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CVE-2024-26642 (GCVE-0-2024-26642)

Vulnerability from cvelistv5 – Published: 2024-03-21 10:43 – Updated: 2026-08-05 11:26
VLAI
Title
netfilter: nf_tables: disallow anonymous set with timeout flag
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: disallow anonymous set with timeout flag Anonymous sets are never used with timeout from userspace, reject this. Exception to this rule is NFT_SET_EVAL to ensure legacy meters still work.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-04-03 17:43 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 761da2935d6e18d178582dbdf315a3a458555505 , < e4988d8415bd0294d6f9f4a1e7095f8b50a97ca9 (git)
Affected: 761da2935d6e18d178582dbdf315a3a458555505 , < e9a0d3f376eb356d54ffce36e7cc37514cbfbd6f (git)
Affected: 761da2935d6e18d178582dbdf315a3a458555505 , < fe40ffbca19dc70d7c6b1e3c77b9ccb404c57351 (git)
Affected: 761da2935d6e18d178582dbdf315a3a458555505 , < 7cdc1be24cc1bcd56a3e89ac4aef20e31ad09199 (git)
Affected: 761da2935d6e18d178582dbdf315a3a458555505 , < 72c1efe3f247a581667b7d368fff3bd9a03cd57a (git)
Affected: 761da2935d6e18d178582dbdf315a3a458555505 , < c0c2176d1814b92ea4c8e7eb7c9cd94cd99c1b12 (git)
Affected: 761da2935d6e18d178582dbdf315a3a458555505 , < 8e07c16695583a66e81f67ce4c46e94dece47ba7 (git)
Affected: 761da2935d6e18d178582dbdf315a3a458555505 , < 16603605b667b70da974bea8216c93e7db043bf1 (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.1
Unaffected: 0 , < 4.1 (semver)
Unaffected: 4.19.312 , ≤ 4.19.* (semver)
Unaffected: 5.4.274 , ≤ 5.4.* (semver)
Unaffected: 5.10.215 , ≤ 5.10.* (semver)
Unaffected: 5.15.154 , ≤ 5.15.* (semver)
Unaffected: 6.1.84 , ≤ 6.1.* (semver)
Unaffected: 6.6.24 , ≤ 6.6.* (semver)
Unaffected: 6.7.12 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < * (custom)
guessed Create a notification for this product.
Show details on NVD website
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                  "version": "761da2935d6e18d178582dbdf315a3a458555505",
                  "versionType": "git"
                },
                {
                  "lessThan": "72c1efe3f247a581667b7d368fff3bd9a03cd57a",
                  "status": "affected",
                  "version": "761da2935d6e18d178582dbdf315a3a458555505",
                  "versionType": "git"
                },
                {
                  "lessThan": "c0c2176d1814b92ea4c8e7eb7c9cd94cd99c1b12",
                  "status": "affected",
                  "version": "761da2935d6e18d178582dbdf315a3a458555505",
                  "versionType": "git"
                },
                {
                  "lessThan": "8e07c16695583a66e81f67ce4c46e94dece47ba7",
                  "status": "affected",
                  "version": "761da2935d6e18d178582dbdf315a3a458555505",
                  "versionType": "git"
                },
                {
                  "lessThan": "16603605b667b70da974bea8216c93e7db043bf1",
                  "status": "affected",
                  "version": "761da2935d6e18d178582dbdf315a3a458555505",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "net/netfilter/nf_tables_api.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "4.1"
                },
                {
                  "lessThan": "4.1",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "4.19.*",
                  "status": "unaffected",
                  "version": "4.19.312",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.4.*",
                  "status": "unaffected",
                  "version": "5.4.274",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.10.*",
                  "status": "unaffected",
                  "version": "5.10.215",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.15.*",
                  "status": "unaffected",
                  "version": "5.15.154",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.1.*",
                  "status": "unaffected",
                  "version": "6.1.84",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.24",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.7.*",
                  "status": "unaffected",
                  "version": "6.7.12",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.8",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.19.312",
                      "versionStartIncluding": "4.1",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.4.274",
                      "versionStartIncluding": "4.1",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.215",
                      "versionStartIncluding": "4.1",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.154",
                      "versionStartIncluding": "4.1",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1.84",
                      "versionStartIncluding": "4.1",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6.24",
                      "versionStartIncluding": "4.1",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.7.12",
                      "versionStartIncluding": "4.1",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.8",
                      "versionStartIncluding": "4.1",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: disallow anonymous set with timeout flag\n\nAnonymous sets are never used with timeout from userspace, reject this.\nException to this rule is NFT_SET_EVAL to ensure legacy meters still work."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:L - The vulnerable configuration is created and destroyed through the nfnetlink/nf_tables netlink interface (NFT_MSG_NEWSET/NEWSETELEM/DELRULE), which requires a local socket on the system. Netfilter/nftables control plane is explicitly a local attack vector.\nAC:L - The attacker controls both sides of the race: they choose the per-element timeout (driving when the 1 s-interval async rhash GC worker collects elements) and issue the rule-delete/abort transaction that frees the anonymous set, and can retry the loop indefinitely until the batched GC work lands after `nft_rhash_destroy()`.\nPR:L - `nfnetlink_rcv()` requires only CAP_NET_ADMIN over the network namespace, which any unprivileged user obtains via `unshare -Urn`; nftables is fully functional per-netns, so a basic local user suffices.\nUI:N - The entire sequence \u2014 creating the table/chain/rule with the inline anonymous timeout set, adding expiring elements, and deleting the binding rule \u2014 is performed by the attacker\u0027s own process with no victim action.\nS:U - The use-after-free corrupts kernel heap state within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The stale GC batch reads freed `nft_rhash_elem` memory (keys hashed by `rhashtable_remove_fast()`, extension data dereferenced by `nft_setelem_data_deactivate()`), which the attacker can reallocate and spray, yielding a kernel-memory disclosure primitive and leaking kernel pointers.\nI:H - `nft_setelem_remove()` performs rhashtable unlink writes into a freed bucket table and freed nodes, `nft_use_dec()` decrements refcounts inside reallocated objects, and the elements are later destroyed a second time \u2014 a write/decrement/double-free primitive of the class routinely leveraged for nftables local privilege escalation.\nA:H - Operating on freed elements and a destroyed rhashtable reliably produces slab corruption, refcount underflow warnings, and kernel oops/panic, and the attacker can trigger it repeatedly."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T11:26:30.075Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/e4988d8415bd0294d6f9f4a1e7095f8b50a97ca9"
            },
            {
              "url": "https://git.kernel.org/stable/c/e9a0d3f376eb356d54ffce36e7cc37514cbfbd6f"
            },
            {
              "url": "https://git.kernel.org/stable/c/fe40ffbca19dc70d7c6b1e3c77b9ccb404c57351"
            },
            {
              "url": "https://git.kernel.org/stable/c/7cdc1be24cc1bcd56a3e89ac4aef20e31ad09199"
            },
            {
              "url": "https://git.kernel.org/stable/c/72c1efe3f247a581667b7d368fff3bd9a03cd57a"
            },
            {
              "url": "https://git.kernel.org/stable/c/c0c2176d1814b92ea4c8e7eb7c9cd94cd99c1b12"
            },
            {
              "url": "https://git.kernel.org/stable/c/8e07c16695583a66e81f67ce4c46e94dece47ba7"
            },
            {
              "url": "https://git.kernel.org/stable/c/16603605b667b70da974bea8216c93e7db043bf1"
            }
          ],
          "title": "netfilter: nf_tables: disallow anonymous set with timeout flag",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-26642",
        "datePublished": "2024-03-21T10:43:43.495Z",
        "dateReserved": "2024-02-19T14:20:24.137Z",
        "dateUpdated": "2026-08-05T11:26:30.075Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.


Detection rules are retrieved from Rulezet.


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.