{
  "cveId": "CVE-2026-43464",
  "url": "https://patchblox.com/security/cve/CVE-2026-43464",
  "summary": "CVE-2026-43464 is fixed in 23 products on 1 platform, first by ALAS2023-2026-1596, released April 27, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "net/mlx5e: RX, Fix XDP multi-buf frag counting for legacy RQ",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  net/mlx5e: RX, Fix XDP multi-buf frag counting for legacy RQ  XDP multi-buf programs can modify the layout of the XDP buffer when the program calls bpf_xdp_pull_data() or bpf_xdp_adjust_tail(). The referenced commit in the fixes tag corrected the assumption in the mlx5 driver that the XDP buffer layout doesn\u0027t change during a program execution. However, this fix introduced another issue: the dropped fragments still need to be counted on the driver side to avoid page fragment reference counting issues.  Such issue can be observed with the test_xdp_native_adjst_tail_shrnk_data selftest when using a payload of 3600 and shrinking by 256 bytes (an upcoming selftest patch): the last fragment gets released by the XDP code but doesn\u0027t get tracked by the driver. This results in a negative pp_ref_count during page release and the following splat:    WARNING: include/net/page_pool/helpers.h:297 at mlx5e_page_release_fragmented.isra.0\u002B0x4a/0x50 [mlx5_core], CPU#12: ip/3137   Modules linked in: [...]   CPU: 12 UID: 0 PID: 3137 Comm: ip Not tainted 6.19.0-rc3\u002B #12 NONE   Hardware name: QEMU Standard PC (Q35 \u002B ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014   RIP: 0010:mlx5e_page_release_fragmented.isra.0\u002B0x4a/0x50 [mlx5_core]   [...]   Call Trace:    \u003CTASK\u003E    mlx5e_dealloc_rx_wqe\u002B0xcb/0x1a0 [mlx5_core]    mlx5e_free_rx_descs\u002B0x7f/0x110 [mlx5_core]    mlx5e_close_rq\u002B0x50/0x60 [mlx5_core]    mlx5e_close_queues\u002B0x36/0x2c0 [mlx5_core]    mlx5e_close_channel\u002B0x1c/0x50 [mlx5_core]    mlx5e_close_channels\u002B0x45/0x80 [mlx5_core]    mlx5e_safe_switch_params\u002B0x1a5/0x230 [mlx5_core]    mlx5e_change_mtu\u002B0xf3/0x2f0 [mlx5_core]    netif_set_mtu_ext\u002B0xf1/0x230    do_setlink.isra.0\u002B0x219/0x1180    rtnl_newlink\u002B0x79f/0xb60    rtnetlink_rcv_msg\u002B0x213/0x3a0    netlink_rcv_skb\u002B0x48/0xf0    netlink_unicast\u002B0x24a/0x350    netlink_sendmsg\u002B0x1ee/0x410    __sock_sendmsg\u002B0x38/0x60    ____sys_sendmsg\u002B0x232/0x280    ___sys_sendmsg\u002B0x78/0xb0    __sys_sendmsg\u002B0x5f/0xb0    [...]    do_syscall_64\u002B0x57/0xc50  This patch fixes the issue by doing page frag counting on all the original XDP buffer fragments for all relevant XDP actions (XDP_TX , XDP_REDIRECT and XDP_PASS). This is basically reverting to the original counting before the commit in the fixes tag.  As frag_page is still pointing to the original tail, the nr_frags parameter to xdp_update_skb_frags_info() needs to be calculated in a different way to reflect the new nr_frags.",
  "published": "2026-04-27T09:00:00Z",
  "severity": "Moderate",
  "cvss": 7.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00547,
  "epssPercentile": 0.46119,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-43464",
  "fixes": [
    {
      "platform": "linux",
      "product": "bpftool6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.20-20.229.amzn2023",
      "fix": "ALAS2023-2026-1596",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1596",
      "released": "2026-04-27T09:00:00Z"
    },
    {
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      "product": "bpftool6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.20-20.229.amzn2023",
      "fix": "ALAS2023-2026-1596",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1596",
      "released": "2026-04-27T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-livepatch-6.18.20-20.229",
      "release": "amzn 2023",
      "fixedVersion": "1:1.0-0.amzn2023",
      "fix": "ALAS2023-2026-1596",
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      "released": "2026-04-27T09:00:00Z"
    },
    {
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      "fixedVersion": "1:6.18.20-20.229.amzn2023",
      "fix": "ALAS2023-2026-1596",
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      "released": "2026-04-27T09:00:00Z"
    },
    {
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      "fix": "ALAS2023-2026-1596",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1596",
      "released": "2026-04-27T09:00:00Z"
    },
    {
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      "product": "kernel6.18-debuginfo-common-aarch64",
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      "fix": "ALAS2023-2026-1596",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1596",
      "released": "2026-04-27T09:00:00Z"
    },
    {
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      "product": "kernel6.18-debuginfo-common-x86_64",
      "release": "amzn 2023",
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      "fix": "ALAS2023-2026-1596",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1596",
      "released": "2026-04-27T09:00:00Z"
    },
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      "fix": "ALAS2023-2026-1596",
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      "released": "2026-04-27T09:00:00Z"
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    {
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      "fix": "ALAS2023-2026-1596",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1596",
      "released": "2026-04-27T09:00:00Z"
    },
    {
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      "fix": "ALAS2023-2026-1596",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1596",
      "released": "2026-04-27T09:00:00Z"
    },
    {
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      "fix": "ALAS2023-2026-1596",
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      "released": "2026-04-27T09:00:00Z"
    },
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      "fix": "ALAS2023-2026-1596",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1596",
      "released": "2026-04-27T09:00:00Z"
    },
    {
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      "fix": "ALAS2023-2026-1596",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1596",
      "released": "2026-04-27T09:00:00Z"
    },
    {
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      "fix": "ALAS2023-2026-1596",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1596",
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    },
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      "fix": "ALAS2023-2026-1596",
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      "fix": "ALAS2023-2026-1596",
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      "fix": "ALAS2023-2026-1596",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1596",
      "released": "2026-04-27T09:00:00Z"
    },
    {
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      "fix": "DEBIAN-CVE-2026-43464",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-43464",
      "released": "2026-05-15T16:01:09Z"
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    {
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      "fix": "DEBIAN-CVE-2026-43464",
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    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}