CVE-2026-74688 (GCVE-0-2026-74688)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:32 – Updated: 2026-08-25 05:41
VLAI
Title
sctp: clear control chunk transport if it is being removed
Summary
In the Linux kernel, the following vulnerability has been resolved: sctp: clear control chunk transport if it is being removed sctp_make_heartbeat_ack() caches the destination transport in chunk->transport without taking a reference. When src_out_of_asoc_ok is enabled, the HEARTBEAT ACK may remain queued on control_chunk_list instead of being transmitted immediately. If the peer transport is removed while the chunk is still queued, sctp_assoc_rm_peer() drops the transport and schedules it for RCU freeing, but only clears cached transport pointers in out_chunk_list. The queued control chunk therefore retains a dangling transport pointer. Once an ASCONF_ACK clears the suppression and the queued control chunk is transmitted, SCTP dereferences the stale transport pointer, leading to a use-after-free. Fix this by also clearing chunk->transport for queued control chunks in control_chunk_list when removing the transport.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 8a07eb0a50aebc8c95478d49c28c7f8419a26cef , < dbb3f418a8665ffb0514e1a9520ab6a1c5d4d886 (git)
Affected: 8a07eb0a50aebc8c95478d49c28c7f8419a26cef , < fad4766a74220fe579c6fcaa10ba01c23529814f (git)
Affected: 8a07eb0a50aebc8c95478d49c28c7f8419a26cef , < 936658ec41c28c397ef390140e02d4c91ade92f0 (git)
Affected: 8a07eb0a50aebc8c95478d49c28c7f8419a26cef , < 8de65194a04d2552cd39b6c67d942d490f22d174 (git)
Affected: 8a07eb0a50aebc8c95478d49c28c7f8419a26cef , < 6160e756db81d6cb63e3e2952efcf6c5134be385 (git)
Affected: 8a07eb0a50aebc8c95478d49c28c7f8419a26cef , < 18d704bdd809377dfd81a3c2f42426763b5da227 (git)
Affected: 8a07eb0a50aebc8c95478d49c28c7f8419a26cef , < 4d6b9cac6df5e0cfef1a66b3edd7aebdb9e4b7e7 (git)
Affected: 8a07eb0a50aebc8c95478d49c28c7f8419a26cef , < c9158ceaf27780ef64534ad72f44ffde3f8ccc49 (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.1
Unaffected: 0 , < 3.1 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.152 , ≤ 6.6.* (semver)
Unaffected: 6.12.104 , ≤ 6.12.* (semver)
Unaffected: 6.18.45 , ≤ 6.18.* (semver)
Unaffected: 7.1.9 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: clear control chunk transport if it is being removed\n\nsctp_make_heartbeat_ack() caches the destination transport in\nchunk-\u003etransport without taking a reference. When src_out_of_asoc_ok is\nenabled, the HEARTBEAT ACK may remain queued on control_chunk_list instead\nof being transmitted immediately.\n\nIf the peer transport is removed while the chunk is still queued,\nsctp_assoc_rm_peer() drops the transport and schedules it for RCU freeing,\nbut only clears cached transport pointers in out_chunk_list.  The queued\ncontrol chunk therefore retains a dangling transport pointer.\n\nOnce an ASCONF_ACK clears the suppression and the queued control chunk is\ntransmitted, SCTP dereferences the stale transport pointer, leading to a\nuse-after-free.\n\nFix this by also clearing chunk-\u003etransport for queued control chunks in\ncontrol_chunk_list when removing the transport."
        }
      ],
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            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
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              "value": "AV:N - The bug is reached from remotely received SCTP packets (HEARTBEAT, ASCONF, ASCONF_ACK) processed in sctp_rcv() and the association input state machine on internet-facing SCTP servers and telecom endpoints.\nAC:L - A remote SCTP peer controls packet sequencing and can send HEARTBEAT while src_out_of_asoc_ok blocks transmission, remove transports via ASCONF DEL_IP, then trigger flush when ASCONF_ACK clears suppression.\nPR:N - Exploitation requires only a network-reachable established SCTP association; the attacker needs no Linux credentials, capabilities, or namespaces\u2014only the ability to send valid SCTP traffic to the target.\nUI:N - No victim user action is required; the use-after-free is triggered entirely by SCTP protocol messages sent by a remote peer during normal association operation or address migration.\nS:U - Impact is confined to kernel memory corruption and privilege escalation within the host kernel; it does not cross VM, container, or IOMMU security boundaries.\nC:H - Stale chunk-\u003etransport pointers dereference RCU-freed sctp_transport objects in sctp_outq_select_transport() and sctp_packet_transmit(), a use-after-free that enables arbitrary kernel memory disclosure via heap grooming.\nI:H - Use-after-free of sctp_transport allows controlled reuse of freed kmalloc objects, providing a standard path to arbitrary kernel writes and local privilege escalation or remote code execution in kernel context.\nA:H - Dereferencing the freed transport during control-chunk transmission can immediately kernel oops or panic the system; use-after-free bugs inherently threaten availability even when full exploitation is not attempted."
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "dateReserved": "2026-08-15T05:44:03.926Z",
    "dateUpdated": "2026-08-25T05:41:32.712Z",
    "state": "PUBLISHED"
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      "date": "2026-08-29",
      "epss": "0.005",
      "percentile": "0.40644"
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      "cve": "CVE-2026-74688",
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      "source": "Microsoft CSAF VEX",
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      "title": "sctp: clear control chunk transport if it is being removed",
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      "version": "2"
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The queued\\ncontrol chunk therefore retains a dangling transport pointer.\\n\\nOnce an ASCONF_ACK clears the suppression and the queued control chunk is\\ntransmitted, SCTP dereferences the stale transport pointer, leading to a\\nuse-after-free.\\n\\nFix this by also clearing chunk-\u003etransport for queued control chunks in\\ncontrol_chunk_list when removing the transport.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/sctp/associola.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"8a07eb0a50aebc8c95478d49c28c7f8419a26cef\",\"lessThan\":\"dbb3f418a8665ffb0514e1a9520ab6a1c5d4d886\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8a07eb0a50aebc8c95478d49c28c7f8419a26cef\",\"lessThan\":\"fad4766a74220fe579c6fcaa10ba01c23529814f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8a07eb0a50aebc8c95478d49c28c7f8419a26cef\",\"lessThan\":\"936658ec41c28c397ef390140e02d4c91ade92f0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8a07eb0a50aebc8c95478d49c28c7f8419a26cef\",\"lessThan\":\"8de65194a04d2552cd39b6c67d942d490f22d174\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8a07eb0a50aebc8c95478d49c28c7f8419a26cef\",\"lessThan\":\"6160e756db81d6cb63e3e2952efcf6c5134be385\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8a07eb0a50aebc8c95478d49c28c7f8419a26cef\",\"lessThan\":\"18d704bdd809377dfd81a3c2f42426763b5da227\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8a07eb0a50aebc8c95478d49c28c7f8419a26cef\",\"lessThan\":\"4d6b9cac6df5e0cfef1a66b3edd7aebdb9e4b7e7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8a07eb0a50aebc8c95478d49c28c7f8419a26cef\",\"lessThan\":\"c9158ceaf27780ef64534ad72f44ffde3f8ccc49\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/sctp/associola.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.1\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.1\",\"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\":\"6.6.152\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.104\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.45\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.9\",\"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:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/18d704bdd809377dfd81a3c2f42426763b5da227\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4d6b9cac6df5e0cfef1a66b3edd7aebdb9e4b7e7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6160e756db81d6cb63e3e2952efcf6c5134be385\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8de65194a04d2552cd39b6c67d942d490f22d174\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/936658ec41c28c397ef390140e02d4c91ade92f0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c9158ceaf27780ef64534ad72f44ffde3f8ccc49\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dbb3f418a8665ffb0514e1a9520ab6a1c5d4d886\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fad4766a74220fe579c6fcaa10ba01c23529814f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-25T08:54:15+00:00",
      "cve": "CVE-2026-74688",
      "id": "CVE-2026-74688",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: sctp: clear control chunk transport if it is being removed",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74688.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-08-23T00:04:34Z",
      "cve": "CVE-2026-74688",
      "id": "CVE-2026-74688",
      "initial_release_date": "2026-08-23T00:04:34Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74688",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74688.json",
      "version": "2"
    }
  }
}



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  • 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.