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CVE-2026-89477 (GCVE-0-2026-89477)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:43 – Updated: 2026-09-14 12:00
VLAI
Title
sctp: fix NULL deref on untransmitted RECONF completion
Summary
In the Linux kernel, the following vulnerability has been resolved: sctp: fix NULL deref on untransmitted RECONF completion sctp_process_strreset_outreq(), sctp_process_strreset_addstrm_out() and sctp_process_strreset_resp() complete a pending stream reconfiguration request by stopping the reconf timer on the transport it was sent on: t = asoc->strreset_chunk->transport; if (timer_delete(&t->reconf_timer)) sctp_transport_put(t); chunk->transport is assigned by __sctp_packet_append_chunk() when the chunk is appended to an outbound packet, and sctp_outq_flush_ctrl() arms the reconf timer at that same point. A request already published in asoc->strreset_chunk but not yet transmitted has neither, so completing it dereferences NULL. Two ways to get there. sctp_send_asconf_del_ip() sets asoc->src_out_of_asoc_ok without sending anything when the address being removed is the association's last one, and sctp_outq_flush_ctrl() then leaves every non-ASCONF control chunk queued; as only sctp_process_asconf_ack() clears that flag, it persists. An unprivileged process that removes such an address and then asks for a stream reset panics the kernel from softirq. A peer needs neither ASCONF nor local help: sctp_cmd_interpreter() uncorks the outqueue only once the whole packet has been processed, so a reply built while walking a RECONF chunk stays untransmitted for the rest of that walk, and one RECONF chunk carrying [Incoming SSN Reset Request, Outgoing SSN Reset Request, Response] -- or two RECONF chunks in one packet -- reaches the same dereference. KASAN: null-ptr-deref in range [0x00000000000001e8-0x00000000000001ef] RIP: 0010:timer_delete+0x67/0x110 Call Trace: <IRQ> sctp_process_strreset_addstrm_out (net/sctp/stream.c:832) sctp_sf_do_reconf (net/sctp/sm_statefuns.c:4212) sctp_do_sm (net/sctp/sm_sideeffect.c:1172) sctp_assoc_bh_rcv (net/sctp/associola.c:1044) sctp_rcv (net/sctp/input.c:243) ip_local_deliver (net/ipv4/ip_input.c:262) process_backlog (net/core/dev.c:6680) </IRQ> A response can only acknowledge a request that was actually sent, so do not match asoc->strreset_chunk while chunk->transport is NULL. Guarding the lookup covers all three completion sites.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 81054476453640159149cb6704e834893e16736b , < 79ff751311e80fa0370007e46a79a6d601685e75 (git)
Affected: 81054476453640159149cb6704e834893e16736b , < 53141db979687eae7dc6d29414cefc77034f967e (git)
Affected: 81054476453640159149cb6704e834893e16736b , < 68891125af5a5dfbca728809a16637a869bbe0df (git)
Affected: 81054476453640159149cb6704e834893e16736b , < b2d6d873b4dfb5b84194061c4b40a1cd85b92ca4 (git)
Affected: 81054476453640159149cb6704e834893e16736b , < 77ea60f2d24002c308f224db44a4542c466489af (git)
Affected: 81054476453640159149cb6704e834893e16736b , < 25419f516ea84b1e7d3d55aae5215ac86ece0c66 (git)
Affected: 81054476453640159149cb6704e834893e16736b , < 0ee697defc0594f1da810ed75d9d643fb46f5318 (git)
Affected: 81054476453640159149cb6704e834893e16736b , < 2db9bfa3e27bdea15e05ea70b56bad3d21e570ec (git)
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Linux Linux Affected: 4.11
Unaffected: 0 , < 4.11 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.109 , ≤ 6.12.* (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: fix NULL deref on untransmitted RECONF completion\n\nsctp_process_strreset_outreq(), sctp_process_strreset_addstrm_out() and\nsctp_process_strreset_resp() complete a pending stream reconfiguration\nrequest by stopping the reconf timer on the transport it was sent on:\n\n\tt = asoc-\u003estrreset_chunk-\u003etransport;\n\tif (timer_delete(\u0026t-\u003ereconf_timer))\n\t\tsctp_transport_put(t);\n\nchunk-\u003etransport is assigned by __sctp_packet_append_chunk() when the\nchunk is appended to an outbound packet, and sctp_outq_flush_ctrl() arms\nthe reconf timer at that same point. A request already published in\nasoc-\u003estrreset_chunk but not yet transmitted has neither, so completing\nit dereferences NULL.\n\nTwo ways to get there. sctp_send_asconf_del_ip() sets\nasoc-\u003esrc_out_of_asoc_ok without sending anything when the address being\nremoved is the association\u0027s last one, and sctp_outq_flush_ctrl() then\nleaves every non-ASCONF control chunk queued; as only\nsctp_process_asconf_ack() clears that flag, it persists. An unprivileged\nprocess that removes such an address and then asks for a stream reset\npanics the kernel from softirq. A peer needs neither ASCONF nor local\nhelp: sctp_cmd_interpreter() uncorks the outqueue only once the whole\npacket has been processed, so a reply built while walking a RECONF chunk\nstays untransmitted for the rest of that walk, and one RECONF chunk\ncarrying [Incoming SSN Reset Request, Outgoing SSN Reset Request,\nResponse] -- or two RECONF chunks in one packet -- reaches the same\ndereference.\n\n  KASAN: null-ptr-deref in range [0x00000000000001e8-0x00000000000001ef]\n  RIP: 0010:timer_delete+0x67/0x110\n  Call Trace:\n   \u003cIRQ\u003e\n   sctp_process_strreset_addstrm_out (net/sctp/stream.c:832)\n   sctp_sf_do_reconf (net/sctp/sm_statefuns.c:4212)\n   sctp_do_sm (net/sctp/sm_sideeffect.c:1172)\n   sctp_assoc_bh_rcv (net/sctp/associola.c:1044)\n   sctp_rcv (net/sctp/input.c:243)\n   ip_local_deliver (net/ipv4/ip_input.c:262)\n   process_backlog (net/core/dev.c:6680)\n   \u003c/IRQ\u003e\n\nA response can only acknowledge a request that was actually sent, so do\nnot match asoc-\u003estrreset_chunk while chunk-\u003etransport is NULL. Guarding\nthe lookup covers all three completion sites."
        }
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            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
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              "lang": "en",
              "value": "AV:N - A remote SCTP peer reaches the bug via sctp_rcv() -\u003e sctp_assoc_bh_rcv() -\u003e sctp_sf_do_reconf() on an established association; one RECONF carrying Incoming/Outgoing SSN Reset plus Response, or two bundled RECONF chunks, completes an untransmitted strreset_chunk. This is internet-facing SCTP (telecom/Diameter), not a local-only syscall.\nAC:L - The attacker fully controls the packet: sctp_cmd_interpreter() keeps the outqueue corked until the whole packet is processed, so the generated RECONF reply stays untransmitted and the follow-on parameter/chunk deterministically NULL-dereferences. request_seq is the peer\u0027s initial TSN from INIT/INIT-ACK; no race or uninfluenceable memory layout is required.\nPR:N - Triggering requires only a network-reachable established SCTP association; the attacker needs no local account, capabilities, or namespaces on the victim. RECONF is processed in ESTABLISHED without SCTP-AUTH by default (empty auth chunk list), so no extra credentials beyond being the SCTP peer.\nUI:N - Exploitation is driven entirely by inbound SCTP packets processed automatically in softirq on a listening or already-associated endpoint; no victim user action such as opening a file or mounting a filesystem is required.\nS:U - Impact is a kernel NULL dereference and oops in the host SCTP stack, remaining in the same kernel security authority; it is not a VM/guest-to-host escape, IOMMU bypass, or other cross-boundary breakout.\nC:N - The defect is a pure NULL pointer dereference of strreset_chunk-\u003etransport in timer_delete() (KASAN range around offset 0x1e8). No out-of-bounds read, UAF object reuse, or other disclosure primitive is involved.\nI:N - Only a NULL transport pointer is loaded and passed to timer_delete(); there is no write, type confusion, or memory corruption that could hijack control flow or modify kernel state beyond the crash.\nA:H - timer_delete() on the NULL transport oopses/panics the kernel from SCTP receive softirq (documented KASAN null-ptr-deref in sctp_process_strreset_*), which is a full availability loss and can be repeated at will by the peer."
            }
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        "dateUpdated": "2026-09-14T12:00:13.880Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/79ff751311e80fa0370007e46a79a6d601685e75"
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          "url": "https://git.kernel.org/stable/c/53141db979687eae7dc6d29414cefc77034f967e"
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          "url": "https://git.kernel.org/stable/c/68891125af5a5dfbca728809a16637a869bbe0df"
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        },
        {
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        }
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      "title": "sctp: fix NULL deref on untransmitted RECONF completion",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89477",
    "datePublished": "2026-09-11T19:43:33.851Z",
    "dateReserved": "2026-09-11T19:38:34.711Z",
    "dateUpdated": "2026-09-14T12:00:13.880Z",
    "state": "PUBLISHED"
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  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-89477",
      "date": "2026-09-16",
      "epss": "0.00508",
      "percentile": "0.42108"
    },
    "microsoft_vex": {
      "current_release_date": "2026-09-14T14:56:44.000Z",
      "cve": "CVE-2026-89477",
      "id": "msrc_CVE-2026-89477",
      "initial_release_date": "2026-09-13T01:09:44.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "sctp: fix NULL deref on untransmitted RECONF completion",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-89477.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-89477\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-11T20:19:29.063\",\"lastModified\":\"2026-09-14T13:19:04.127\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsctp: fix NULL deref on untransmitted RECONF completion\\n\\nsctp_process_strreset_outreq(), sctp_process_strreset_addstrm_out() and\\nsctp_process_strreset_resp() complete a pending stream reconfiguration\\nrequest by stopping the reconf timer on the transport it was sent on:\\n\\n\\tt = asoc-\u003estrreset_chunk-\u003etransport;\\n\\tif (timer_delete(\u0026t-\u003ereconf_timer))\\n\\t\\tsctp_transport_put(t);\\n\\nchunk-\u003etransport is assigned by __sctp_packet_append_chunk() when the\\nchunk is appended to an outbound packet, and sctp_outq_flush_ctrl() arms\\nthe reconf timer at that same point. A request already published in\\nasoc-\u003estrreset_chunk but not yet transmitted has neither, so completing\\nit dereferences NULL.\\n\\nTwo ways to get there. sctp_send_asconf_del_ip() sets\\nasoc-\u003esrc_out_of_asoc_ok without sending anything when the address being\\nremoved is the association\u0027s last one, and sctp_outq_flush_ctrl() then\\nleaves every non-ASCONF control chunk queued; as only\\nsctp_process_asconf_ack() clears that flag, it persists. An unprivileged\\nprocess that removes such an address and then asks for a stream reset\\npanics the kernel from softirq. A peer needs neither ASCONF nor local\\nhelp: sctp_cmd_interpreter() uncorks the outqueue only once the whole\\npacket has been processed, so a reply built while walking a RECONF chunk\\nstays untransmitted for the rest of that walk, and one RECONF chunk\\ncarrying [Incoming SSN Reset Request, Outgoing SSN Reset Request,\\nResponse] -- or two RECONF chunks in one packet -- reaches the same\\ndereference.\\n\\n  KASAN: null-ptr-deref in range [0x00000000000001e8-0x00000000000001ef]\\n  RIP: 0010:timer_delete+0x67/0x110\\n  Call Trace:\\n   \u003cIRQ\u003e\\n   sctp_process_strreset_addstrm_out (net/sctp/stream.c:832)\\n   sctp_sf_do_reconf (net/sctp/sm_statefuns.c:4212)\\n   sctp_do_sm (net/sctp/sm_sideeffect.c:1172)\\n   sctp_assoc_bh_rcv (net/sctp/associola.c:1044)\\n   sctp_rcv (net/sctp/input.c:243)\\n   ip_local_deliver (net/ipv4/ip_input.c:262)\\n   process_backlog (net/core/dev.c:6680)\\n   \u003c/IRQ\u003e\\n\\nA response can only acknowledge a request that was actually sent, so do\\nnot match asoc-\u003estrreset_chunk while chunk-\u003etransport is NULL. Guarding\\nthe lookup covers all three completion sites.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/sctp/stream.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"81054476453640159149cb6704e834893e16736b\",\"lessThan\":\"79ff751311e80fa0370007e46a79a6d601685e75\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"81054476453640159149cb6704e834893e16736b\",\"lessThan\":\"53141db979687eae7dc6d29414cefc77034f967e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"81054476453640159149cb6704e834893e16736b\",\"lessThan\":\"68891125af5a5dfbca728809a16637a869bbe0df\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"81054476453640159149cb6704e834893e16736b\",\"lessThan\":\"b2d6d873b4dfb5b84194061c4b40a1cd85b92ca4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"81054476453640159149cb6704e834893e16736b\",\"lessThan\":\"77ea60f2d24002c308f224db44a4542c466489af\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"81054476453640159149cb6704e834893e16736b\",\"lessThan\":\"25419f516ea84b1e7d3d55aae5215ac86ece0c66\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"81054476453640159149cb6704e834893e16736b\",\"lessThan\":\"0ee697defc0594f1da810ed75d9d643fb46f5318\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"81054476453640159149cb6704e834893e16736b\",\"lessThan\":\"2db9bfa3e27bdea15e05ea70b56bad3d21e570ec\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/sctp/stream.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.11\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.11\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.270\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.221\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.188\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.157\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.109\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.50\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.4\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"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:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0ee697defc0594f1da810ed75d9d643fb46f5318\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/25419f516ea84b1e7d3d55aae5215ac86ece0c66\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2db9bfa3e27bdea15e05ea70b56bad3d21e570ec\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/53141db979687eae7dc6d29414cefc77034f967e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/68891125af5a5dfbca728809a16637a869bbe0df\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/77ea60f2d24002c308f224db44a4542c466489af\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/79ff751311e80fa0370007e46a79a6d601685e75\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b2d6d873b4dfb5b84194061c4b40a1cd85b92ca4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-09-13T06:49:16+00:00",
      "cve": "CVE-2026-89477",
      "id": "CVE-2026-89477",
      "initial_release_date": "2026-09-11T19:43:33.851000+00:00",
      "product_status:known_affected": "2",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: SCTP null pointer dereference leads to denial of service",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89477.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T00:58:57Z",
      "cve": "CVE-2026-89477",
      "id": "CVE-2026-89477",
      "initial_release_date": "2026-09-15T00:58:57Z",
      "product_status:known_affected": "347",
      "product_status:known_not_affected": "6",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89477",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-89477.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.

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.