CVE-2026-31396
Estado: ModificadaAlta (7.8)—
In the Linux kernel, the following vulnerability has been resolved:
net: macb: fix use-after-free access to PTP clock
PTP clock is registered on every opening of the interface and destroyed on every closing. However it may be accessed via get_ts_info ethtool call which is possible while the interface is just present in the kernel.
Detalles técnicos trazas, registros y código del informe original
BUG: KASAN: use-after-free in ptp_clock_index+0x47/0x50 drivers/ptp/ptp_clock.c:426 Read of size 4 at addr ffff8880194345cc by task syz.0.6/948 CPU: 1 PID: 948 Comm: syz.0.6 Not tainted 6.1.164+ #109 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.1-0-g3208b098f51a-prebuilt.qemu.org 04/01/2014 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x8d/0xba lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0x17f/0x496 mm/kasan/report.c:420 kasan_report+0xd9/0x180 mm/kasan/report.c:524 ptp_clock_index+0x47/0x50 drivers/ptp/ptp_clock.c:426 gem_get_ts_info+0x138/0x1e0 drivers/net/ethernet/cadence/macb_main.c:3349 macb_get_ts_info+0x68/0xb0 drivers/net/ethernet/cadence/macb_main.c:3371 __ethtool_get_ts_info+0x17c/0x260 net/ethtool/common.c:558 ethtool_get_ts_info net/ethtool/ioctl.c:2367 [inline] __dev_ethtool net/ethtool/ioctl.c:3017 [inline] dev_ethtool+0x2b05/0x6290 net/ethtool/ioctl.c:3095 dev_ioctl+0x637/0x1070 net/core/dev_ioctl.c:510 sock_do_ioctl+0x20d/0x2c0 net/socket.c:1215 sock_ioctl+0x577/0x6d0 net/socket.c:1320 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x18c/0x210 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x35/0x80 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x6e/0xd8 </TASK> Allocated by task 457: kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:699 [inline] ptp_clock_register+0x144/0x10e0 drivers/ptp/ptp_clock.c:235 gem_ptp_init+0x46f/0x930 drivers/net/ethernet/cadence/macb_ptp.c:375 macb_open+0x901/0xd10 drivers/net/ethernet/cadence/macb_main.c:2920 __dev_open+0x2ce/0x500 net/core/dev.c:1501 __dev_change_flags+0x56a/0x740 net/core/dev.c:8651 dev_change_flags+0x92/0x170 net/core/dev.c:8722 do_setlink+0xaf8/0x3a80 net/core/rtnetlink.c:2833 __rtnl_newlink+0xbf4/0x1940 net/core/rtnetlink.c:3608 rtnl_newlink+0x63/0xa0 net/core/rtnetlink.c:3655 rtnetlink_rcv_msg+0x3c6/0xed0 net/core/rtnetlink.c:6150 netlink_rcv_skb+0x15d/0x430 net/netlink/af_netlink.c:2511 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x6d7/0xa30 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x97e/0xeb0 net/netlink/af_netlink.c:1872 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg+0x14b/0x180 net/socket.c:730 __sys_sendto+0x320/0x3b0 net/socket.c:2152 __do_sys_sendto net/socket.c:2164 [inline] __se_sys_sendto net/socket.c:2160 [inline] __x64_sys_sendto+0xdc/0x1b0 net/socket.c:2160 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x35/0x80 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x6e/0xd8 Freed by task 938: kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1729 [inline] slab_free_freelist_hook mm/slub.c:1755 [inline] slab_free mm/slub.c:3687 [inline] __kmem_cache_free+0xbc/0x320 mm/slub.c:3700 device_release+0xa0/0x240 drivers/base/core.c:2507 kobject_cleanup lib/kobject.c:681 [inline] kobject_release lib/kobject.c:712 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1cd/0x350 lib/kobject.c:729 put_device+0x1b/0x30 drivers/base/core.c:3805 ptp_clock_unregister+0x171/0x270 drivers/ptp/ptp_clock.c:391 gem_ptp_remove+0x4e/0x1f0 drivers/net/ethernet/cadence/macb_ptp.c:404 macb_close+0x1c8/0x270 drivers/net/ethernet/cadence/macb_main.c:2966 __dev_close_many+0x1b9/0x310 net/core/dev.c:1585 __dev_close net/core/dev.c:1597 [inline] __dev_change_flags+0x2bb/0x740 net/core/dev.c:8649 dev_change_fl ---truncated---
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: 7
- Fecha de la puntuación: 6/10/2026
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 Exploitationimpact70 %
Vulnerabilidad CWE-416 (use-after-free) local (AV:L/PR:L) en kernel Linux que causa DoS mediante acceso a memoria liberada a través de ethtool ioctl; requiere privilegios locales.
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
- CWE-416
Referencias
- https://git.kernel.org/stable/c/0bb848d8c64938024e45780f8032f1f67d3a3607
- https://git.kernel.org/stable/c/1f4714065b2bcbb0a4013fd355b84b848e6cc345
- https://git.kernel.org/stable/c/341d01087f821aa0f165fb1ffc8bfe4e50776da7
- https://git.kernel.org/stable/c/5653af416a48f6c18f9626ae9df96f814f45ff34
- https://git.kernel.org/stable/c/6b757f345eeea87ed5d8afd6de35b927a1a57a2f
- https://git.kernel.org/stable/c/8820ffe0975fd2efbe50453e9179c8e1c33a13d3
- https://git.kernel.org/stable/c/8da13e6d63c1a97f7302d342c89c4a56a55c7015
- https://git.kernel.org/stable/c/eb652535e9ec795ef5c1078f7578eaaed755268b
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
JSON original (NVD)
Mostrar
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"baseScore": 7.8,
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"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",
"privilegesRequired": "LOW",
"confidentialityImpact": "HIGH"
},
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}
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{
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{
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"published": "2026-04-03T16:16:37.887",
"references": [
{
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{
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],
"vulnStatus": "Modified",
"weaknesses": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"description": [
{
"lang": "en",
"value": "CWE-416"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: macb: fix use-after-free access to PTP clock\n\nPTP clock is registered on every opening of the interface and destroyed on\nevery closing. However it may be accessed via get_ts_info ethtool call\nwhich is possible while the interface is just present in the kernel.\n\nBUG: KASAN: use-after-free in ptp_clock_index+0x47/0x50 drivers/ptp/ptp_clock.c:426\nRead of size 4 at addr ffff8880194345cc by task syz.0.6/948\n\nCPU: 1 PID: 948 Comm: syz.0.6 Not tainted 6.1.164+ #109\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.1-0-g3208b098f51a-prebuilt.qemu.org 04/01/2014\nCall Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x8d/0xba lib/dump_stack.c:106\n print_address_description mm/kasan/report.c:316 [inline]\n print_report+0x17f/0x496 mm/kasan/report.c:420\n kasan_report+0xd9/0x180 mm/kasan/report.c:524\n ptp_clock_index+0x47/0x50 drivers/ptp/ptp_clock.c:426\n gem_get_ts_info+0x138/0x1e0 drivers/net/ethernet/cadence/macb_main.c:3349\n macb_get_ts_info+0x68/0xb0 drivers/net/ethernet/cadence/macb_main.c:3371\n __ethtool_get_ts_info+0x17c/0x260 net/ethtool/common.c:558\n ethtool_get_ts_info net/ethtool/ioctl.c:2367 [inline]\n __dev_ethtool net/ethtool/ioctl.c:3017 [inline]\n dev_ethtool+0x2b05/0x6290 net/ethtool/ioctl.c:3095\n dev_ioctl+0x637/0x1070 net/core/dev_ioctl.c:510\n sock_do_ioctl+0x20d/0x2c0 net/socket.c:1215\n sock_ioctl+0x577/0x6d0 net/socket.c:1320\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:870 [inline]\n __se_sys_ioctl fs/ioctl.c:856 [inline]\n __x64_sys_ioctl+0x18c/0x210 fs/ioctl.c:856\n do_syscall_x64 arch/x86/entry/common.c:46 [inline]\n do_syscall_64+0x35/0x80 arch/x86/entry/common.c:76\n entry_SYSCALL_64_after_hwframe+0x6e/0xd8\n </TASK>\n\nAllocated by task 457:\n kmalloc include/linux/slab.h:563 [inline]\n kzalloc include/linux/slab.h:699 [inline]\n ptp_clock_register+0x144/0x10e0 drivers/ptp/ptp_clock.c:235\n gem_ptp_init+0x46f/0x930 drivers/net/ethernet/cadence/macb_ptp.c:375\n macb_open+0x901/0xd10 drivers/net/ethernet/cadence/macb_main.c:2920\n __dev_open+0x2ce/0x500 net/core/dev.c:1501\n __dev_change_flags+0x56a/0x740 net/core/dev.c:8651\n dev_change_flags+0x92/0x170 net/core/dev.c:8722\n do_setlink+0xaf8/0x3a80 net/core/rtnetlink.c:2833\n __rtnl_newlink+0xbf4/0x1940 net/core/rtnetlink.c:3608\n rtnl_newlink+0x63/0xa0 net/core/rtnetlink.c:3655\n rtnetlink_rcv_msg+0x3c6/0xed0 net/core/rtnetlink.c:6150\n netlink_rcv_skb+0x15d/0x430 net/netlink/af_netlink.c:2511\n netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]\n netlink_unicast+0x6d7/0xa30 net/netlink/af_netlink.c:1344\n netlink_sendmsg+0x97e/0xeb0 net/netlink/af_netlink.c:1872\n sock_sendmsg_nosec net/socket.c:718 [inline]\n __sock_sendmsg+0x14b/0x180 net/socket.c:730\n __sys_sendto+0x320/0x3b0 net/socket.c:2152\n __do_sys_sendto net/socket.c:2164 [inline]\n __se_sys_sendto net/socket.c:2160 [inline]\n __x64_sys_sendto+0xdc/0x1b0 net/socket.c:2160\n do_syscall_x64 arch/x86/entry/common.c:46 [inline]\n do_syscall_64+0x35/0x80 arch/x86/entry/common.c:76\n entry_SYSCALL_64_after_hwframe+0x6e/0xd8\n\nFreed by task 938:\n kasan_slab_free include/linux/kasan.h:177 [inline]\n slab_free_hook mm/slub.c:1729 [inline]\n slab_free_freelist_hook mm/slub.c:1755 [inline]\n slab_free mm/slub.c:3687 [inline]\n __kmem_cache_free+0xbc/0x320 mm/slub.c:3700\n device_release+0xa0/0x240 drivers/base/core.c:2507\n kobject_cleanup lib/kobject.c:681 [inline]\n kobject_release lib/kobject.c:712 [inline]\n kref_put include/linux/kref.h:65 [inline]\n kobject_put+0x1cd/0x350 lib/kobject.c:729\n put_device+0x1b/0x30 drivers/base/core.c:3805\n ptp_clock_unregister+0x171/0x270 drivers/ptp/ptp_clock.c:391\n gem_ptp_remove+0x4e/0x1f0 drivers/net/ethernet/cadence/macb_ptp.c:404\n macb_close+0x1c8/0x270 drivers/net/ethernet/cadence/macb_main.c:2966\n __dev_close_many+0x1b9/0x310 net/core/dev.c:1585\n __dev_close net/core/dev.c:1597 [inline]\n __dev_change_flags+0x2bb/0x740 net/core/dev.c:8649\n dev_change_fl\n---truncated---"
}
],
"lastModified": "2026-07-14T13:18:37.750",
"configurations": [
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