FKIE_CVE-2026-98807

Vulnerability from fkie_nvd - Published: 2026-10-18 16:17 - Updated: 2026-10-19 10:19
Severity
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)
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/04c824940d52871c49866a4ac67b504146f7cf35
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/16ca0e79f31ea810346a79dda545ba344ede1d47
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3a6e67ff267af2053a793825c3b7844741fed461
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8117cbc504cb01980258d8a8c9be8f57cf0aaceb
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "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"
            },
            {
              "lessThan": "3a6e67ff267af2053a793825c3b7844741fed461",
              "status": "affected",
              "version": "54493a08e21f46446b3b24577c5a6f229d049757",
              "versionType": "git"
            },
            {
              "lessThan": "8117cbc504cb01980258d8a8c9be8f57cf0aaceb",
              "status": "affected",
              "version": "54493a08e21f46446b3b24577c5a6f229d049757",
              "versionType": "git"
            },
            {
              "lessThan": "04c824940d52871c49866a4ac67b504146f7cf35",
              "status": "affected",
              "version": "54493a08e21f46446b3b24577c5a6f229d049757",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "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": [
            {
              "status": "affected",
              "version": "5.18"
            },
            {
              "lessThan": "5.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.113",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.56",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "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": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/04c824940d52871c49866a4ac67b504146f7cf35"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/16ca0e79f31ea810346a79dda545ba344ede1d47"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3a6e67ff267af2053a793825c3b7844741fed461"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8117cbc504cb01980258d8a8c9be8f57cf0aaceb"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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