CVE-2026-68320 (GCVE-0-2026-68320)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:02 – Updated: 2026-08-19 16:33
VLAI
Title
sctp: fix auth_chunk_list capacity check in sctp_auth_ep_add_chunkid
Summary
In the Linux kernel, the following vulnerability has been resolved: sctp: fix auth_chunk_list capacity check in sctp_auth_ep_add_chunkid sctp_auth_ep_add_chunkid() uses SCTP_NUM_CHUNK_TYPES (20) as the capacity limit for ep->auth_chunk_list, allowing it to hold up to 20 chunk entries (param_hdr.length up to 24). However, the copy destination asoc->c.auth_chunks in struct sctp_cookie is only SCTP_AUTH_MAX_CHUNKS (16) entries (20 bytes). When more than 16 chunks are added, sctp_association_init() memcpy overflows the destination by up to 4 bytes. Fix by using SCTP_AUTH_MAX_CHUNKS as the capacity limit, matching the destination capacity.
Severity
7.3 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1f485649f52929d9937b346a920a522a7363e202 , < 3d22a7da2e264f407c729f33a0a346ff76108bc6 (git)
Affected: 1f485649f52929d9937b346a920a522a7363e202 , < 6837c1c19a259518974cbc5a52017646e3906564 (git)
Affected: 1f485649f52929d9937b346a920a522a7363e202 , < 54bb4c03fa17cdcb157c26c33e60a78cf32960f5 (git)
Affected: 1f485649f52929d9937b346a920a522a7363e202 , < 5a365f1e423444c5da7eb689a8661633dad43e48 (git)
Affected: 1f485649f52929d9937b346a920a522a7363e202 , < 886e28e14ab655012779016d251fef53d103aa12 (git)
Affected: 1f485649f52929d9937b346a920a522a7363e202 , < 11092d79eb2b7c0068382f72fc2416d1786bb2e0 (git)
Affected: 1f485649f52929d9937b346a920a522a7363e202 , < b6ea3dda09eb4d5caf7bbc00f857688cf9e98255 (git)
Affected: 1f485649f52929d9937b346a920a522a7363e202 , < ff04b26794a16a8a879eb4fd2c02c2d6b03850e9 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.24
Unaffected: 0 , < 2.6.24 (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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          "lang": "en",
          "value": "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-\u003eauth_chunk_list, allowing it to hold up to\n20 chunk entries (param_hdr.length up to 24). However, the copy\ndestination asoc-\u003ec.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."
        }
      ],
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H",
            "version": "3.1"
          },
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              "lang": "en",
              "value": "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\u0027s 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-\u003elength) 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-\u003ec.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."
            }
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        "dateUpdated": "2026-08-19T16:33:10.661Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "title": "sctp: fix auth_chunk_list capacity check in sctp_auth_ep_add_chunkid",
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    "cveId": "CVE-2026-68320",
    "datePublished": "2026-08-10T12:02:55.144Z",
    "dateReserved": "2026-07-30T09:28:09.382Z",
    "dateUpdated": "2026-08-19T16:33:10.661Z",
    "state": "PUBLISHED"
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/sctp/auth.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"1f485649f52929d9937b346a920a522a7363e202\",\"lessThan\":\"3d22a7da2e264f407c729f33a0a346ff76108bc6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1f485649f52929d9937b346a920a522a7363e202\",\"lessThan\":\"6837c1c19a259518974cbc5a52017646e3906564\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1f485649f52929d9937b346a920a522a7363e202\",\"lessThan\":\"54bb4c03fa17cdcb157c26c33e60a78cf32960f5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1f485649f52929d9937b346a920a522a7363e202\",\"lessThan\":\"5a365f1e423444c5da7eb689a8661633dad43e48\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1f485649f52929d9937b346a920a522a7363e202\",\"lessThan\":\"886e28e14ab655012779016d251fef53d103aa12\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1f485649f52929d9937b346a920a522a7363e202\",\"lessThan\":\"11092d79eb2b7c0068382f72fc2416d1786bb2e0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1f485649f52929d9937b346a920a522a7363e202\",\"lessThan\":\"b6ea3dda09eb4d5caf7bbc00f857688cf9e98255\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1f485649f52929d9937b346a920a522a7363e202\",\"lessThan\":\"ff04b26794a16a8a879eb4fd2c02c2d6b03850e9\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/sctp/auth.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.24\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.24\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.148\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.101\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.42\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.6\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H\",\"baseScore\":7.3,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.5}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/11092d79eb2b7c0068382f72fc2416d1786bb2e0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3d22a7da2e264f407c729f33a0a346ff76108bc6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/54bb4c03fa17cdcb157c26c33e60a78cf32960f5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5a365f1e423444c5da7eb689a8661633dad43e48\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6837c1c19a259518974cbc5a52017646e3906564\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/886e28e14ab655012779016d251fef53d103aa12\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b6ea3dda09eb4d5caf7bbc00f857688cf9e98255\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ff04b26794a16a8a879eb4fd2c02c2d6b03850e9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-14T05:59:29+00:00",
      "cve": "CVE-2026-68320",
      "id": "CVE-2026-68320",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:known_affected": "275",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: sctp: fix auth_chunk_list capacity check in sctp_auth_ep_add_chunkid",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68320.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-11T23:48:01Z",
      "cve": "CVE-2026-68320",
      "id": "CVE-2026-68320",
      "initial_release_date": "2026-08-11T23:48:01Z",
      "product_status:known_affected": "296",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68320",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68320.json",
      "version": "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.

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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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