CVE-2026-98029 (GCVE-0-2026-98029)

Vulnerability from cvelistv5 – Published: 2026-09-25 10:23 – Updated: 2026-09-25 14:41
VLAI
Title
eth: nfp: bound the ntuple rule dump by the caller's buffer size
Summary
In the Linux kernel, the following vulnerability has been resolved: eth: nfp: bound the ntuple rule dump by the caller's buffer size nfp_net_get_fs_loc() dumps every entry of nn->fs.list into rule_locs[] without consulting cmd->rule_cnt, which is how many entries the caller had room for. ETHTOOL_GRXCLSRLALL requires no CAP_NET_ADMIN and the ioctl sizes the buffer from the rule_cnt userspace passes in, so once an admin has installed flow steering rules any user can ask for fewer slots than there are rules and run off the end of the allocation. A rule_cnt of 0 leaves the buffer pointer NULL and the walk dereferences it. Bail out with -EMSGSIZE when the buffer fills up, the way the other ntuple capable drivers do, and report how many locations were filled so a shrinking rule list does not leave the caller reading stale slots.
Severity
7 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 9eb03bb1c035ff6e2c3a34046419446588253dda , < 82812583b9c69c241da6da4186f14e9df2516488 (git)
Affected: 9eb03bb1c035ff6e2c3a34046419446588253dda , < a7e023c63e855761c1426cee8d17c2bca32aa339 (git)
Affected: 9eb03bb1c035ff6e2c3a34046419446588253dda , < ecebfdaab72a504c10f4907bd00fc3b705ec3b12 (git)
Affected: 9eb03bb1c035ff6e2c3a34046419446588253dda , < f1986bf87b0709c95126fe196cf39e5b8c8453a1 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.8
Unaffected: 0 , < 6.8 (semver)
Unaffected: 6.12.111 , ≤ 6.12.* (semver)
Unaffected: 6.18.53 , ≤ 6.18.* (semver)
Unaffected: 7.2.7 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "82812583b9c69c241da6da4186f14e9df2516488",
              "status": "affected",
              "version": "9eb03bb1c035ff6e2c3a34046419446588253dda",
              "versionType": "git"
            },
            {
              "lessThan": "a7e023c63e855761c1426cee8d17c2bca32aa339",
              "status": "affected",
              "version": "9eb03bb1c035ff6e2c3a34046419446588253dda",
              "versionType": "git"
            },
            {
              "lessThan": "ecebfdaab72a504c10f4907bd00fc3b705ec3b12",
              "status": "affected",
              "version": "9eb03bb1c035ff6e2c3a34046419446588253dda",
              "versionType": "git"
            },
            {
              "lessThan": "f1986bf87b0709c95126fe196cf39e5b8c8453a1",
              "status": "affected",
              "version": "9eb03bb1c035ff6e2c3a34046419446588253dda",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.8"
            },
            {
              "lessThan": "6.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.111",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.53",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.7",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc3",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\neth: nfp: bound the ntuple rule dump by the caller\u0027s buffer size\n\nnfp_net_get_fs_loc() dumps every entry of nn-\u003efs.list into rule_locs[]\nwithout consulting cmd-\u003erule_cnt, which is how many entries the caller\nhad room for.  ETHTOOL_GRXCLSRLALL requires no CAP_NET_ADMIN and the\nioctl sizes the buffer from the rule_cnt userspace passes in, so once an\nadmin has installed flow steering rules any user can ask for fewer slots\nthan there are rules and run off the end of the allocation.  A rule_cnt\nof 0 leaves the buffer pointer NULL and the walk dereferences it.\n\nBail out with -EMSGSIZE when the buffer fills up, the way the other\nntuple capable drivers do, and report how many locations were filled so\na shrinking rule list does not leave the caller reading stale slots."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The trigger is a local SIOCETHTOOL ioctl (ETHTOOL_GRXCLSRLALL) on a socket, reaching ethtool_get_rxnfc() -\u003e nfp_net_get_rxnfc() -\u003e nfp_net_get_fs_loc(). The rule_cnt that sizes the buffer comes from the local caller, not from any packet off the wire.\nAC:H - The overflow needs a non-empty nn-\u003efs.list on an NFP NIC with NFP_NET_CFG_CTRL_FLOW_STEER. Only an admin can create those rules, via set_rxnfc/nfp_net_fs_add with CAP_NET_ADMIN on a physical init-netns device. The unprivileged attacker cannot create this state and must wait for it to exist.\nPR:L - dev_ethtool() lists ETHTOOL_GRXCLSRLALL among the commands anyone may run and skips the ns_capable(CAP_NET_ADMIN) check for it. Any local unprivileged user can call it with a small rule_cnt.\nUI:N - No victim action is needed. The attacker issues the ioctl whenever they like, once the rules exist as a standing configuration.\nS:U - Kernel heap corruption leading to local privilege escalation or a crash stays within the kernel\u0027s own security authority.\nC:H - ethtool_get_rxnfc() sizes rule_buf with kcalloc(rule_cnt), so the attacker chooses the slab cache. nfp_net_get_fs_loc() then writes up to ~4KB of u32 rule locations past it. That corrupts adjacent kmalloc objects, which can be leveraged into an information leak.\nI:H - This is an out-of-bounds heap write into neighbouring slab objects in a cache the attacker chooses, with an attacker-chosen overflow length (rule count minus rule_cnt). It is a memory corruption primitive usable against adjacent object fields.\nA:H - With rule_cnt=0, rule_buf stays NULL and rule_locs[0] = entry-\u003eloc writes through the NULL pointer, oopsing the kernel. Larger overflows corrupt the slab and can panic the kernel. Either can be repeated at will by an unprivileged user."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-25T14:41:53.865Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/82812583b9c69c241da6da4186f14e9df2516488"
        },
        {
          "url": "https://git.kernel.org/stable/c/a7e023c63e855761c1426cee8d17c2bca32aa339"
        },
        {
          "url": "https://git.kernel.org/stable/c/ecebfdaab72a504c10f4907bd00fc3b705ec3b12"
        },
        {
          "url": "https://git.kernel.org/stable/c/f1986bf87b0709c95126fe196cf39e5b8c8453a1"
        }
      ],
      "title": "eth: nfp: bound the ntuple rule dump by the caller\u0027s buffer size",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98029",
    "datePublished": "2026-09-25T10:23:46.347Z",
    "dateReserved": "2026-09-25T10:19:56.070Z",
    "dateUpdated": "2026-09-25T14:41:53.865Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-98029",
      "date": "2026-09-28",
      "epss": "0.00121",
      "percentile": "0.01692"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "82812583b9c69c241da6da4186f14e9df2516488",
                    "status": "affected",
                    "version": "9eb03bb1c035ff6e2c3a34046419446588253dda",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "a7e023c63e855761c1426cee8d17c2bca32aa339",
                    "status": "affected",
                    "version": "9eb03bb1c035ff6e2c3a34046419446588253dda",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "ecebfdaab72a504c10f4907bd00fc3b705ec3b12",
                    "status": "affected",
                    "version": "9eb03bb1c035ff6e2c3a34046419446588253dda",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "f1986bf87b0709c95126fe196cf39e5b8c8453a1",
                    "status": "affected",
                    "version": "9eb03bb1c035ff6e2c3a34046419446588253dda",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "6.8"
                  },
                  {
                    "lessThan": "6.8",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.12.*",
                    "status": "unaffected",
                    "version": "6.12.111",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.18.*",
                    "status": "unaffected",
                    "version": "6.18.53",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "7.2.*",
                    "status": "unaffected",
                    "version": "7.2.7",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "7.3-rc3",
                    "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\neth: nfp: bound the ntuple rule dump by the caller\u0027s buffer size\n\nnfp_net_get_fs_loc() dumps every entry of nn-\u003efs.list into rule_locs[]\nwithout consulting cmd-\u003erule_cnt, which is how many entries the caller\nhad room for.  ETHTOOL_GRXCLSRLALL requires no CAP_NET_ADMIN and the\nioctl sizes the buffer from the rule_cnt userspace passes in, so once an\nadmin has installed flow steering rules any user can ask for fewer slots\nthan there are rules and run off the end of the allocation.  A rule_cnt\nof 0 leaves the buffer pointer NULL and the walk dereferences it.\n\nBail out with -EMSGSIZE when the buffer fills up, the way the other\nntuple capable drivers do, and report how many locations were filled so\na shrinking rule list does not leave the caller reading stale slots."
          }
        ],
        "id": "CVE-2026-98029",
        "lastModified": "2026-09-25T15:18:04.500",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.0,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.0,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-09-25T11:17:31.560",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/82812583b9c69c241da6da4186f14e9df2516488"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/a7e023c63e855761c1426cee8d17c2bca32aa339"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/ecebfdaab72a504c10f4907bd00fc3b705ec3b12"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f1986bf87b0709c95126fe196cf39e5b8c8453a1"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.