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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": "2026-09-15",
      "epss": "0.00508",
      "percentile": "0.41912"
    },
    "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.