{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-68320",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-68320"
  ],
  "published": "2026-08-10T12:08:00Z",
  "summary": "sctp: fix auth_chunk_list capacity check in sctp_auth_ep_add_chunkid",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: fix auth_chunk_list capacity check in sctp_auth_ep_add_chunkid\n\nsctp_auth_ep_add_chunkid() uses SCTP_NUM_CHUNK_TYPES (20) as the\ncapacity limit for ep->auth_chunk_list, allowing it to hold up to\n20 chunk entries (param_hdr.length up to 24). However, the copy\ndestination asoc->c.auth_chunks in struct sctp_cookie is only\nSCTP_AUTH_MAX_CHUNKS (16) entries (20 bytes). When more than 16\nchunks are added, sctp_association_init() memcpy overflows the\ndestination by up to 4 bytes.\n\nFix by using SCTP_AUTH_MAX_CHUNKS as the capacity limit, matching\nthe destination capacity.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H"
    }
  ],
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            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.42"
          },
          "1:6.18.33-1+rpt1": {
            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.42"
          },
          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.42"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.42"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-68320"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3d22a7da2e264f407c729f33a0a346ff76108bc6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6837c1c19a259518974cbc5a52017646e3906564"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/54bb4c03fa17cdcb157c26c33e60a78cf32960f5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5a365f1e423444c5da7eb689a8661633dad43e48"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/886e28e14ab655012779016d251fef53d103aa12"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/11092d79eb2b7c0068382f72fc2416d1786bb2e0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b6ea3dda09eb4d5caf7bbc00f857688cf9e98255"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ff04b26794a16a8a879eb4fd2c02c2d6b03850e9"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-19T16:47:12Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.3,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The overflow condition can only be created locally: an attacker must call setsockopt(SCTP_AUTH_SUPPORTED) and then setsockopt(SCTP_AUTH_CHUNK) more than 16 times on an SCTP socket they own. A remote peer can trigger the memcpy by connecting to such a socket, but cannot itself populate the oversized chunk list.\nAC:L - The sequence is fully deterministic and entirely under attacker control \u2014 enable AUTH, add 17-20 distinct chunk IDs, then create an association via connect() or accept(); no race, timing window, or memory-layout condition is involved.\nPR:L - Creating an IPPROTO_SCTP socket and issuing SCTP_AUTH_SUPPORTED/SCTP_AUTH_CHUNK setsockopts requires no capability; sctp_setsockopt_auth_supported() enables AUTH per-endpoint regardless of the net.sctp.auth_enable sysctl, so any unprivileged local user reaches the bug.\nUI:N - The attacker performs every step from their own process \u2014 socket setup, setsockopt calls, and association establishment \u2014 with no action required from any other user or administrator.\nS:U - The corruption and the over-read are confined to the kernel's own SCTP association object; no other security authority or privilege domain is crossed.\nC:L - sctp_make_init()/sctp_make_init_ack() copy ntohs(auth_chunks->length) bytes from the 20-byte field, emitting up to 4 bytes past it (the adjacent raw_addr_list_len) inside the CHUNKS parameter of INIT/INIT-ACK sent to the remote peer \u2014 a real but small, strictly bounded out-of-bounds read.\nI:H - sctp_association_init() writes up to 4 bytes of fully attacker-chosen data (the chunk-ID values) past the end of asoc->c.auth_chunks into the adjacent kernel struct field, an out-of-bounds write of controlled content into kernel memory.\nA:H - On CONFIG_FORTIFY_SOURCE kernels the memcpy is flagged as a field-spanning write and emits a WARN, which is fatal on the widely used panic_on_warn configurations, and the out-of-bounds write itself corrupts SCTP association state; the trigger is cheap and repeatable by any local user."
    }
  }
}