xba/0xf0\\n       netdev_queue_update_kobjects+0xcf/0x200\\n       netif_set_real_num_tx_queues+0xb4/0x310\\n       veth_set_channels+0x1c3/0x550\\n       ethnl_set_channels+0x524/0x610\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.87\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.8\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.16\", \"versionStartIncluding\": \"5.6\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:12:41.633Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47517\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:12:41.633Z\", \"dateReserved\": \"2024-05-24T15:02:54.824Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-24T15:09:30.675Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • 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.


Detection rules are retrieved from Rulezet.