CVE-2023-53798 (GCVE-0-2023-53798)

Vulnerability from cvelistv5 – Published: 2025-12-09 00:00 – Updated: 2025-12-09 00:00
VLAI?
Title
ethtool: Fix uninitialized number of lanes
Summary
In the Linux kernel, the following vulnerability has been resolved: ethtool: Fix uninitialized number of lanes It is not possible to set the number of lanes when setting link modes using the legacy IOCTL ethtool interface. Since 'struct ethtool_link_ksettings' is not initialized in this path, drivers receive an uninitialized number of lanes in 'struct ethtool_link_ksettings::lanes'. When this information is later queried from drivers, it results in the ethtool code making decisions based on uninitialized memory, leading to the following KMSAN splat [1]. In practice, this most likely only happens with the tun driver that simply returns whatever it got in the set operation. As far as I can tell, this uninitialized memory is not leaked to user space thanks to the 'ethtool_ops->cap_link_lanes_supported' check in linkmodes_prepare_data(). Fix by initializing the structure in the IOCTL path. Did not find any more call sites that pass an uninitialized structure when calling 'ethtool_ops::set_link_ksettings()'. [1] BUG: KMSAN: uninit-value in ethnl_update_linkmodes net/ethtool/linkmodes.c:273 [inline] BUG: KMSAN: uninit-value in ethnl_set_linkmodes+0x190b/0x19d0 net/ethtool/linkmodes.c:333 ethnl_update_linkmodes net/ethtool/linkmodes.c:273 [inline] ethnl_set_linkmodes+0x190b/0x19d0 net/ethtool/linkmodes.c:333 ethnl_default_set_doit+0x88d/0xde0 net/ethtool/netlink.c:640 genl_family_rcv_msg_doit net/netlink/genetlink.c:968 [inline] genl_family_rcv_msg net/netlink/genetlink.c:1048 [inline] genl_rcv_msg+0x141a/0x14c0 net/netlink/genetlink.c:1065 netlink_rcv_skb+0x3f8/0x750 net/netlink/af_netlink.c:2577 genl_rcv+0x40/0x60 net/netlink/genetlink.c:1076 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline] netlink_unicast+0xf41/0x1270 net/netlink/af_netlink.c:1365 netlink_sendmsg+0x127d/0x1430 net/netlink/af_netlink.c:1942 sock_sendmsg_nosec net/socket.c:724 [inline] sock_sendmsg net/socket.c:747 [inline] ____sys_sendmsg+0xa24/0xe40 net/socket.c:2501 ___sys_sendmsg+0x2a1/0x3f0 net/socket.c:2555 __sys_sendmsg net/socket.c:2584 [inline] __do_sys_sendmsg net/socket.c:2593 [inline] __se_sys_sendmsg net/socket.c:2591 [inline] __x64_sys_sendmsg+0x36b/0x540 net/socket.c:2591 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Uninit was stored to memory at: tun_get_link_ksettings+0x37/0x60 drivers/net/tun.c:3544 __ethtool_get_link_ksettings+0x17b/0x260 net/ethtool/ioctl.c:441 ethnl_set_linkmodes+0xee/0x19d0 net/ethtool/linkmodes.c:327 ethnl_default_set_doit+0x88d/0xde0 net/ethtool/netlink.c:640 genl_family_rcv_msg_doit net/netlink/genetlink.c:968 [inline] genl_family_rcv_msg net/netlink/genetlink.c:1048 [inline] genl_rcv_msg+0x141a/0x14c0 net/netlink/genetlink.c:1065 netlink_rcv_skb+0x3f8/0x750 net/netlink/af_netlink.c:2577 genl_rcv+0x40/0x60 net/netlink/genetlink.c:1076 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline] netlink_unicast+0xf41/0x1270 net/netlink/af_netlink.c:1365 netlink_sendmsg+0x127d/0x1430 net/netlink/af_netlink.c:1942 sock_sendmsg_nosec net/socket.c:724 [inline] sock_sendmsg net/socket.c:747 [inline] ____sys_sendmsg+0xa24/0xe40 net/socket.c:2501 ___sys_sendmsg+0x2a1/0x3f0 net/socket.c:2555 __sys_sendmsg net/socket.c:2584 [inline] __do_sys_sendmsg net/socket.c:2593 [inline] __se_sys_sendmsg net/socket.c:2591 [inline] __x64_sys_sendmsg+0x36b/0x540 net/socket.c:2591 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Uninit was stored to memory at: tun_set_link_ksettings+0x37/0x60 drivers/net/tun.c:3553 ethtool_set_link_ksettings+0x600/0x690 net/ethtool/ioctl.c:609 __dev_ethtool net/ethtool/ioctl.c:3024 [inline] dev_ethtool+0x1db9/0x2a70 net/ethtool/ioctl.c:3078 dev_ioctl+0xb07/0x1270 net/core/dev_ioctl.c:524 sock_do_ioctl+0x295/0x540 net/socket.c:1213 sock_i ---truncated---
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 012ce4dd3102a0f4d80167de343e9d44b257c1b8 , < da81af0ef8092ecacd87fac3229c29e2e0ce39fd (git)
Affected: 012ce4dd3102a0f4d80167de343e9d44b257c1b8 , < 942a2a0184f7bb1c1ae4bbc556559c86c054b0d2 (git)
Affected: 012ce4dd3102a0f4d80167de343e9d44b257c1b8 , < 6456d80045d6de47734b1a3879c91f72af186529 (git)
Affected: 012ce4dd3102a0f4d80167de343e9d44b257c1b8 , < 72808c4ab5fd01bf1214195005e15b434bf55cef (git)
Affected: 012ce4dd3102a0f4d80167de343e9d44b257c1b8 , < 9ad685dbfe7e856bbf17a7177b64676d324d6ed7 (git)
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    Linux Linux Affected: 5.12
Unaffected: 0 , < 5.12 (semver)
Unaffected: 5.15.112 , ≤ 5.15.* (semver)
Unaffected: 6.1.29 , ≤ 6.1.* (semver)
Unaffected: 6.2.16 , ≤ 6.2.* (semver)
Unaffected: 6.3.3 , ≤ 6.3.* (semver)
Unaffected: 6.4 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ethtool/ioctl.c"
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          "vendor": "Linux",
          "versions": [
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              "status": "unaffected",
              "version": "6.2.16",
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            },
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              "lessThanOrEqual": "6.3.*",
              "status": "unaffected",
              "version": "6.3.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.4",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.112",
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                  "vulnerable": true
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nethtool: Fix uninitialized number of lanes\n\nIt is not possible to set the number of lanes when setting link modes\nusing the legacy IOCTL ethtool interface. Since \u0027struct\nethtool_link_ksettings\u0027 is not initialized in this path, drivers receive\nan uninitialized number of lanes in \u0027struct\nethtool_link_ksettings::lanes\u0027.\n\nWhen this information is later queried from drivers, it results in the\nethtool code making decisions based on uninitialized memory, leading to\nthe following KMSAN splat [1]. In practice, this most likely only\nhappens with the tun driver that simply returns whatever it got in the\nset operation.\n\nAs far as I can tell, this uninitialized memory is not leaked to user\nspace thanks to the \u0027ethtool_ops-\u003ecap_link_lanes_supported\u0027 check in\nlinkmodes_prepare_data().\n\nFix by initializing the structure in the IOCTL path. Did not find any\nmore call sites that pass an uninitialized structure when calling\n\u0027ethtool_ops::set_link_ksettings()\u0027.\n\n[1]\nBUG: KMSAN: uninit-value in ethnl_update_linkmodes net/ethtool/linkmodes.c:273 [inline]\nBUG: KMSAN: uninit-value in ethnl_set_linkmodes+0x190b/0x19d0 net/ethtool/linkmodes.c:333\n ethnl_update_linkmodes net/ethtool/linkmodes.c:273 [inline]\n ethnl_set_linkmodes+0x190b/0x19d0 net/ethtool/linkmodes.c:333\n ethnl_default_set_doit+0x88d/0xde0 net/ethtool/netlink.c:640\n genl_family_rcv_msg_doit net/netlink/genetlink.c:968 [inline]\n genl_family_rcv_msg net/netlink/genetlink.c:1048 [inline]\n genl_rcv_msg+0x141a/0x14c0 net/netlink/genetlink.c:1065\n netlink_rcv_skb+0x3f8/0x750 net/netlink/af_netlink.c:2577\n genl_rcv+0x40/0x60 net/netlink/genetlink.c:1076\n netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline]\n netlink_unicast+0xf41/0x1270 net/netlink/af_netlink.c:1365\n netlink_sendmsg+0x127d/0x1430 net/netlink/af_netlink.c:1942\n sock_sendmsg_nosec net/socket.c:724 [inline]\n sock_sendmsg net/socket.c:747 [inline]\n ____sys_sendmsg+0xa24/0xe40 net/socket.c:2501\n ___sys_sendmsg+0x2a1/0x3f0 net/socket.c:2555\n __sys_sendmsg net/socket.c:2584 [inline]\n __do_sys_sendmsg net/socket.c:2593 [inline]\n __se_sys_sendmsg net/socket.c:2591 [inline]\n __x64_sys_sendmsg+0x36b/0x540 net/socket.c:2591\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nUninit was stored to memory at:\n tun_get_link_ksettings+0x37/0x60 drivers/net/tun.c:3544\n __ethtool_get_link_ksettings+0x17b/0x260 net/ethtool/ioctl.c:441\n ethnl_set_linkmodes+0xee/0x19d0 net/ethtool/linkmodes.c:327\n ethnl_default_set_doit+0x88d/0xde0 net/ethtool/netlink.c:640\n genl_family_rcv_msg_doit net/netlink/genetlink.c:968 [inline]\n genl_family_rcv_msg net/netlink/genetlink.c:1048 [inline]\n genl_rcv_msg+0x141a/0x14c0 net/netlink/genetlink.c:1065\n netlink_rcv_skb+0x3f8/0x750 net/netlink/af_netlink.c:2577\n genl_rcv+0x40/0x60 net/netlink/genetlink.c:1076\n netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline]\n netlink_unicast+0xf41/0x1270 net/netlink/af_netlink.c:1365\n netlink_sendmsg+0x127d/0x1430 net/netlink/af_netlink.c:1942\n sock_sendmsg_nosec net/socket.c:724 [inline]\n sock_sendmsg net/socket.c:747 [inline]\n ____sys_sendmsg+0xa24/0xe40 net/socket.c:2501\n ___sys_sendmsg+0x2a1/0x3f0 net/socket.c:2555\n __sys_sendmsg net/socket.c:2584 [inline]\n __do_sys_sendmsg net/socket.c:2593 [inline]\n __se_sys_sendmsg net/socket.c:2591 [inline]\n __x64_sys_sendmsg+0x36b/0x540 net/socket.c:2591\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nUninit was stored to memory at:\n tun_set_link_ksettings+0x37/0x60 drivers/net/tun.c:3553\n ethtool_set_link_ksettings+0x600/0x690 net/ethtool/ioctl.c:609\n __dev_ethtool net/ethtool/ioctl.c:3024 [inline]\n dev_ethtool+0x1db9/0x2a70 net/ethtool/ioctl.c:3078\n dev_ioctl+0xb07/0x1270 net/core/dev_ioctl.c:524\n sock_do_ioctl+0x295/0x540 net/socket.c:1213\n sock_i\n---truncated---"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-09T00:00:54.769Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/da81af0ef8092ecacd87fac3229c29e2e0ce39fd"
        },
        {
          "url": "https://git.kernel.org/stable/c/942a2a0184f7bb1c1ae4bbc556559c86c054b0d2"
        },
        {
          "url": "https://git.kernel.org/stable/c/6456d80045d6de47734b1a3879c91f72af186529"
        },
        {
          "url": "https://git.kernel.org/stable/c/72808c4ab5fd01bf1214195005e15b434bf55cef"
        },
        {
          "url": "https://git.kernel.org/stable/c/9ad685dbfe7e856bbf17a7177b64676d324d6ed7"
        }
      ],
      "title": "ethtool: Fix uninitialized number of lanes",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53798",
    "datePublished": "2025-12-09T00:00:54.769Z",
    "dateReserved": "2025-12-08T23:58:35.275Z",
    "dateUpdated": "2025-12-09T00:00:54.769Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-53798\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-09T01:16:51.470\",\"lastModified\":\"2025-12-09T18:37:13.640\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nethtool: Fix uninitialized number of lanes\\n\\nIt is not possible to set the number of lanes when setting link modes\\nusing the legacy IOCTL ethtool interface. Since \u0027struct\\nethtool_link_ksettings\u0027 is not initialized in this path, drivers receive\\nan uninitialized number of lanes in \u0027struct\\nethtool_link_ksettings::lanes\u0027.\\n\\nWhen this information is later queried from drivers, it results in the\\nethtool code making decisions based on uninitialized memory, leading to\\nthe following KMSAN splat [1]. In practice, this most likely only\\nhappens with the tun driver that simply returns whatever it got in the\\nset operation.\\n\\nAs far as I can tell, this uninitialized memory is not leaked to user\\nspace thanks to the \u0027ethtool_ops-\u003ecap_link_lanes_supported\u0027 check in\\nlinkmodes_prepare_data().\\n\\nFix by initializing the structure in the IOCTL path. Did not find any\\nmore call sites that pass an uninitialized structure when calling\\n\u0027ethtool_ops::set_link_ksettings()\u0027.\\n\\n[1]\\nBUG: KMSAN: uninit-value in ethnl_update_linkmodes net/ethtool/linkmodes.c:273 [inline]\\nBUG: KMSAN: uninit-value in ethnl_set_linkmodes+0x190b/0x19d0 net/ethtool/linkmodes.c:333\\n ethnl_update_linkmodes net/ethtool/linkmodes.c:273 [inline]\\n ethnl_set_linkmodes+0x190b/0x19d0 net/ethtool/linkmodes.c:333\\n ethnl_default_set_doit+0x88d/0xde0 net/ethtool/netlink.c:640\\n genl_family_rcv_msg_doit net/netlink/genetlink.c:968 [inline]\\n genl_family_rcv_msg net/netlink/genetlink.c:1048 [inline]\\n genl_rcv_msg+0x141a/0x14c0 net/netlink/genetlink.c:1065\\n netlink_rcv_skb+0x3f8/0x750 net/netlink/af_netlink.c:2577\\n genl_rcv+0x40/0x60 net/netlink/genetlink.c:1076\\n netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline]\\n netlink_unicast+0xf41/0x1270 net/netlink/af_netlink.c:1365\\n netlink_sendmsg+0x127d/0x1430 net/netlink/af_netlink.c:1942\\n sock_sendmsg_nosec net/socket.c:724 [inline]\\n sock_sendmsg net/socket.c:747 [inline]\\n ____sys_sendmsg+0xa24/0xe40 net/socket.c:2501\\n ___sys_sendmsg+0x2a1/0x3f0 net/socket.c:2555\\n __sys_sendmsg net/socket.c:2584 [inline]\\n __do_sys_sendmsg net/socket.c:2593 [inline]\\n __se_sys_sendmsg net/socket.c:2591 [inline]\\n __x64_sys_sendmsg+0x36b/0x540 net/socket.c:2591\\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\\n do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80\\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\\n\\nUninit was stored to memory at:\\n tun_get_link_ksettings+0x37/0x60 drivers/net/tun.c:3544\\n __ethtool_get_link_ksettings+0x17b/0x260 net/ethtool/ioctl.c:441\\n ethnl_set_linkmodes+0xee/0x19d0 net/ethtool/linkmodes.c:327\\n ethnl_default_set_doit+0x88d/0xde0 net/ethtool/netlink.c:640\\n genl_family_rcv_msg_doit net/netlink/genetlink.c:968 [inline]\\n genl_family_rcv_msg net/netlink/genetlink.c:1048 [inline]\\n genl_rcv_msg+0x141a/0x14c0 net/netlink/genetlink.c:1065\\n netlink_rcv_skb+0x3f8/0x750 net/netlink/af_netlink.c:2577\\n genl_rcv+0x40/0x60 net/netlink/genetlink.c:1076\\n netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline]\\n netlink_unicast+0xf41/0x1270 net/netlink/af_netlink.c:1365\\n netlink_sendmsg+0x127d/0x1430 net/netlink/af_netlink.c:1942\\n sock_sendmsg_nosec net/socket.c:724 [inline]\\n sock_sendmsg net/socket.c:747 [inline]\\n ____sys_sendmsg+0xa24/0xe40 net/socket.c:2501\\n ___sys_sendmsg+0x2a1/0x3f0 net/socket.c:2555\\n __sys_sendmsg net/socket.c:2584 [inline]\\n __do_sys_sendmsg net/socket.c:2593 [inline]\\n __se_sys_sendmsg net/socket.c:2591 [inline]\\n __x64_sys_sendmsg+0x36b/0x540 net/socket.c:2591\\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\\n do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80\\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\\n\\nUninit was stored to memory at:\\n tun_set_link_ksettings+0x37/0x60 drivers/net/tun.c:3553\\n ethtool_set_link_ksettings+0x600/0x690 net/ethtool/ioctl.c:609\\n __dev_ethtool net/ethtool/ioctl.c:3024 [inline]\\n dev_ethtool+0x1db9/0x2a70 net/ethtool/ioctl.c:3078\\n dev_ioctl+0xb07/0x1270 net/core/dev_ioctl.c:524\\n sock_do_ioctl+0x295/0x540 net/socket.c:1213\\n sock_i\\n---truncated---\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/6456d80045d6de47734b1a3879c91f72af186529\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/72808c4ab5fd01bf1214195005e15b434bf55cef\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/942a2a0184f7bb1c1ae4bbc556559c86c054b0d2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9ad685dbfe7e856bbf17a7177b64676d324d6ed7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/da81af0ef8092ecacd87fac3229c29e2e0ce39fd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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Sightings

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  • 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.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.