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net/mlx5e: RX, Fix XDP multi-buf frag counting for legacy RQ

Type: advisorySource: Official CVE List1 source record

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't 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't 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+0x4a/0x50 [mlx5_core], CPU#12: ip/3137 Modules linked in: [...] CPU: 12 UID: 0 PID: 3137 Comm: ip Not tainted 6.19.0-rc3+ #12 NONE Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 RIP: 0010:mlx5e_page_release_fragmented.isra.0+0x4a/0x50 [mlx5_core] [...] Call Trace: mlx5e_dealloc_rx_wqe+0xcb/0x1a0 [mlx5_core] mlx5e_free_rx_descs+0x7f/0x110 [mlx5_core] mlx5e_close_rq+0x50/0x60 [mlx5_core] mlx5e_close_queues+0x36/0x2c0 [mlx5_core] mlx

Announced Source revision 1
Original source ↗

CVE-2026-43464

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-43464

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "72328f25755ee966724f46e3a0e8e59bef2091ba",
        "lessThan": "1106412414dc3ee62999115be10ca83199b02108",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0049fd63881505566824e88cfa624638f921c808",
        "lessThan": "9488ee96b4f53d2aed474c744f0ed64f61d1dcc9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "afd5ba577c10639f62e8120df67dc70ea4b61176",
        "lessThan": "c74557495efb4bd0adefdfc8678ecdbc82a06da3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "afd5ba577c10639f62e8120df67dc70ea4b61176",
        "lessThan": "03cb50e5b74fce8bf6d92b860371b66253cf0f8d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "afd5ba577c10639f62e8120df67dc70ea4b61176",
        "lessThan": "a6413e6f6c9d9bb9833324cb3753582f7bc0f2fa",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d969645b9b7810289bf3c353ea06957373756b8e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6.6.115",
        "lessThan": "6.6.160",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.12.56",
        "lessThan": "6.12.114",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.17.6",
        "lessThan": "6.18",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "drivers/net/ethernet/mellanox/mlx5/core/en_rx.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.18"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.18",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.114",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.19",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19.9",
        "versionType": "semver",
        "lessThanOrEqual": "6.19.*"
      },
      {
        "status": "unaffected",
        "version": "7.0",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/net/ethernet/mellanox/mlx5/core/en_rx.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-43464

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#46299 · Revision 1
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Publisher date
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