CVE-2026-52975
Estado: AnalizadaAlta (7.8)—
In the Linux kernel, the following vulnerability has been resolved:
bonding: 3ad: implement proper RCU rules for port->aggregator
syzbot found a data-race in bond_3ad_get_active_agg_info / bond_3ad_state_machine_handler [1] which hints at lack of proper RCU implementation.
Add __rcu qualifier to port->aggregator, and add proper RCU API.
[1]
value changed: 0x0000000000000000 -> 0xffff88813cf5c400
Detalles técnicos trazas, registros y código del informe original
BUG: KCSAN: data-race in bond_3ad_get_active_agg_info / bond_3ad_state_machine_handler write to 0xffff88813cf5c4b0 of 8 bytes by task 36 on cpu 0: ad_port_selection_logic drivers/net/bonding/bond_3ad.c:1659 [inline] bond_3ad_state_machine_handler+0x9d5/0x2d60 drivers/net/bonding/bond_3ad.c:2569 process_one_work kernel/workqueue.c:3302 [inline] process_scheduled_works+0x4f0/0x9c0 kernel/workqueue.c:3385 worker_thread+0x58a/0x780 kernel/workqueue.c:3466 kthread+0x22a/0x280 kernel/kthread.c:436 ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 read to 0xffff88813cf5c4b0 of 8 bytes by task 22063 on cpu 1: __bond_3ad_get_active_agg_info drivers/net/bonding/bond_3ad.c:2858 [inline] bond_3ad_get_active_agg_info+0x8c/0x230 drivers/net/bonding/bond_3ad.c:2881 bond_fill_info+0xe0f/0x10f0 drivers/net/bonding/bond_netlink.c:853 rtnl_link_info_fill net/core/rtnetlink.c:906 [inline] rtnl_link_fill+0x1d7/0x4e0 net/core/rtnetlink.c:927 rtnl_fill_ifinfo+0xf8e/0x1380 net/core/rtnetlink.c:2168 rtmsg_ifinfo_build_skb+0x11c/0x1b0 net/core/rtnetlink.c:4453 rtmsg_ifinfo_event net/core/rtnetlink.c:4486 [inline] rtmsg_ifinfo+0x6d/0x110 net/core/rtnetlink.c:4495 __dev_notify_flags+0x76/0x390 net/core/dev.c:9790 netif_change_flags+0xac/0xd0 net/core/dev.c:9823 do_setlink+0x905/0x2950 net/core/rtnetlink.c:3180 rtnl_group_changelink net/core/rtnetlink.c:3813 [inline] __rtnl_newlink net/core/rtnetlink.c:3981 [inline] rtnl_newlink+0xf55/0x1400 net/core/rtnetlink.c:4109 rtnetlink_rcv_msg+0x64b/0x720 net/core/rtnetlink.c:6995 netlink_rcv_skb+0x123/0x220 net/netlink/af_netlink.c:2550 rtnetlink_rcv+0x1c/0x30 net/core/rtnetlink.c:7022 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x5a8/0x680 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x5c8/0x6f0 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:787 [inline] __sock_sendmsg net/socket.c:802 [inline] ____sys_sendmsg+0x563/0x5b0 net/socket.c:2698 ___sys_sendmsg+0x195/0x1e0 net/socket.c:2752 __sys_sendmsg net/socket.c:2784 [inline] __do_sys_sendmsg net/socket.c:2789 [inline] __se_sys_sendmsg net/socket.c:2787 [inline] __x64_sys_sendmsg+0xd4/0x160 net/socket.c:2787 x64_sys_call+0x194c/0x3020 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 22063 Comm: syz.0.31122 Tainted: G W syzkaller #0 PREEMPT(full) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Puntuación base: 7.8
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.18%
- Percentil entre todas las CVEs puntuadas: 6
- Fecha de la puntuación: 3/10/2026
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).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1068Exploitation for Privilege Escalationprivilege escalation75 % - Impacto principal
T1499.004Application or System Exploitationimpact60 %
Acceso local con privilegios (PR:L) + impacto alto en disponibilidad (A:H). La race condition en RCU del kernel permite que un usuario local cause negación de servicio o corrupción de estado.
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (1)
CWE
- NVD-CWE-noinfo
Referencias
- https://git.kernel.org/stable/c/3b7265b3a82f40d2357c4004b26eb794a095b186
- https://git.kernel.org/stable/c/5fb9ea4e8ebf514d92df2b6c9d0db25ba02ac735
- https://git.kernel.org/stable/c/78f409fd34fe9de2b24ad8e9dca1b4608a48ed3d
- https://git.kernel.org/stable/c/ba2272be04f0cb1e74e1e355ff32ef95df280731
- https://git.kernel.org/stable/c/c169c5837525ad842df6a542facf52b6f866a519
- https://git.kernel.org/stable/c/c4f050ce06c56cfb5993268af4a5cb66ed1cd04e
JSON original (NVD)
Mostrar
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"version": "3.1",
"baseScore": 7.8,
"attackVector": "LOCAL",
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"integrityImpact": "HIGH",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
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"drivers/net/bonding/bond_main.c",
"drivers/net/bonding/bond_netlink.c",
"drivers/net/bonding/bond_procfs.c",
"drivers/net/bonding/bond_sysfs_slave.c",
"include/net/bond_3ad.h"
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"published": "2026-06-24T17:17:08.050",
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"vulnStatus": "Analyzed",
"weaknesses": [
{
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"source": "nvd@nist.gov",
"description": [
{
"lang": "en",
"value": "NVD-CWE-noinfo"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbonding: 3ad: implement proper RCU rules for port->aggregator\n\nsyzbot found a data-race in bond_3ad_get_active_agg_info /\nbond_3ad_state_machine_handler [1] which hints at lack of proper\nRCU implementation.\n\nAdd __rcu qualifier to port->aggregator, and add proper RCU API.\n\n[1]\n\nBUG: KCSAN: data-race in bond_3ad_get_active_agg_info / bond_3ad_state_machine_handler\n\nwrite to 0xffff88813cf5c4b0 of 8 bytes by task 36 on cpu 0:\n ad_port_selection_logic drivers/net/bonding/bond_3ad.c:1659 [inline]\n bond_3ad_state_machine_handler+0x9d5/0x2d60 drivers/net/bonding/bond_3ad.c:2569\n process_one_work kernel/workqueue.c:3302 [inline]\n process_scheduled_works+0x4f0/0x9c0 kernel/workqueue.c:3385\n worker_thread+0x58a/0x780 kernel/workqueue.c:3466\n kthread+0x22a/0x280 kernel/kthread.c:436\n ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245\n\nread to 0xffff88813cf5c4b0 of 8 bytes by task 22063 on cpu 1:\n __bond_3ad_get_active_agg_info drivers/net/bonding/bond_3ad.c:2858 [inline]\n bond_3ad_get_active_agg_info+0x8c/0x230 drivers/net/bonding/bond_3ad.c:2881\n bond_fill_info+0xe0f/0x10f0 drivers/net/bonding/bond_netlink.c:853\n rtnl_link_info_fill net/core/rtnetlink.c:906 [inline]\n rtnl_link_fill+0x1d7/0x4e0 net/core/rtnetlink.c:927\n rtnl_fill_ifinfo+0xf8e/0x1380 net/core/rtnetlink.c:2168\n rtmsg_ifinfo_build_skb+0x11c/0x1b0 net/core/rtnetlink.c:4453\n rtmsg_ifinfo_event net/core/rtnetlink.c:4486 [inline]\n rtmsg_ifinfo+0x6d/0x110 net/core/rtnetlink.c:4495\n __dev_notify_flags+0x76/0x390 net/core/dev.c:9790\n netif_change_flags+0xac/0xd0 net/core/dev.c:9823\n do_setlink+0x905/0x2950 net/core/rtnetlink.c:3180\n rtnl_group_changelink net/core/rtnetlink.c:3813 [inline]\n __rtnl_newlink net/core/rtnetlink.c:3981 [inline]\n rtnl_newlink+0xf55/0x1400 net/core/rtnetlink.c:4109\n rtnetlink_rcv_msg+0x64b/0x720 net/core/rtnetlink.c:6995\n netlink_rcv_skb+0x123/0x220 net/netlink/af_netlink.c:2550\n rtnetlink_rcv+0x1c/0x30 net/core/rtnetlink.c:7022\n netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]\n netlink_unicast+0x5a8/0x680 net/netlink/af_netlink.c:1344\n netlink_sendmsg+0x5c8/0x6f0 net/netlink/af_netlink.c:1894\n sock_sendmsg_nosec net/socket.c:787 [inline]\n __sock_sendmsg net/socket.c:802 [inline]\n ____sys_sendmsg+0x563/0x5b0 net/socket.c:2698\n ___sys_sendmsg+0x195/0x1e0 net/socket.c:2752\n __sys_sendmsg net/socket.c:2784 [inline]\n __do_sys_sendmsg net/socket.c:2789 [inline]\n __se_sys_sendmsg net/socket.c:2787 [inline]\n __x64_sys_sendmsg+0xd4/0x160 net/socket.c:2787\n x64_sys_call+0x194c/0x3020 arch/x86/include/generated/asm/syscalls_64.h:47\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nvalue changed: 0x0000000000000000 -> 0xffff88813cf5c400\n\nReported by Kernel Concurrency Sanitizer on:\nCPU: 1 UID: 0 PID: 22063 Comm: syz.0.31122 Tainted: G W syzkaller #0 PREEMPT(full)\nTainted: [W]=WARN\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026"
}
],
"lastModified": "2026-07-14T16:52:32.697",
"configurations": [
{
"nodes": [
{
"negate": false,
"cpeMatch": [
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"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}