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CVE-2022-49920 (GCVE-0-2022-49920)

Vulnerability from cvelistv5 – Published: 2025-05-01 14:10 – Updated: 2026-08-05 08:56
VLAI
Title
netfilter: nf_tables: netlink notifier might race to release objects
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: netlink notifier might race to release objects commit release path is invoked via call_rcu and it runs lockless to release the objects after rcu grace period. The netlink notifier handler might win race to remove objects that the transaction context is still referencing from the commit release path. Call rcu_barrier() to ensure pending rcu callbacks run to completion if the list of transactions to be destroyed is not empty.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.7 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 14:58 UTC
CWE
  • CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 6001a930ce0378b62210d4f83583fc88a903d89d , < 1ffe7100411a8b9015115ce124cd6c9c9da6f8e3 (git)
Affected: 6001a930ce0378b62210d4f83583fc88a903d89d , < e40b7c44d19e327ad8b49a491ef1fa8dcc4566e0 (git)
Affected: 6001a930ce0378b62210d4f83583fc88a903d89d , < d4bc8271db21ea9f1c86a1ca4d64999f184d4aae (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.12
Unaffected: 0 , < 5.12 (semver)
Unaffected: 5.15.78 , ≤ 5.15.* (semver)
Unaffected: 6.0.8 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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                    "cweId": "CWE-362",
                    "description": "CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027)",
                    "lang": "en",
                    "type": "CWE"
                  }
                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2025-10-01T14:19:13.590Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "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": [
                {
                  "lessThan": "1ffe7100411a8b9015115ce124cd6c9c9da6f8e3",
                  "status": "affected",
                  "version": "6001a930ce0378b62210d4f83583fc88a903d89d",
                  "versionType": "git"
                },
                {
                  "lessThan": "e40b7c44d19e327ad8b49a491ef1fa8dcc4566e0",
                  "status": "affected",
                  "version": "6001a930ce0378b62210d4f83583fc88a903d89d",
                  "versionType": "git"
                },
                {
                  "lessThan": "d4bc8271db21ea9f1c86a1ca4d64999f184d4aae",
                  "status": "affected",
                  "version": "6001a930ce0378b62210d4f83583fc88a903d89d",
                  "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": "5.12"
                },
                {
                  "lessThan": "5.12",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.15.*",
                  "status": "unaffected",
                  "version": "5.15.78",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.0.*",
                  "status": "unaffected",
                  "version": "6.0.8",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.1",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.78",
                      "versionStartIncluding": "5.12",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.0.8",
                      "versionStartIncluding": "5.12",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1",
                      "versionStartIncluding": "5.12",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: netlink notifier might race to release objects\n\ncommit release path is invoked via call_rcu and it runs lockless to\nrelease the objects after rcu grace period. The netlink notifier handler\nmight win race to remove objects that the transaction context is still\nreferencing from the commit release path.\n\nCall rcu_barrier() to ensure pending rcu callbacks run to completion\nif the list of transactions to be destroyed is not empty."
            }
          ],
          "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 bug is reached via NETLINK_NETFILTER/nftables syscalls (create an owned table, commit deletions, then close the socket to fire NETLINK_URELEASE). This is a local netlink path, not packet-triggered remote code.\nAC:L - The attacker controls both sides of the race: committing nftables deletions that schedule async destroy work, then closing the owned netlink socket to trigger nft_rcv_nl_event. No external timing or victim state is required.\nPR:L - nfnetlink only requires CAP_NET_ADMIN via netlink_net_capable() in the network namespace\u2019s user_ns, which an unprivileged user obtains with user+net namespaces. NFT_TABLE_F_OWNER setup is reachable without real root.\nUI:N - Exploitation needs only the attacker\u2019s own netlink operations and socket close; no other user action is required.\nS:U - Impact is confined to the local kernel (standard nftables UAF/privilege escalation). It does not cross a VM, IOMMU, or other security-authority boundary.\nC:H - Syzbot confirms a KASAN use-after-free in nft_commit_release/nf_tables_trans_destroy_work after __nft_release_table frees objects still referenced by pending transactions; UAF of heap objects enables arbitrary read primitives.\nI:H - The same double-free/UAF of nftables chains/rules/sets is heap-controllable and can be turned into arbitrary write or control-flow hijacking, consistent with other exploitable nf_tables UAFs.\nA:H - The UAF reliably causes kernel oops/panic (observed KASAN crash in destroy work), so availability impact is high even without a full exploit."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T08:56:41.698Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/1ffe7100411a8b9015115ce124cd6c9c9da6f8e3"
            },
            {
              "url": "https://git.kernel.org/stable/c/e40b7c44d19e327ad8b49a491ef1fa8dcc4566e0"
            },
            {
              "url": "https://git.kernel.org/stable/c/d4bc8271db21ea9f1c86a1ca4d64999f184d4aae"
            }
          ],
          "title": "netfilter: nf_tables: netlink notifier might race to release objects",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2022-49920",
        "datePublished": "2025-05-01T14:10:59.436Z",
        "dateReserved": "2025-05-01T14:05:17.252Z",
        "dateUpdated": "2026-08-05T08:56:41.698Z",
        "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.