CVE-2023-53798
Estado: AplazadaSin puntuar—
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.
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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()'.
Detalles técnicos trazas, registros y código del informe original
[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---
CVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.20%
- Percentil entre todas las CVEs puntuadas: 9
- Fecha de la puntuación: 5/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
- https://git.kernel.org/stable/c/6456d80045d6de47734b1a3879c91f72af186529
- https://git.kernel.org/stable/c/72808c4ab5fd01bf1214195005e15b434bf55cef
- https://git.kernel.org/stable/c/942a2a0184f7bb1c1ae4bbc556559c86c054b0d2
- https://git.kernel.org/stable/c/9ad685dbfe7e856bbf17a7177b64676d324d6ed7
- https://git.kernel.org/stable/c/da81af0ef8092ecacd87fac3229c29e2e0ce39fd
JSON original (NVD)
Mostrar
{
"id": "CVE-2023-53798",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "012ce4dd3102a0f4d80167de343e9d44b257c1b8",
"lessThan": "da81af0ef8092ecacd87fac3229c29e2e0ce39fd",
"versionType": "git"
},
{
"status": "affected",
"version": "012ce4dd3102a0f4d80167de343e9d44b257c1b8",
"lessThan": "942a2a0184f7bb1c1ae4bbc556559c86c054b0d2",
"versionType": "git"
},
{
"status": "affected",
"version": "012ce4dd3102a0f4d80167de343e9d44b257c1b8",
"lessThan": "6456d80045d6de47734b1a3879c91f72af186529",
"versionType": "git"
},
{
"status": "affected",
"version": "012ce4dd3102a0f4d80167de343e9d44b257c1b8",
"lessThan": "72808c4ab5fd01bf1214195005e15b434bf55cef",
"versionType": "git"
},
{
"status": "affected",
"version": "012ce4dd3102a0f4d80167de343e9d44b257c1b8",
"lessThan": "9ad685dbfe7e856bbf17a7177b64676d324d6ed7",
"versionType": "git"
}
],
"programFiles": [
"net/ethtool/ioctl.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.12"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.12",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.15.112",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.29",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.2.16",
"versionType": "semver",
"lessThanOrEqual": "6.2.*"
},
{
"status": "unaffected",
"version": "6.3.3",
"versionType": "semver",
"lessThanOrEqual": "6.3.*"
},
{
"status": "unaffected",
"version": "6.4",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/ethtool/ioctl.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2025-12-09T01:16:51.470",
"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"
}
],
"vulnStatus": "Deferred",
"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 'struct\nethtool_link_ksettings' is not initialized in this path, drivers receive\nan uninitialized number of lanes in 'struct\nethtool_link_ksettings::lanes'.\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 'ethtool_ops->cap_link_lanes_supported' 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'ethtool_ops::set_link_ksettings()'.\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---"
}
],
"lastModified": "2026-06-17T06:46:05.517",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}