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CVE-2026-74588 (GCVE-0-2026-74588)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:31 – Updated: 2026-08-25 05:40
VLAI
Title
sctp: keep chunk->transport in step with the list it is queued on
Summary
In the Linux kernel, the following vulnerability has been resolved: sctp: keep chunk->transport in step with the list it is queued on __sctp_outq_flush_rtx() moves a gap-acked chunk onto another transport's transmitted list without updating chunk->transport: if (chunk->tsn_gap_acked) { list_move_tail(&chunk->transmitted_list, &transport->transmitted); continue; } The chunk then sits on a live transport's list while chunk->transport still names a different one. If that transport is removed - sctp_assoc_rm_peer() from an ASCONF Delete-IP - sctp_transport_free() RCU-frees it and the chunk is left with a dangling pointer. sctp_assoc_rm_peer() scrubs peer->transmitted and asoc->outqueue.out_chunk_list, but the chunk is on neither. The pointer is not followed while tsn_gap_acked is set. A SACK that reneges on the TSN clears the flag, and the next SACK reaches tchunk->transport->flight_size -= sctp_data_size(tchunk); inside the freed transport. KASAN reports a slab-use-after-free read in sctp_check_transmitted(), freed from sctp_assoc_rm_peer(). Both the removal and the SACKs come from the association peer. Set chunk->transport at the move. The ordinary resend path needs nothing: it reaches its list_move_tail() only after sctp_packet_append_chunk() returned SCTP_XMIT_OK, and __sctp_packet_append_chunk() has rebound the chunk by then. Discovered by XBOW, triaged by Baul Lee <baul.lee@xbow.com>
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: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 6575fb17230814b48b471727c8410c0aadff9274 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 6b9e2ea2057113f3393990ba646d2d97c719a80d (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 874a7c2b5e184f06134fdfde27e9ce9271bafe58 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 1adf929121e13e0b19200bb9fef715b918d483fe (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e2e7c1de0e226ca1b7fea2de57a6c9bca408709b (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2b3b5eec8b2c30ee237e3c31a6a38de9c39d804d (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 5ccf35ef0ed6059cdf8b1f4606a6584d5b67166b (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 9f2cf069a9a72a2d6b97ca8b4c70e714aac99749 (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (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)
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: keep chunk-\u003etransport in step with the list it is queued on\n\n__sctp_outq_flush_rtx() moves a gap-acked chunk onto another transport\u0027s\ntransmitted list without updating chunk-\u003etransport:\n\n\tif (chunk-\u003etsn_gap_acked) {\n\t\tlist_move_tail(\u0026chunk-\u003etransmitted_list,\n\t\t\t       \u0026transport-\u003etransmitted);\n\t\tcontinue;\n\t}\n\nThe chunk then sits on a live transport\u0027s list while chunk-\u003etransport still\nnames a different one.  If that transport is removed - sctp_assoc_rm_peer()\nfrom an ASCONF Delete-IP - sctp_transport_free() RCU-frees it and the chunk\nis left with a dangling pointer.  sctp_assoc_rm_peer() scrubs\npeer-\u003etransmitted and asoc-\u003eoutqueue.out_chunk_list, but the chunk is on\nneither.\n\nThe pointer is not followed while tsn_gap_acked is set.  A SACK that\nreneges on the TSN clears the flag, and the next SACK reaches\n\n\ttchunk-\u003etransport-\u003eflight_size -= sctp_data_size(tchunk);\n\ninside the freed transport.  KASAN reports a slab-use-after-free read in\nsctp_check_transmitted(), freed from sctp_assoc_rm_peer().  Both the\nremoval and the SACKs come from the association peer.\n\nSet chunk-\u003etransport at the move.  The ordinary resend path needs nothing:\nit reaches its list_move_tail() only after sctp_packet_append_chunk()\nreturned SCTP_XMIT_OK, and __sctp_packet_append_chunk() has rebound the\nchunk by then.\n\nDiscovered by XBOW, triaged by Baul Lee \u003cbaul.lee@xbow.com\u003e"
        }
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            "baseScore": 9.8,
            "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"
          },
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              "value": "AV:N - The bug is reached when the kernel SCTP stack processes inbound SACK and ASCONF chunks from a remote association peer via sctp_rcv()/sctp_inq_push(), with no local syscall or ioctl required on the victim.\nAC:L - The remote peer controls the SCTP protocol sequence (gap SACKs, ADDIP multihoming, ASCONF Delete-IP, and SACK reneging) needed to strand a chunk and free its transport; no attacker-uncontrollable race or rare memory layout is required.\nPR:N - Exploitation requires only network access as an established SCTP association peer sending authenticated protocol traffic; no local Linux account, capability, or namespace privilege is needed on the victim host.\nUI:N - No victim user action is required beyond normal automated SCTP server/client operation; the attacker drives the entire trigger sequence with crafted SACK and ASCONF packets on the existing association.\nS:U - Impact is confined to kernel memory corruption and potential privilege escalation within the host kernel; it does not cross a VM, container, or IOMMU security boundary.\nC:H - KASAN reports a slab use-after-free read through dangling chunk-\u003etransport in sctp_check_transmitted(); UAF on sctp_transport objects can be groomed for arbitrary kernel memory disclosure.\nI:H - The UAF dereference performs flight_size arithmetic on a freed sctp_transport slab object, enabling heap grooming and arbitrary kernel write or control-flow hijack primitives typical of SCTP transport UAFs.\nA:H - Accessing freed transport memory during SACK processing can cause kernel oops/panic and repeatable remote denial of service against any SCTP endpoint handling the malicious peer traffic."
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/6b9e2ea2057113f3393990ba646d2d97c719a80d"
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        {
          "url": "https://git.kernel.org/stable/c/9f2cf069a9a72a2d6b97ca8b4c70e714aac99749"
        }
      ],
      "title": "sctp: keep chunk-\u003etransport in step with the list it is queued on",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74588",
    "datePublished": "2026-08-22T15:31:40.466Z",
    "dateReserved": "2026-08-15T05:44:03.918Z",
    "dateUpdated": "2026-08-25T05:40:15.097Z",
    "state": "PUBLISHED"
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      "cve": "CVE-2026-74588",
      "date": "2026-09-17",
      "epss": "0.005",
      "percentile": "0.41665"
    },
    "microsoft_vex": {
      "current_release_date": "2026-09-11T01:51:07.000Z",
      "cve": "CVE-2026-74588",
      "id": "msrc_CVE-2026-74588",
      "initial_release_date": "2026-08-24T01:08:27.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "sctp: keep chunk-\u003etransport in step with the list it is queued on",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74588.json",
      "version": "3"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-74588\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-22T16:16:30.960\",\"lastModified\":\"2026-08-25T06:18:33.410\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsctp: keep chunk-\u003etransport in step with the list it is queued on\\n\\n__sctp_outq_flush_rtx() moves a gap-acked chunk onto another transport\u0027s\\ntransmitted list without updating chunk-\u003etransport:\\n\\n\\tif (chunk-\u003etsn_gap_acked) {\\n\\t\\tlist_move_tail(\u0026chunk-\u003etransmitted_list,\\n\\t\\t\\t       \u0026transport-\u003etransmitted);\\n\\t\\tcontinue;\\n\\t}\\n\\nThe chunk then sits on a live transport\u0027s list while chunk-\u003etransport still\\nnames a different one.  If that transport is removed - sctp_assoc_rm_peer()\\nfrom an ASCONF Delete-IP - sctp_transport_free() RCU-frees it and the chunk\\nis left with a dangling pointer.  sctp_assoc_rm_peer() scrubs\\npeer-\u003etransmitted and asoc-\u003eoutqueue.out_chunk_list, but the chunk is on\\nneither.\\n\\nThe pointer is not followed while tsn_gap_acked is set.  A SACK that\\nreneges on the TSN clears the flag, and the next SACK reaches\\n\\n\\ttchunk-\u003etransport-\u003eflight_size -= sctp_data_size(tchunk);\\n\\ninside the freed transport.  KASAN reports a slab-use-after-free read in\\nsctp_check_transmitted(), freed from sctp_assoc_rm_peer().  Both the\\nremoval and the SACKs come from the association peer.\\n\\nSet chunk-\u003etransport at the move.  The ordinary resend path needs nothing:\\nit reaches its list_move_tail() only after sctp_packet_append_chunk()\\nreturned SCTP_XMIT_OK, and __sctp_packet_append_chunk() has rebound the\\nchunk by then.\\n\\nDiscovered by XBOW, triaged by Baul Lee \u003cbaul.lee@xbow.com\u003e\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/sctp/outqueue.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"6575fb17230814b48b471727c8410c0aadff9274\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"6b9e2ea2057113f3393990ba646d2d97c719a80d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"874a7c2b5e184f06134fdfde27e9ce9271bafe58\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"1adf929121e13e0b19200bb9fef715b918d483fe\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"e2e7c1de0e226ca1b7fea2de57a6c9bca408709b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"2b3b5eec8b2c30ee237e3c31a6a38de9c39d804d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"5ccf35ef0ed6059cdf8b1f4606a6584d5b67166b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"9f2cf069a9a72a2d6b97ca8b4c70e714aac99749\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/sctp/outqueue.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.12\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.12\",\"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/1adf929121e13e0b19200bb9fef715b918d483fe\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2b3b5eec8b2c30ee237e3c31a6a38de9c39d804d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5ccf35ef0ed6059cdf8b1f4606a6584d5b67166b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6575fb17230814b48b471727c8410c0aadff9274\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6b9e2ea2057113f3393990ba646d2d97c719a80d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/874a7c2b5e184f06134fdfde27e9ce9271bafe58\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9f2cf069a9a72a2d6b97ca8b4c70e714aac99749\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e2e7c1de0e226ca1b7fea2de57a6c9bca408709b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-09-03T18:59:14+00:00",
      "cve": "CVE-2026-74588",
      "id": "CVE-2026-74588",
      "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: keep chunk-\u003etransport in step with the list it is queued on",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74588.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-15T01:18:21Z",
      "cve": "CVE-2026-74588",
      "id": "CVE-2026-74588",
      "initial_release_date": "2026-08-23T00:06:26Z",
      "product_status:known_affected": "353",
      "product_status:known_not_affected": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74588",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74588.json",
      "version": "6"
    }
  }
}



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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.