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CVE-2023-53372 (GCVE-0-2023-53372)

Vulnerability from cvelistv5 – Published: 2025-09-18 13:33 – Updated: 2026-08-05 09:13
VLAI
Title
sctp: fix a potential overflow in sctp_ifwdtsn_skip
Summary
In the Linux kernel, the following vulnerability has been resolved: sctp: fix a potential overflow in sctp_ifwdtsn_skip Currently, when traversing ifwdtsn skips with _sctp_walk_ifwdtsn, it only checks the pos against the end of the chunk. However, the data left for the last pos may be < sizeof(struct sctp_ifwdtsn_skip), and dereference it as struct sctp_ifwdtsn_skip may cause coverflow. This patch fixes it by checking the pos against "the end of the chunk - sizeof(struct sctp_ifwdtsn_skip)" in sctp_ifwdtsn_skip, similar to sctp_fwdtsn_skip.
Severity
8.2 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
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: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-14 18:53 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 0fc2ea922c8ad5520c80f03facbf396c81dce802 , < 4fbd094d4131a10d06a45d64158567052a35b3f4 (git)
Affected: 0fc2ea922c8ad5520c80f03facbf396c81dce802 , < ad831a7079c99c01e801764b53bc9997c2e9c0f7 (git)
Affected: 0fc2ea922c8ad5520c80f03facbf396c81dce802 , < 79b28f42214a3d0d6a8c514db3602260bd5d6cb5 (git)
Affected: 0fc2ea922c8ad5520c80f03facbf396c81dce802 , < 6109f5b13ce3e3e537db6f18976ec0e9118d1c6f (git)
Affected: 0fc2ea922c8ad5520c80f03facbf396c81dce802 , < 5c9367ac5a22d71841bcd00130f9146c9b227d57 (git)
Affected: 0fc2ea922c8ad5520c80f03facbf396c81dce802 , < ad988e9b5ff04607e624a459209e8c2d0c15fc73 (git)
Affected: 0fc2ea922c8ad5520c80f03facbf396c81dce802 , < 32832a2caf82663870126c5186cf8f86c8b2a649 (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.16
Unaffected: 0 , < 4.16 (semver)
Unaffected: 4.19.281 , ≤ 4.19.* (semver)
Unaffected: 5.4.241 , ≤ 5.4.* (semver)
Unaffected: 5.10.178 , ≤ 5.10.* (semver)
Unaffected: 5.15.108 , ≤ 5.15.* (semver)
Unaffected: 6.1.25 , ≤ 6.1.* (semver)
Unaffected: 6.2.12 , ≤ 6.2.* (semver)
Unaffected: 6.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: fix a potential overflow in sctp_ifwdtsn_skip\n\nCurrently, when traversing ifwdtsn skips with _sctp_walk_ifwdtsn, it only\nchecks the pos against the end of the chunk. However, the data left for\nthe last pos may be \u003c sizeof(struct sctp_ifwdtsn_skip), and dereference\nit as struct sctp_ifwdtsn_skip may cause coverflow.\n\nThis patch fixes it by checking the pos against \"the end of the chunk -\nsizeof(struct sctp_ifwdtsn_skip)\" in sctp_ifwdtsn_skip, similar to\nsctp_fwdtsn_skip."
          }
        ],
        "id": "CVE-2023-53372",
        "lastModified": "2026-08-04T10:19:03.607",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 8.2,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "LOW",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
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              "source": "nvd@nist.gov",
              "type": "Primary"
            },
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                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
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              },
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              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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            }
          ],
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            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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                  },
                  {
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                  {
                    "technicalImpact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-01-14T18:53:52.812844Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2025-09-18T14:15:39.750",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
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            "url": "https://git.kernel.org/stable/c/32832a2caf82663870126c5186cf8f86c8b2a649"
          },
          {
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            "tags": [
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          },
          {
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            "url": "https://git.kernel.org/stable/c/5c9367ac5a22d71841bcd00130f9146c9b227d57"
          },
          {
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            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/79b28f42214a3d0d6a8c514db3602260bd5d6cb5"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/ad831a7079c99c01e801764b53bc9997c2e9c0f7"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/ad988e9b5ff04607e624a459209e8c2d0c15fc73"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-787"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          },
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-787"
              }
            ],
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "type": "Secondary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:20:42+00:00",
      "cve": "CVE-2023-53372",
      "id": "CVE-2023-53372",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:fixed": "340",
      "product_status:known_affected": "16",
      "product_status:known_not_affected": "226",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: sctp: fix a potential overflow in sctp_ifwdtsn_skip",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53372.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "cvssV3_1": {
                  "attackComplexity": "LOW",
                  "attackVector": "LOCAL",
                  "availabilityImpact": "HIGH",
                  "baseScore": 7.8,
                  "baseSeverity": "HIGH",
                  "confidentialityImpact": "HIGH",
                  "integrityImpact": "HIGH",
                  "privilegesRequired": "LOW",
                  "scope": "UNCHANGED",
                  "userInteraction": "NONE",
                  "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "version": "3.1"
                }
              },
              {
                "other": {
                  "content": {
                    "id": "CVE-2023-53372",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-01-14T18:53:52.812844Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "problemTypes": [
              {
                "descriptions": [
                  {
                    "cweId": "CWE-787",
                    "description": "CWE-787 Out-of-bounds Write",
                    "lang": "en",
                    "type": "CWE"
                  }
                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-01-14T18:53:48.396Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "net/sctp/stream_interleave.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "4fbd094d4131a10d06a45d64158567052a35b3f4",
                  "status": "affected",
                  "version": "0fc2ea922c8ad5520c80f03facbf396c81dce802",
                  "versionType": "git"
                },
                {
                  "lessThan": "ad831a7079c99c01e801764b53bc9997c2e9c0f7",
                  "status": "affected",
                  "version": "0fc2ea922c8ad5520c80f03facbf396c81dce802",
                  "versionType": "git"
                },
                {
                  "lessThan": "79b28f42214a3d0d6a8c514db3602260bd5d6cb5",
                  "status": "affected",
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                  "versionType": "git"
                },
                {
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                  "versionType": "git"
                },
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                  "versionType": "git"
                },
                {
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                  "status": "affected",
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                  "versionType": "git"
                },
                {
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                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "net/sctp/stream_interleave.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "4.16"
                },
                {
                  "lessThan": "4.16",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "4.19.*",
                  "status": "unaffected",
                  "version": "4.19.281",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.4.*",
                  "status": "unaffected",
                  "version": "5.4.241",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.10.*",
                  "status": "unaffected",
                  "version": "5.10.178",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.15.*",
                  "status": "unaffected",
                  "version": "5.15.108",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.1.*",
                  "status": "unaffected",
                  "version": "6.1.25",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.2.*",
                  "status": "unaffected",
                  "version": "6.2.12",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.3",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.19.281",
                      "versionStartIncluding": "4.16",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.4.241",
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                    {
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                      "versionEndExcluding": "5.10.178",
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                    {
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                      "versionEndExcluding": "5.15.108",
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                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1.25",
                      "versionStartIncluding": "4.16",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.2.12",
                      "versionStartIncluding": "4.16",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.3",
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                      "vulnerable": true
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                  ],
                  "negate": false,
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          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: fix a potential overflow in sctp_ifwdtsn_skip\n\nCurrently, when traversing ifwdtsn skips with _sctp_walk_ifwdtsn, it only\nchecks the pos against the end of the chunk. However, the data left for\nthe last pos may be \u003c sizeof(struct sctp_ifwdtsn_skip), and dereference\nit as struct sctp_ifwdtsn_skip may cause coverflow.\n\nThis patch fixes it by checking the pos against \"the end of the chunk -\nsizeof(struct sctp_ifwdtsn_skip)\" in sctp_ifwdtsn_skip, similar to\nsctp_fwdtsn_skip."
            }
          ],
          "metrics": [
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                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:N - The bug is in parsing a received I-FORWARD-TSN chunk on the SCTP input path (sctp_rcv \u2192 state machine \u2192 sctp_sf_eat_fwd_tsn \u2192 sctp_validate_iftsn/sctp_handle_iftsn). A remote peer reaches it by sending crafted SCTP packets over an established association.\nAC:L - Once an association has negotiated PR-SCTP and stream interleaving, the attacker fully controls chunk length and contents and can deterministically make the final skip entry shorter than sizeof(struct sctp_ifwdtsn_skip). No race or uncontrollable memory layout is required.\nPR:N - Exploitation needs only being the remote SCTP peer of a service that accepts associations with interleaving enabled; no local account, capability, or authenticated privilege on the victim is required.\nUI:N - The attacker initiates the association and sends the malformed I-FWD-TSN; no additional victim action (mount, open, click) is required at exploit time.\nS:U - The out-of-bounds read and any resulting fault stay within the same host kernel authority and do not cross a VM, IOMMU, or sandbox boundary.\nC:L - The walk can read up to 7 bytes past the chunk (and past skb_tail_pointer into adjacent/uninitialized kernel memory). That is a real OOB read but strictly bounded to a few bytes and those bytes are only used as stream/mid/flags internally, not returned to the attacker.\nI:N - The defect is an out-of-bounds read only; stream IDs are still bounds-checked against incnt before use, and there is no OOB write or memory-corruption write primitive. Any stream-skip side effects are within what a peer can already do with a well-formed I-FWD-TSN.\nA:H - Reading past skb_tail_pointer into unmapped or invalid memory can oops/panic the kernel, and a remote peer can trigger this repeatedly on a vulnerable interleaving-enabled association."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T09:13:40.871Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
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          "references": [
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              "url": "https://git.kernel.org/stable/c/4fbd094d4131a10d06a45d64158567052a35b3f4"
            },
            {
              "url": "https://git.kernel.org/stable/c/ad831a7079c99c01e801764b53bc9997c2e9c0f7"
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      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2023-53372",
        "datePublished": "2025-09-18T13:33:19.549Z",
        "dateReserved": "2025-09-17T14:54:09.734Z",
        "dateUpdated": "2026-08-05T09:13:40.871Z",
        "state": "PUBLISHED"
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  }
}



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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.