CVE-2026-68315 (GCVE-0-2026-68315)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:02 – Updated: 2026-08-19 16:33
VLAI
Title
sctp: validate stream count in sctp_process_strreset_inreq()
Summary
In the Linux kernel, the following vulnerability has been resolved: sctp: validate stream count in sctp_process_strreset_inreq() When processing a RESET_IN_REQUEST from a peer, sctp_process_strreset_inreq() derives the stream count from the parameter length but does not check whether the resulting RESET_OUT_REQUEST would exceed SCTP_MAX_CHUNK_LEN. The OUT request header (sctp_strreset_outreq, 16 bytes) is 8 bytes larger than the IN request header (sctp_strreset_inreq, 8 bytes). Generally, the IP payload is bounded to 65535 bytes, so the stream list cannot be large enough to trigger the overflow. However, on interfaces with MTU > 65535 (e.g., loopback with IPv6 jumbograms), a stream list that fits within the incoming IN parameter can cause a __u16 overflow in sctp_make_strreset_req() when computing the OUT request size, leading to an undersized skb allocation and a kernel BUG: net/core/skbuff.c:207 skb_panic net/core/skbuff.c:2625 skb_put net/sctp/sm_make_chunk.c:1535 sctp_addto_chunk net/sctp/sm_make_chunk.c:3695 sctp_make_strreset_req net/sctp/stream.c:655 sctp_process_strreset_inreq The local setsockopt path validates the generated reset request size. However, for an incoming-only reset, it accounts for the smaller IN request even though the peer must generate an OUT request with the same stream list. Such a request cannot be completed successfully by the peer. Reject peer IN requests whose corresponding OUT request would exceed SCTP_MAX_CHUNK_LEN. Also tighten the local check so it does not send an IN request that would require an oversized OUT request from the peer.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 7f9d68ac944e24ee5f9ac8d059ca00b1c1d34137 , < 61327d8e7cfb0259d527be17202630f556213249 (git)
Affected: 7f9d68ac944e24ee5f9ac8d059ca00b1c1d34137 , < 7cf7439948e3bf639119119922c88ec190874ca3 (git)
Affected: 7f9d68ac944e24ee5f9ac8d059ca00b1c1d34137 , < 60c47dea5d320d2fc706e9aad1db38a04df0a056 (git)
Affected: 7f9d68ac944e24ee5f9ac8d059ca00b1c1d34137 , < b255d8cd6cc68045ae9eecbac3b3c14e1f176c9b (git)
Affected: 7f9d68ac944e24ee5f9ac8d059ca00b1c1d34137 , < 6f0e39d180cd7cced647381b6fa14fd83d261047 (git)
Affected: 7f9d68ac944e24ee5f9ac8d059ca00b1c1d34137 , < 1a10fe1aa9c01f41b389a31906a77d538637c9d9 (git)
Affected: 7f9d68ac944e24ee5f9ac8d059ca00b1c1d34137 , < 00ae679cb21a035491fdad8d58dc6d79cc68b675 (git)
Affected: 7f9d68ac944e24ee5f9ac8d059ca00b1c1d34137 , < 18ae07691d43183d270de8be9dc8e027906015d9 (git)
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Linux Linux Affected: 4.11
Unaffected: 0 , < 4.11 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: validate stream count in sctp_process_strreset_inreq()\n\nWhen processing a RESET_IN_REQUEST from a peer,\nsctp_process_strreset_inreq() derives the stream count from the\nparameter length but does not check whether the resulting\nRESET_OUT_REQUEST would exceed SCTP_MAX_CHUNK_LEN.\n\nThe OUT request header (sctp_strreset_outreq, 16 bytes) is 8 bytes\nlarger than the IN request header (sctp_strreset_inreq, 8 bytes).\nGenerally, the IP payload is bounded to 65535 bytes, so the stream\nlist cannot be large enough to trigger the overflow. However, on\ninterfaces with MTU \u003e 65535 (e.g., loopback with IPv6 jumbograms), a\nstream list that fits within the incoming IN parameter can cause a\n__u16 overflow in sctp_make_strreset_req() when computing the OUT\nrequest size, leading to an undersized skb allocation and a kernel\nBUG:\n\n  net/core/skbuff.c:207         skb_panic\n  net/core/skbuff.c:2625        skb_put\n  net/sctp/sm_make_chunk.c:1535 sctp_addto_chunk\n  net/sctp/sm_make_chunk.c:3695 sctp_make_strreset_req\n  net/sctp/stream.c:655         sctp_process_strreset_inreq\n\nThe local setsockopt path validates the generated reset request size.\nHowever, for an incoming-only reset, it accounts for the smaller IN\nrequest even though the peer must generate an OUT request with the same\nstream list. Such a request cannot be completed successfully by the\npeer.\n\nReject peer IN requests whose corresponding OUT request would exceed\nSCTP_MAX_CHUNK_LEN. Also tighten the local check so it does not send an\nIN request that would require an oversized OUT request from the peer."
        }
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              "value": "AV:N - The vulnerability is triggered by processing an SCTP RECONF chunk (RESET_IN_REQUEST) received from a remote/loopback peer in the in-kernel SCTP stack; per kernel guidance net-stack bugs reachable via received packets are Network.\nAC:L - The attacker fully controls the stream list length in the IN request, and the required MTU\u003e65535 is the default for loopback (65536), so the panic is reliably triggerable; stream-reset must be enabled but that is a deployment condition, not an attacker-uncontrollable one.\nPR:N - Sending the RECONF chunk only requires an established SCTP association, which any peer can set up without authentication or credentials; the bug is reached during normal association-scoped packet processing.\nUI:N - No victim interaction is needed; the attacker simply sends a crafted RECONF chunk to an established association.\nS:U - The crash occurs within the kernel\u0027s own security scope with no crossing of a security boundary such as VM or IOMMU.\nC:N - The bug is a controlled BUG()/skb_over_panic that aborts before any out-of-bounds access, disclosing no memory contents.\nI:N - The panic fires before the oversized copy executes, so no memory is written or modified out of bounds.\nA:H - The undersized skb allocation causes skb_put to invoke skb_over_panic \u2192 BUG(), producing a kernel panic (denial of service)."
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        {
          "url": "https://git.kernel.org/stable/c/18ae07691d43183d270de8be9dc8e027906015d9"
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      "title": "sctp: validate stream count in sctp_process_strreset_inreq()",
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    "cveId": "CVE-2026-68315",
    "datePublished": "2026-08-10T12:02:50.156Z",
    "dateReserved": "2026-07-30T09:28:09.382Z",
    "dateUpdated": "2026-08-19T16:33:08.206Z",
    "state": "PUBLISHED"
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: validate stream count in sctp_process_strreset_inreq()\n\nWhen processing a RESET_IN_REQUEST from a peer,\nsctp_process_strreset_inreq() derives the stream count from the\nparameter length but does not check whether the resulting\nRESET_OUT_REQUEST would exceed SCTP_MAX_CHUNK_LEN.\n\nThe OUT request header (sctp_strreset_outreq, 16 bytes) is 8 bytes\nlarger than the IN request header (sctp_strreset_inreq, 8 bytes).\nGenerally, the IP payload is bounded to 65535 bytes, so the stream\nlist cannot be large enough to trigger the overflow. However, on\ninterfaces with MTU \u003e 65535 (e.g., loopback with IPv6 jumbograms), a\nstream list that fits within the incoming IN parameter can cause a\n__u16 overflow in sctp_make_strreset_req() when computing the OUT\nrequest size, leading to an undersized skb allocation and a kernel\nBUG:\n\n  net/core/skbuff.c:207         skb_panic\n  net/core/skbuff.c:2625        skb_put\n  net/sctp/sm_make_chunk.c:1535 sctp_addto_chunk\n  net/sctp/sm_make_chunk.c:3695 sctp_make_strreset_req\n  net/sctp/stream.c:655         sctp_process_strreset_inreq\n\nThe local setsockopt path validates the generated reset request size.\nHowever, for an incoming-only reset, it accounts for the smaller IN\nrequest even though the peer must generate an OUT request with the same\nstream list. Such a request cannot be completed successfully by the\npeer.\n\nReject peer IN requests whose corresponding OUT request would exceed\nSCTP_MAX_CHUNK_LEN. Also tighten the local check so it does not send an\nIN request that would require an oversized OUT request from the peer."
          }
        ],
        "id": "CVE-2026-68315",
        "lastModified": "2026-08-19T17:20:42.097",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 7.5,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 3.6,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-08-10T13:20:21.440",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/00ae679cb21a035491fdad8d58dc6d79cc68b675"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/18ae07691d43183d270de8be9dc8e027906015d9"
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/60c47dea5d320d2fc706e9aad1db38a04df0a056"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/61327d8e7cfb0259d527be17202630f556213249"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/6f0e39d180cd7cced647381b6fa14fd83d261047"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/7cf7439948e3bf639119119922c88ec190874ca3"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/b255d8cd6cc68045ae9eecbac3b3c14e1f176c9b"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-14T11:48:32+00:00",
      "cve": "CVE-2026-68315",
      "id": "CVE-2026-68315",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:fixed": "453",
      "product_status:known_affected": "98",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: sctp: validate stream count in sctp_process_strreset_inreq()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68315.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-18T00:32:10Z",
      "cve": "CVE-2026-68315",
      "id": "CVE-2026-68315",
      "initial_release_date": "2026-08-11T23:48:14Z",
      "product_status:first_fixed": "23",
      "product_status:known_affected": "725",
      "product_status:known_not_affected": "6",
      "product_status:recommended": "168",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68315",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68315.json",
      "version": "9"
    }
  }
}



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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.