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
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7018 records in the last 180 days details
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)
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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",
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                "timestamp": "2026-01-14T18:53:52.812844Z",
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        "published": "2025-09-18T14:15:39.750",
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          },
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            "tags": [
              "Patch"
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          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
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            ],
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          }
        ],
        "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": "2026-10-30T02:50:10+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": "228",
      "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": {
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          {
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              {
                "cvssV3_1": {
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                  "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"
                },
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                },
                {
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                  "versionType": "git"
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                  "versionType": "git"
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              ]
            },
            {
              "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"
                }
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          ],
          "cpeApplicability": [
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                      "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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                      "versionEndExcluding": "6.1.25",
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                      "vulnerable": true
                    },
                    {
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                      "vulnerable": true
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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."
            }
          ],
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                "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."
                }
              ]
            }
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            "dateUpdated": "2026-08-05T09:13:40.871Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
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        "assignerShortName": "Linux",
        "cveId": "CVE-2023-53372",
        "datePublished": "2025-09-18T13:33:19.549Z",
        "dateReserved": "2025-09-17T14:54:09.734Z",
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  }
}



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