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CVE-2022-48742 (GCVE-0-2022-48742)

Vulnerability from cvelistv5 – Published: 2024-06-20 11:13 – Updated: 2026-08-05 08:52
VLAI
Title
rtnetlink: make sure to refresh master_dev/m_ops in __rtnl_newlink()
Summary
In the Linux kernel, the following vulnerability has been resolved: rtnetlink: make sure to refresh master_dev/m_ops in __rtnl_newlink() While looking at one unrelated syzbot bug, I found the replay logic in __rtnl_newlink() to potentially trigger use-after-free. It is better to clear master_dev and m_ops inside the loop, in case we have to replay it.
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 2024-09-10 17:10 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ba7d49b1f0f8e5f24294a880ed576964059af5ef , < 2cf180360d66bd657e606c1217e0e668e6faa303 (git)
Affected: ba7d49b1f0f8e5f24294a880ed576964059af5ef , < 7d9211678c0f0624f74cdff36117ab8316697bb8 (git)
Affected: ba7d49b1f0f8e5f24294a880ed576964059af5ef , < a01e60a1ec6bef9be471fb7182a33c6d6f124e93 (git)
Affected: ba7d49b1f0f8e5f24294a880ed576964059af5ef , < bd43771ee9759dd9dfae946bff190e2c5a120de5 (git)
Affected: ba7d49b1f0f8e5f24294a880ed576964059af5ef , < 3bbe2019dd12b8d13671ee6cda055d49637b4c39 (git)
Affected: ba7d49b1f0f8e5f24294a880ed576964059af5ef , < def5e7070079b2a214b3b1a2fbec623e6fbfe34a (git)
Affected: ba7d49b1f0f8e5f24294a880ed576964059af5ef , < 36a9a0aee881940476b254e0352581401b23f210 (git)
Affected: ba7d49b1f0f8e5f24294a880ed576964059af5ef , < c6f6f2444bdbe0079e41914a35081530d0409963 (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.14
Unaffected: 0 , < 3.14 (semver)
Unaffected: 4.9.300 , ≤ 4.9.* (semver)
Unaffected: 4.14.265 , ≤ 4.14.* (semver)
Unaffected: 4.19.228 , ≤ 4.19.* (semver)
Unaffected: 5.4.177 , ≤ 5.4.* (semver)
Unaffected: 5.10.97 , ≤ 5.10.* (semver)
Unaffected: 5.15.20 , ≤ 5.15.* (semver)
Unaffected: 5.16.6 , ≤ 5.16.* (semver)
Unaffected: 5.17 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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                  "lessThan": "bd43771ee9759dd9dfae946bff190e2c5a120de5",
                  "status": "affected",
                  "version": "ba7d49b1f0f8e5f24294a880ed576964059af5ef",
                  "versionType": "git"
                },
                {
                  "lessThan": "3bbe2019dd12b8d13671ee6cda055d49637b4c39",
                  "status": "affected",
                  "version": "ba7d49b1f0f8e5f24294a880ed576964059af5ef",
                  "versionType": "git"
                },
                {
                  "lessThan": "def5e7070079b2a214b3b1a2fbec623e6fbfe34a",
                  "status": "affected",
                  "version": "ba7d49b1f0f8e5f24294a880ed576964059af5ef",
                  "versionType": "git"
                },
                {
                  "lessThan": "36a9a0aee881940476b254e0352581401b23f210",
                  "status": "affected",
                  "version": "ba7d49b1f0f8e5f24294a880ed576964059af5ef",
                  "versionType": "git"
                },
                {
                  "lessThan": "c6f6f2444bdbe0079e41914a35081530d0409963",
                  "status": "affected",
                  "version": "ba7d49b1f0f8e5f24294a880ed576964059af5ef",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "net/core/rtnetlink.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "3.14"
                },
                {
                  "lessThan": "3.14",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "4.9.*",
                  "status": "unaffected",
                  "version": "4.9.300",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "4.14.*",
                  "status": "unaffected",
                  "version": "4.14.265",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "4.19.*",
                  "status": "unaffected",
                  "version": "4.19.228",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.4.*",
                  "status": "unaffected",
                  "version": "5.4.177",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.10.*",
                  "status": "unaffected",
                  "version": "5.10.97",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.15.*",
                  "status": "unaffected",
                  "version": "5.15.20",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.16.*",
                  "status": "unaffected",
                  "version": "5.16.6",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "5.17",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.9.300",
                      "versionStartIncluding": "3.14",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.14.265",
                      "versionStartIncluding": "3.14",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.19.228",
                      "versionStartIncluding": "3.14",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.4.177",
                      "versionStartIncluding": "3.14",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.97",
                      "versionStartIncluding": "3.14",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.20",
                      "versionStartIncluding": "3.14",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.16.6",
                      "versionStartIncluding": "3.14",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.17",
                      "versionStartIncluding": "3.14",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrtnetlink: make sure to refresh master_dev/m_ops in __rtnl_newlink()\n\nWhile looking at one unrelated syzbot bug, I found the replay logic\nin __rtnl_newlink() to potentially trigger use-after-free.\n\nIt is better to clear master_dev and m_ops inside the loop,\nin case we have to replay it."
            }
          ],
          "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 - Triggered via RTM_NEWLINK on a local netlink/rtnetlink socket (syscall), not by remote packet processing.\nAC:L - An attacker who can issue concurrent RTM_NEWLINK operations controls both sides of the module-load unlock/replay window; CONFIG_MODULES is common and no external victim state is required.\nPR:L - RTM_NEWLINK requires CAP_NET_ADMIN checked via netlink_net_capable() against the socket netns user_ns, which an unprivileged process can obtain with user+net namespaces (unshare -Urn).\nUI:N - Exploitation needs no victim action beyond the attacker\u2019s own netlink requests.\nS:U - Impact is privilege escalation within the same kernel authority; this is not a VM/IOMMU/sandbox boundary cross.\nC:H - Stale m_ops is a use-after-free on link-ops/module memory, which can be leveraged for arbitrary kernel reads.\nI:H - UAF of m_ops can divert control through stale function pointers (e.g. slave_changelink), enabling corruption and code execution.\nA:H - Use-after-free of master link ops reliably causes kernel oops/panic even when not fully turned into code execution."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T08:52:04.588Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/2cf180360d66bd657e606c1217e0e668e6faa303"
            },
            {
              "url": "https://git.kernel.org/stable/c/7d9211678c0f0624f74cdff36117ab8316697bb8"
            },
            {
              "url": "https://git.kernel.org/stable/c/a01e60a1ec6bef9be471fb7182a33c6d6f124e93"
            },
            {
              "url": "https://git.kernel.org/stable/c/bd43771ee9759dd9dfae946bff190e2c5a120de5"
            },
            {
              "url": "https://git.kernel.org/stable/c/3bbe2019dd12b8d13671ee6cda055d49637b4c39"
            },
            {
              "url": "https://git.kernel.org/stable/c/def5e7070079b2a214b3b1a2fbec623e6fbfe34a"
            },
            {
              "url": "https://git.kernel.org/stable/c/36a9a0aee881940476b254e0352581401b23f210"
            },
            {
              "url": "https://git.kernel.org/stable/c/c6f6f2444bdbe0079e41914a35081530d0409963"
            }
          ],
          "title": "rtnetlink: make sure to refresh master_dev/m_ops in __rtnl_newlink()",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2022-48742",
        "datePublished": "2024-06-20T11:13:26.653Z",
        "dateReserved": "2024-06-20T11:09:39.054Z",
        "dateUpdated": "2026-08-05T08:52:04.588Z",
        "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.