CVE-2026-89477 (GCVE-0-2026-89477)
Vulnerability from cvelistv5
Published
2026-09-11 19:43
Modified
2026-10-19 08:47
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: 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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 81054476453640159149cb6704e834893e16736b
Version: 81054476453640159149cb6704e834893e16736b
Version: 81054476453640159149cb6704e834893e16736b
Version: 81054476453640159149cb6704e834893e16736b
Version: 81054476453640159149cb6704e834893e16736b
Version: 81054476453640159149cb6704e834893e16736b
Version: 81054476453640159149cb6704e834893e16736b
Version: 81054476453640159149cb6704e834893e16736b
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          "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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            "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 - 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": "2026-10-19T08:47:26.175Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
        {
          "url": "https://git.kernel.org/stable/c/79ff751311e80fa0370007e46a79a6d601685e75"
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        {
          "url": "https://git.kernel.org/stable/c/53141db979687eae7dc6d29414cefc77034f967e"
        },
        {
          "url": "https://git.kernel.org/stable/c/68891125af5a5dfbca728809a16637a869bbe0df"
        },
        {
          "url": "https://git.kernel.org/stable/c/b2d6d873b4dfb5b84194061c4b40a1cd85b92ca4"
        },
        {
          "url": "https://git.kernel.org/stable/c/77ea60f2d24002c308f224db44a4542c466489af"
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          "url": "https://git.kernel.org/stable/c/25419f516ea84b1e7d3d55aae5215ac86ece0c66"
        },
        {
          "url": "https://git.kernel.org/stable/c/0ee697defc0594f1da810ed75d9d643fb46f5318"
        },
        {
          "url": "https://git.kernel.org/stable/c/2db9bfa3e27bdea15e05ea70b56bad3d21e570ec"
        }
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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": "2026-10-19T08:47:26.175Z",
    "state": "PUBLISHED"
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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.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"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\"}], \"programFiles\": [\"net/sctp/stream.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.11\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.11\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.270\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.221\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.188\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.157\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.109\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.50\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.2.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.2.*\"}, {\"status\": \"unaffected\", \"version\": \"7.3\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/sctp/stream.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/79ff751311e80fa0370007e46a79a6d601685e75\"}, {\"url\": \"https://git.kernel.org/stable/c/53141db979687eae7dc6d29414cefc77034f967e\"}, {\"url\": \"https://git.kernel.org/stable/c/68891125af5a5dfbca728809a16637a869bbe0df\"}, {\"url\": \"https://git.kernel.org/stable/c/b2d6d873b4dfb5b84194061c4b40a1cd85b92ca4\"}, {\"url\": \"https://git.kernel.org/stable/c/77ea60f2d24002c308f224db44a4542c466489af\"}, {\"url\": \"https://git.kernel.org/stable/c/25419f516ea84b1e7d3d55aae5215ac86ece0c66\"}, {\"url\": \"https://git.kernel.org/stable/c/0ee697defc0594f1da810ed75d9d643fb46f5318\"}, {\"url\": \"https://git.kernel.org/stable/c/2db9bfa3e27bdea15e05ea70b56bad3d21e570ec\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.270\", \"versionStartIncluding\": \"4.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.221\", \"versionStartIncluding\": \"4.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.188\", \"versionStartIncluding\": \"4.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.157\", \"versionStartIncluding\": \"4.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.109\", \"versionStartIncluding\": \"4.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.50\", \"versionStartIncluding\": \"4.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2.4\", \"versionStartIncluding\": \"4.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.3\", \"versionStartIncluding\": \"4.11\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-10-19T08:47:26.175Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-89477\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T08:47:26.175Z\", \"dateReserved\": \"2026-09-11T19:38:34.711Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-09-11T19:43:33.851Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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