CVE-2026-52929 (GCVE-0-2026-52929)
Vulnerability from cvelistv5
Published
2026-06-24 07:14
Modified
2026-08-05 12:31
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: sctp: stream: fully roll back denied add-stream state When ADD_OUT_STREAMS is denied, SCTP only shrinks the queued chunks and then lowers outcnt. That leaves removed stream metadata behind, so a later re-add can reuse a stale ext and hit a null-pointer dereference in the scheduler get path. Fix the rollback by tearing down the removed stream state the same way other stream resizes do. Unschedule the current scheduler state, drop the removed stream ext state with sctp_stream_outq_migrate(), and then reschedule the remaining streams. This keeps scheduler-private RR/FC/PRIO lists consistent while fully rolling back denied outgoing stream additions.
References
Impacted products
Vendor Product Version
Linux Linux Version: 637784ade221a3c8a7ecd0f583eddd95d6276b9a
Version: 637784ade221a3c8a7ecd0f583eddd95d6276b9a
Version: 637784ade221a3c8a7ecd0f583eddd95d6276b9a
Version: 637784ade221a3c8a7ecd0f583eddd95d6276b9a
Version: 637784ade221a3c8a7ecd0f583eddd95d6276b9a
Version: 637784ade221a3c8a7ecd0f583eddd95d6276b9a
Version: 637784ade221a3c8a7ecd0f583eddd95d6276b9a
Version: 637784ade221a3c8a7ecd0f583eddd95d6276b9a
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sctp/stream.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "4.15"
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              "status": "unaffected",
              "version": "0",
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              "version": "5.15.210",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.1.176",
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              "status": "unaffected",
              "version": "6.6.143",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.12.94",
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              "status": "unaffected",
              "version": "6.18.36",
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            },
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              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.259",
                  "versionStartIncluding": "4.15",
                  "vulnerable": true
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                  "versionEndExcluding": "5.15.210",
                  "versionStartIncluding": "4.15",
                  "vulnerable": true
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.176",
                  "versionStartIncluding": "4.15",
                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.143",
                  "versionStartIncluding": "4.15",
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "4.15",
                  "vulnerable": true
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                {
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                  "versionStartIncluding": "4.15",
                  "vulnerable": true
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: stream: fully roll back denied add-stream state\n\nWhen ADD_OUT_STREAMS is denied, SCTP only shrinks the queued chunks and\nthen lowers outcnt. That leaves removed stream metadata behind, so a\nlater re-add can reuse a stale ext and hit a null-pointer dereference in\nthe scheduler get path.\n\nFix the rollback by tearing down the removed stream state the same way\nother stream resizes do. Unschedule the current scheduler state, drop\nthe removed stream ext state with sctp_stream_outq_migrate(), and then\nreschedule the remaining streams.\n\nThis keeps scheduler-private RR/FC/PRIO lists consistent while fully\nrolling back denied outgoing stream additions."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The vulnerable code is reached while processing an SCTP RE-CONFIG response chunk received from a remote SCTP peer on an established association. A malicious peer can send a denied ADD_OUT_STREAMS response over the network once stream reconfiguration is negotiated.\nAC:L - The packet/state sequence is protocol-controlled and reproducible: negotiate SCTP RE-CONFIG, trigger an ADD_OUT_STREAMS request, deny it, then cause later reuse of the stale stream state. Although RE-CONFIG must be enabled by the application, there is no race or condition outside the attacker\u0027s reasonable influence in a deployment using this feature.\nPR:N - A remote SCTP peer does not need local kernel privileges or authenticated OS privileges to send the denial response. The path is gated by SCTP association state, verification tag, and matching outstanding request sequence, not by credentials.\nUI:N - No human user interaction is required once the SCTP service/association is operating with stream reconfiguration. The triggering input is network protocol traffic from the peer.\nS:U - The vulnerability affects kernel SCTP state within the same host security authority. It does not cross a VM, IOMMU, or other separate authorization boundary.\nC:N - The investigated failure mode is stale SCTP stream scheduler metadata leading to a NULL pointer dereference in scheduler value retrieval. I did not find evidence of an attacker-controlled memory read or information disclosure primitive.\nI:N - The bug leaves scheduler-private stream state inconsistent but the demonstrated impact is a NULL dereference/crash, not controlled data modification or code execution. No arbitrary write primitive was evident from the rollback path.\nA:H - The stale stream extension state can lead to a kernel NULL pointer dereference/oops in the SCTP scheduler path. A remotely reachable kernel crash is a high availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:31:47.863Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0cd2dc6dce8ca47212cd306ccd52eb315ef3cf85"
        },
        {
          "url": "https://git.kernel.org/stable/c/a6724b7b812ac8793514a1d5938db5d9d29ae725"
        },
        {
          "url": "https://git.kernel.org/stable/c/9662eb0401518f0b4681f10e7fbf688f504f24cf"
        },
        {
          "url": "https://git.kernel.org/stable/c/7dd9a42b044aad2dbe037db1c1e2943582485b44"
        },
        {
          "url": "https://git.kernel.org/stable/c/39dc2b0eb5371a669ebc9ec6072b9184eac95418"
        },
        {
          "url": "https://git.kernel.org/stable/c/d5ea0b3e261fcb2cfff142675516165244cab1da"
        },
        {
          "url": "https://git.kernel.org/stable/c/1c6773b8c081509dcd5cd2954f2b02c50c00f151"
        },
        {
          "url": "https://git.kernel.org/stable/c/a5f8a90ac9f77c678a9781c0a464b635e0d63e49"
        }
      ],
      "title": "sctp: stream: fully roll back denied add-stream state",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-52929",
    "datePublished": "2026-06-24T07:14:22.020Z",
    "dateReserved": "2026-06-09T07:44:35.368Z",
    "dateUpdated": "2026-08-05T12:31:47.863Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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