net: macb: fix use-after-free access to PTP clock

{
  "id": "18009479b4929c2a9575d1d03e083427f07dc5ff1d6a218f84c417ad895c45d5",
  "url": "https://osv.dev/vulnerability/CVE-2026-31396",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "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: __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",
    "evidence": "osv:CVE-2026-31396",
    "products": [
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    "severity": "high",
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      "metrics": [
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      "modified": "2026-10-28T02:30:27.069043096Z",
      "provider": "osv",
      "references": [
        "https://cert-portal.siemens.com/productcert/html/ssa-019113.html",
        "https://cert-portal.siemens.com/productcert/html/ssa-082556.html",
        "https://cert-portal.siemens.com/productcert/html/ssa-457936.html",
        "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://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31396.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-31396",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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    "severity_evidence": "/severity/0/score"
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  "source_id": "core-osv",
  "document_id": 493185,
  "published_at": "2026-04-03T15:16:00.579+00:00"
}