CVE-2026-31396 (GCVE-0-2026-31396)

Vulnerability from cvelistv5 – Published: 2026-04-03 15:16 – Updated: 2026-04-03 15:16
VLAI?
Title
net: macb: fix use-after-free access to PTP clock
Summary
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+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---
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: c2594d804d5c8033861d44840673d852d98508c1 , < 341d01087f821aa0f165fb1ffc8bfe4e50776da7 (git)
Affected: c2594d804d5c8033861d44840673d852d98508c1 , < 5653af416a48f6c18f9626ae9df96f814f45ff34 (git)
Affected: c2594d804d5c8033861d44840673d852d98508c1 , < 0bb848d8c64938024e45780f8032f1f67d3a3607 (git)
Affected: c2594d804d5c8033861d44840673d852d98508c1 , < 1f4714065b2bcbb0a4013fd355b84b848e6cc345 (git)
Affected: c2594d804d5c8033861d44840673d852d98508c1 , < eb652535e9ec795ef5c1078f7578eaaed755268b (git)
Affected: c2594d804d5c8033861d44840673d852d98508c1 , < 8da13e6d63c1a97f7302d342c89c4a56a55c7015 (git)
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    Linux Linux Affected: 4.11
Unaffected: 0 , < 4.11 (semver)
Unaffected: 6.1.167 , ≤ 6.1.* (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.78 , ≤ 6.12.* (semver)
Unaffected: 6.18.20 , ≤ 6.18.* (semver)
Unaffected: 6.19.10 , ≤ 6.19.* (semver)
Unaffected: 7.0-rc5 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/cadence/macb_ptp.c"
          ],
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          "vendor": "Linux",
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.12.78",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.18.20",
              "versionType": "semver"
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              "version": "6.19.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0-rc5",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.167",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "6.6.130",
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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\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 \u003cTASK\u003e\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 \u003c/TASK\u003e\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---"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-03T15:16:00.579Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/341d01087f821aa0f165fb1ffc8bfe4e50776da7"
        },
        {
          "url": "https://git.kernel.org/stable/c/5653af416a48f6c18f9626ae9df96f814f45ff34"
        },
        {
          "url": "https://git.kernel.org/stable/c/0bb848d8c64938024e45780f8032f1f67d3a3607"
        },
        {
          "url": "https://git.kernel.org/stable/c/1f4714065b2bcbb0a4013fd355b84b848e6cc345"
        },
        {
          "url": "https://git.kernel.org/stable/c/eb652535e9ec795ef5c1078f7578eaaed755268b"
        },
        {
          "url": "https://git.kernel.org/stable/c/8da13e6d63c1a97f7302d342c89c4a56a55c7015"
        }
      ],
      "title": "net: macb: fix use-after-free access to PTP clock",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31396",
    "datePublished": "2026-04-03T15:16:00.579Z",
    "dateReserved": "2026-03-09T15:48:24.085Z",
    "dateUpdated": "2026-04-03T15:16:00.579Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-31396\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-04-03T16:16:37.887\",\"lastModified\":\"2026-04-07T13:20:55.200\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"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 \u003cTASK\u003e\\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 \u003c/TASK\u003e\\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---\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0bb848d8c64938024e45780f8032f1f67d3a3607\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1f4714065b2bcbb0a4013fd355b84b848e6cc345\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/341d01087f821aa0f165fb1ffc8bfe4e50776da7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5653af416a48f6c18f9626ae9df96f814f45ff34\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8da13e6d63c1a97f7302d342c89c4a56a55c7015\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/eb652535e9ec795ef5c1078f7578eaaed755268b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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Sightings

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Nomenclature

  • 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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.