CVE-2026-98807 (GCVE-0-2026-98807)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:48 – Updated: 2026-10-19 09:26
VLAI
Title
net/mlx5: Fix slab-out-of-bounds when handling team device events
Summary
In the Linux kernel, the following vulnerability has been resolved: net/mlx5: Fix slab-out-of-bounds when handling team device events The mlx5_handle_changeupper_event() and mlx5_handle_changeinfodata_event() functions check for LAG masters (which includes both bonding and team devices) but only call bonding-specific APIs. When processing team device events, calling bond_slave_get_rcu() and bond_is_slave_inactive() on team_port structures causes KASAN to detect an out-of-bounds memory access since team_port is smaller than bond slave. Fix this by wrapping the bond-specific API calls with a check for bonding devices. This allows the function to still process LAG events for both bonding and teams but only calls bond-specific functions when dealing with actual bonding devices. For mlx5_handle_changeinfodata_event(), keep the explicit bond check as mlx5 doesn't handle state information for team ports anyway. Tested with Mellanox ConnectX-5 on Linux 7.2.0-rc6: - Bonding: PASS (no regressions) - Team device: PASS (no KASAN errors)
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7018 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 54493a08e21f46446b3b24577c5a6f229d049757 , < 16ca0e79f31ea810346a79dda545ba344ede1d47 (git)
Affected: 54493a08e21f46446b3b24577c5a6f229d049757 , < 3a6e67ff267af2053a793825c3b7844741fed461 (git)
Affected: 54493a08e21f46446b3b24577c5a6f229d049757 , < 8117cbc504cb01980258d8a8c9be8f57cf0aaceb (git)
Affected: 54493a08e21f46446b3b24577c5a6f229d049757 , < 04c824940d52871c49866a4ac67b504146f7cf35 (git)
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Linux Linux Affected: 5.18
Unaffected: 0 , < 5.18 (semver)
Unaffected: 6.12.113 , ≤ 6.12.* (semver)
Unaffected: 6.18.56 , ≤ 6.18.* (semver)
Unaffected: 7.2.10 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/mellanox/mlx5/core/lag/lag.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "16ca0e79f31ea810346a79dda545ba344ede1d47",
              "status": "affected",
              "version": "54493a08e21f46446b3b24577c5a6f229d049757",
              "versionType": "git"
            },
            {
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              "versionType": "git"
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          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.18"
            },
            {
              "lessThan": "5.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "versionType": "semver"
            },
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              "versionType": "semver"
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              "versionType": "semver"
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            {
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            }
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        }
      ],
      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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                  "versionStartIncluding": "5.18",
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                },
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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/mlx5: Fix slab-out-of-bounds when handling team device events\n\nThe mlx5_handle_changeupper_event() and mlx5_handle_changeinfodata_event()\nfunctions check for LAG masters (which includes both bonding and team\ndevices) but only call bonding-specific APIs. When processing team device\nevents, calling bond_slave_get_rcu() and bond_is_slave_inactive() on\nteam_port structures causes KASAN to detect an out-of-bounds memory access\nsince team_port is smaller than bond slave.\n\nFix this by wrapping the bond-specific API calls with a check for bonding\ndevices. This allows the function to still process LAG events for both\nbonding and teams but only calls bond-specific functions when dealing with\nactual bonding devices.\n\nFor mlx5_handle_changeinfodata_event(), keep the explicit bond check as\nmlx5 doesn\u0027t handle state information for team ports anyway.\n\nTested with Mellanox ConnectX-5 on Linux 7.2.0-rc6:\n- Bonding: PASS (no regressions)\n- Team device: PASS (no KASAN errors)"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:26:00.670Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/16ca0e79f31ea810346a79dda545ba344ede1d47"
        },
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          "url": "https://git.kernel.org/stable/c/3a6e67ff267af2053a793825c3b7844741fed461"
        },
        {
          "url": "https://git.kernel.org/stable/c/8117cbc504cb01980258d8a8c9be8f57cf0aaceb"
        },
        {
          "url": "https://git.kernel.org/stable/c/04c824940d52871c49866a4ac67b504146f7cf35"
        }
      ],
      "title": "net/mlx5: Fix slab-out-of-bounds when handling team device events",
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  },
  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98807",
    "datePublished": "2026-10-18T15:48:53.992Z",
    "dateReserved": "2026-09-25T10:25:14.371Z",
    "dateUpdated": "2026-10-19T09:26:00.670Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-11-01",
      "epss": "0.00175",
      "percentile": "0.06999"
    },
    "microsoft_vex": {
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      "cve": "CVE-2026-98807",
      "id": "msrc_CVE-2026-98807",
      "initial_release_date": "2026-10-20T01:02:36.000Z",
      "product_status:known_affected": "1",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "net/mlx5: Fix slab-out-of-bounds when handling team device events",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98807.json",
      "version": "2"
    },
    "nvd": {
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                "programFiles": [
                  "drivers/net/ethernet/mellanox/mlx5/core/lag/lag.c"
                ],
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                "vendor": "Linux",
                "versions": [
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                    "versionType": "semver"
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                    "versionType": "semver"
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          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5: Fix slab-out-of-bounds when handling team device events\n\nThe mlx5_handle_changeupper_event() and mlx5_handle_changeinfodata_event()\nfunctions check for LAG masters (which includes both bonding and team\ndevices) but only call bonding-specific APIs. When processing team device\nevents, calling bond_slave_get_rcu() and bond_is_slave_inactive() on\nteam_port structures causes KASAN to detect an out-of-bounds memory access\nsince team_port is smaller than bond slave.\n\nFix this by wrapping the bond-specific API calls with a check for bonding\ndevices. This allows the function to still process LAG events for both\nbonding and teams but only calls bond-specific functions when dealing with\nactual bonding devices.\n\nFor mlx5_handle_changeinfodata_event(), keep the explicit bond check as\nmlx5 doesn\u0027t handle state information for team ports anyway.\n\nTested with Mellanox ConnectX-5 on Linux 7.2.0-rc6:\n- Bonding: PASS (no regressions)\n- Team device: PASS (no KASAN errors)"
          }
        ],
        "id": "CVE-2026-98807",
        "lastModified": "2026-10-19T10:19:44.747",
        "metrics": {},
        "published": "2026-10-18T16:17:34.787",
        "references": [
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        "vulnStatus": "Received"
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      "cve": "CVE-2026-98807",
      "id": "CVE-2026-98807",
      "initial_release_date": "2026-10-18T00:00:00+00:00",
      "product_status:known_affected": "249",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/mlx5: Fix slab-out-of-bounds when handling team device events",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98807.json",
      "version": "3"
    }
  }
}



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