CVE-2026-74587 (GCVE-0-2026-74587)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:31 – Updated: 2026-08-25 05:40
VLAI
Title
sctp: fix use-after-free of cached ASCONF chunk
Summary
In the Linux kernel, the following vulnerability has been resolved: sctp: fix use-after-free of cached ASCONF chunk addip_last_asconf caches the outstanding outbound ASCONF chunk. The normal ASCONF-ACK completion path releases the chunk and clears the pointer. However, sctp_asconf_queue_teardown() releases the cached chunk without clearing addip_last_asconf. During peer restart handling, sctp_sf_do_dupcook_a() queues SCTP_CMD_PURGE_ASCONF_QUEUE, which invokes sctp_asconf_queue_teardown() while the association remains alive and leaves the pointer dangling. A delayed authenticated ASCONF-ACK can then reach sctp_sf_do_asconf_ack(), which accesses the stale chunk and passes it to sctp_process_asconf_ack(), causing a use-after-free and a second release. Clearing the pointer exposes a race with T4 expiry. Peer restart handling queues the timer stop before the purge, but SCTP_CMD_TIMER_STOP uses timer_delete(), which does not wait for a callback already running on another CPU. Such a callback can reach sctp_sf_t4_timer_expire() after the purge and dereference NULL. Clear addip_last_asconf after releasing the cached chunk, and make sctp_sf_t4_timer_expire() consume a stale T4 expiry if no outstanding ASCONF remains.
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: a000c01e60e40e15304ffe48fff051d17a7bea91 , < 10459b03e2d9ee12435e96f587de4d4cacdbf435 (git)
Affected: a000c01e60e40e15304ffe48fff051d17a7bea91 , < e1bb114e09372fd6e03387ced9ef566da336ed6c (git)
Affected: a000c01e60e40e15304ffe48fff051d17a7bea91 , < 179676f0166230c80053a392303485b37c93dd33 (git)
Affected: a000c01e60e40e15304ffe48fff051d17a7bea91 , < dc67d528c2fa939cec7fe3bf7f3089c8d281ca3d (git)
Affected: a000c01e60e40e15304ffe48fff051d17a7bea91 , < 618b5c6d049896fcfabb91afc072954c92cb2693 (git)
Affected: a000c01e60e40e15304ffe48fff051d17a7bea91 , < 07daf4f9750104960a1d60831b2353c0d41f35fb (git)
Affected: a000c01e60e40e15304ffe48fff051d17a7bea91 , < d949992bc3f00027a2c755e860a11950c75f6073 (git)
Affected: a000c01e60e40e15304ffe48fff051d17a7bea91 , < 8c283e7b56adce00193837f3311b06662466fb21 (git)
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Linux Linux Affected: 3.0
Unaffected: 0 , < 3.0 (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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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: fix use-after-free of cached ASCONF chunk\n\naddip_last_asconf caches the outstanding outbound ASCONF chunk. The normal\nASCONF-ACK completion path releases the chunk and clears the pointer.\n\nHowever, sctp_asconf_queue_teardown() releases the cached chunk without\nclearing addip_last_asconf. During peer restart handling,\nsctp_sf_do_dupcook_a() queues SCTP_CMD_PURGE_ASCONF_QUEUE, which invokes\nsctp_asconf_queue_teardown() while the association remains alive and leaves\nthe pointer dangling.\n\nA delayed authenticated ASCONF-ACK can then reach sctp_sf_do_asconf_ack(),\nwhich accesses the stale chunk and passes it to sctp_process_asconf_ack(),\ncausing a use-after-free and a second release.\n\nClearing the pointer exposes a race with T4 expiry. Peer restart handling\nqueues the timer stop before the purge, but SCTP_CMD_TIMER_STOP uses\ntimer_delete(), which does not wait for a callback already running on\nanother CPU. Such a callback can reach sctp_sf_t4_timer_expire() after\nthe purge and dereference NULL.\n\nClear addip_last_asconf after releasing the cached chunk, and make\nsctp_sf_t4_timer_expire() consume a stale T4 expiry if no outstanding\nASCONF remains."
        }
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      "metrics": [
        {
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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"
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              "lang": "en",
              "value": "AV:N - The UAF is triggered when the kernel processes inbound SCTP COOKIE-ECHO (peer restart) and ASCONF-ACK chunks from a remote association peer via sctp_rcv()/sctp_inq_push()/sctp_do_sm(), with no local syscall required on the victim.\nAC:L - The remote SCTP peer controls the full protocol sequence\u2014establishing an ADDIP-capable association, waiting for the victim\u0027s outstanding ASCONF, sending COOKIE-ECHO restart to purge queues, then delivering a delayed authenticated ASCONF-ACK\u2014without attacker-uncontrollable races or memory layout.\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 COOKIE-ECHO and ASCONF-ACK 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 - sctp_sf_do_asconf_ack() and sctp_process_asconf_ack() dereference the stale addip_last_asconf pointer to read freed sctp_chunk and skb metadata; UAF on slab-allocated chunk objects enables heap grooming for arbitrary kernel memory disclosure.\nI:H - The stale pointer causes sctp_process_asconf_ack() to perform a second sctp_chunk_free() on an already-freed chunk, yielding a kmem_cache double-free that can be leveraged for arbitrary kernel write or control-flow hijack.\nA:H - Dereferencing the freed cached ASCONF chunk during ASCONF-ACK 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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        {
          "url": "https://git.kernel.org/stable/c/8c283e7b56adce00193837f3311b06662466fb21"
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      "title": "sctp: fix use-after-free of cached ASCONF chunk",
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    "dateReserved": "2026-08-15T05:44:03.918Z",
    "dateUpdated": "2026-08-25T05:40:13.798Z",
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      "product_status:known_affected": "1",
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      "status": "final",
      "title": "sctp: fix use-after-free of cached ASCONF chunk",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74587.json",
      "version": "2"
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During peer restart handling,\\nsctp_sf_do_dupcook_a() queues SCTP_CMD_PURGE_ASCONF_QUEUE, which invokes\\nsctp_asconf_queue_teardown() while the association remains alive and leaves\\nthe pointer dangling.\\n\\nA delayed authenticated ASCONF-ACK can then reach sctp_sf_do_asconf_ack(),\\nwhich accesses the stale chunk and passes it to sctp_process_asconf_ack(),\\ncausing a use-after-free and a second release.\\n\\nClearing the pointer exposes a race with T4 expiry. Peer restart handling\\nqueues the timer stop before the purge, but SCTP_CMD_TIMER_STOP uses\\ntimer_delete(), which does not wait for a callback already running on\\nanother CPU. Such a callback can reach sctp_sf_t4_timer_expire() after\\nthe purge and dereference NULL.\\n\\nClear addip_last_asconf after releasing the cached chunk, and make\\nsctp_sf_t4_timer_expire() consume a stale T4 expiry if no outstanding\\nASCONF remains.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/sctp/associola.c\",\"net/sctp/sm_statefuns.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"a000c01e60e40e15304ffe48fff051d17a7bea91\",\"lessThan\":\"10459b03e2d9ee12435e96f587de4d4cacdbf435\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a000c01e60e40e15304ffe48fff051d17a7bea91\",\"lessThan\":\"e1bb114e09372fd6e03387ced9ef566da336ed6c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a000c01e60e40e15304ffe48fff051d17a7bea91\",\"lessThan\":\"179676f0166230c80053a392303485b37c93dd33\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a000c01e60e40e15304ffe48fff051d17a7bea91\",\"lessThan\":\"dc67d528c2fa939cec7fe3bf7f3089c8d281ca3d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a000c01e60e40e15304ffe48fff051d17a7bea91\",\"lessThan\":\"618b5c6d049896fcfabb91afc072954c92cb2693\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a000c01e60e40e15304ffe48fff051d17a7bea91\",\"lessThan\":\"07daf4f9750104960a1d60831b2353c0d41f35fb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a000c01e60e40e15304ffe48fff051d17a7bea91\",\"lessThan\":\"d949992bc3f00027a2c755e860a11950c75f6073\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a000c01e60e40e15304ffe48fff051d17a7bea91\",\"lessThan\":\"8c283e7b56adce00193837f3311b06662466fb21\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/sctp/associola.c\",\"net/sctp/sm_statefuns.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.0\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.0\",\"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/07daf4f9750104960a1d60831b2353c0d41f35fb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/10459b03e2d9ee12435e96f587de4d4cacdbf435\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/179676f0166230c80053a392303485b37c93dd33\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/618b5c6d049896fcfabb91afc072954c92cb2693\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8c283e7b56adce00193837f3311b06662466fb21\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d949992bc3f00027a2c755e860a11950c75f6073\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dc67d528c2fa939cec7fe3bf7f3089c8d281ca3d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e1bb114e09372fd6e03387ced9ef566da336ed6c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-25T08:49:28+00:00",
      "cve": "CVE-2026-74587",
      "id": "CVE-2026-74587",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:under_investigation": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: sctp: fix use-after-free of cached ASCONF chunk",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74587.json",
      "version": "3"
    }
  }
}



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Tags
Taxonomy of the tags.





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.