{
  "cveId": "CVE-2026-31396",
  "url": "https://patchblox.com/security/cve/CVE-2026-31396",
  "summary": "CVE-2026-31396 is fixed in 51 products on 1 platform, first by DEBIAN-CVE-2026-31396, released April 3, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  net: macb: fix use-after-free access to PTP cloc...",
  "description": "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.  BUG: KASAN: use-after-free in ptp_clock_index\u002B0x47/0x50 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\u002B #109 Hardware name: QEMU Standard PC (Q35 \u002B ICH9, 2009), BIOS rel-1.16.1-0-g3208b098f51a-prebuilt.qemu.org 04/01/2014 Call Trace:  \u003CTASK\u003E  __dump_stack lib/dump_stack.c:88 [inline]  dump_stack_lvl\u002B0x8d/0xba lib/dump_stack.c:106  print_address_description mm/kasan/report.c:316 [inline]  print_report\u002B0x17f/0x496 mm/kasan/report.c:420  kasan_report\u002B0xd9/0x180 mm/kasan/report.c:524  ptp_clock_index\u002B0x47/0x50 drivers/ptp/ptp_clock.c:426  gem_get_ts_info\u002B0x138/0x1e0 drivers/net/ethernet/cadence/macb_main.c:3349  macb_get_ts_info\u002B0x68/0xb0 drivers/net/ethernet/cadence/macb_main.c:3371  __ethtool_get_ts_info\u002B0x17c/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\u002B0x2b05/0x6290 net/ethtool/ioctl.c:3095  dev_ioctl\u002B0x637/0x1070 net/core/dev_ioctl.c:510  sock_do_ioctl\u002B0x20d/0x2c0 net/socket.c:1215  sock_ioctl\u002B0x577/0x6d0 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\u002B0x18c/0x210 fs/ioctl.c:856  do_syscall_x64 arch/x86/entry/common.c:46 [inline]  do_syscall_64\u002B0x35/0x80 arch/x86/entry/common.c:76  entry_SYSCALL_64_after_hwframe\u002B0x6e/0xd8  \u003C/TASK\u003E  Allocated by task 457:  kmalloc include/linux/slab.h:563 [inline]  kzalloc include/linux/slab.h:699 [inline]  ptp_clock_register\u002B0x144/0x10e0 drivers/ptp/ptp_clock.c:235  gem_ptp_init\u002B0x46f/0x930 drivers/net/ethernet/cadence/macb_ptp.c:375  macb_open\u002B0x901/0xd10 drivers/net/ethernet/cadence/macb_main.c:2920  __dev_open\u002B0x2ce/0x500 net/core/dev.c:1501  __dev_change_flags\u002B0x56a/0x740 net/core/dev.c:8651  dev_change_flags\u002B0x92/0x170 net/core/dev.c:8722  do_setlink\u002B0xaf8/0x3a80 net/core/rtnetlink.c:2833  __rtnl_newlink\u002B0xbf4/0x1940 net/core/rtnetlink.c:3608  rtnl_newlink\u002B0x63/0xa0 net/core/rtnetlink.c:3655  rtnetlink_rcv_msg\u002B0x3c6/0xed0 net/core/rtnetlink.c:6150  netlink_rcv_skb\u002B0x15d/0x430 net/netlink/af_netlink.c:2511  netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]  netlink_unicast\u002B0x6d7/0xa30 net/netlink/af_netlink.c:1344  netlink_sendmsg\u002B0x97e/0xeb0 net/netlink/af_netlink.c:1872  sock_sendmsg_nosec net/socket.c:718 [inline]  __sock_sendmsg\u002B0x14b/0x180 net/socket.c:730  __sys_sendto\u002B0x320/0x3b0 net/socket.c:2152  __do_sys_sendto net/socket.c:2164 [inline]  __se_sys_sendto net/socket.c:2160 [inline]  __x64_sys_sendto\u002B0xdc/0x1b0 net/socket.c:2160  do_syscall_x64 arch/x86/entry/common.c:46 [inline]  do_syscall_64\u002B0x35/0x80 arch/x86/entry/common.c:76  entry_SYSCALL_64_after_hwframe\u002B0x6e/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\u002B0xbc/0x320 mm/slub.c:3700  device_release\u002B0xa0/0x240 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\u002B0x1cd/0x350 lib/kobject.c:729  put_device\u002B0x1b/0x30 drivers/base/core.c:3805  ptp_clock_unregister\u002B0x171/0x270 drivers/ptp/ptp_clock.c:391  gem_ptp_remove\u002B0x4e/0x1f0 drivers/net/ethernet/cadence/macb_ptp.c:404  macb_close\u002B0x1c8/0x270 drivers/net/ethernet/cadence/macb_main.c:2966  __dev_close_many\u002B0x1b9/0x310 net/core/dev.c:1585  __dev_close net/core/dev.c:1597 [inline]  __dev_change_flags\u002B0x2bb/0x740 net/core/dev.c:8649  dev_change_fl ---truncated---",
  "published": "2026-04-03T16:16:37Z",
  "severity": "high",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00127,
  "epssPercentile": 0.02396,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
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