CVE-2026-23125

{"id": "CVE-2026-23125", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "published": "2026-02-14T15:16:07.740", "references": [{"url": "https://git.kernel.org/stable/c/0c4adb1f391a7b92a0405e9d7c05624c0d9f8a65", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/5a309bedf02ee08b0653215f06c94d61ec7a214a", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/784428ab1889eb185a1459e9d6bc52df33d572ef", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/a80c9d945aef55b23b54838334345f20251dad83", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/bf2b543b3cc4ebb4ab5bca4f8dfa5612035d45b8", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/e7e81abbcc5620c9532080538f9709a6ea382855", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/e94294798548e8cfbd80869e1d2f97efce92582c", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-476"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: move SCTP_CMD_ASSOC_SHKEY right after SCTP_CMD_PEER_INIT\n\nA null-ptr-deref was reported in the SCTP transmit path when SCTP-AUTH key\ninitialization fails:\n\n ==================================================================\n KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]\n CPU: 0 PID: 16 Comm: ksoftirqd/0 Tainted: G W 6.6.0 #2\n RIP: 0010:sctp_packet_bundle_auth net/sctp/output.c:264 [inline]\n RIP: 0010:sctp_packet_append_chunk+0xb36/0x1260 net/sctp/output.c:401\n Call Trace:\n\n sctp_packet_transmit_chunk+0x31/0x250 net/sctp/output.c:189\n sctp_outq_flush_data+0xa29/0x26d0 net/sctp/outqueue.c:1111\n sctp_outq_flush+0xc80/0x1240 net/sctp/outqueue.c:1217\n sctp_cmd_interpreter.isra.0+0x19a5/0x62c0 net/sctp/sm_sideeffect.c:1787\n sctp_side_effects net/sctp/sm_sideeffect.c:1198 [inline]\n sctp_do_sm+0x1a3/0x670 net/sctp/sm_sideeffect.c:1169\n sctp_assoc_bh_rcv+0x33e/0x640 net/sctp/associola.c:1052\n sctp_inq_push+0x1dd/0x280 net/sctp/inqueue.c:88\n sctp_rcv+0x11ae/0x3100 net/sctp/input.c:243\n sctp6_rcv+0x3d/0x60 net/sctp/ipv6.c:1127\n\nThe issue is triggered when sctp_auth_asoc_init_active_key() fails in\nsctp_sf_do_5_1C_ack() while processing an INIT_ACK. In this case, the\ncommand sequence is currently:\n\n- SCTP_CMD_PEER_INIT\n- SCTP_CMD_TIMER_STOP (T1_INIT)\n- SCTP_CMD_TIMER_START (T1_COOKIE)\n- SCTP_CMD_NEW_STATE (COOKIE_ECHOED)\n- SCTP_CMD_ASSOC_SHKEY\n- SCTP_CMD_GEN_COOKIE_ECHO\n\nIf SCTP_CMD_ASSOC_SHKEY fails, asoc->shkey remains NULL, while\nasoc->peer.auth_capable and asoc->peer.peer_chunks have already been set by\nSCTP_CMD_PEER_INIT. This allows a DATA chunk with auth = 1 and shkey = NULL\nto be queued by sctp_datamsg_from_user().\n\nSince command interpretation stops on failure, no COOKIE_ECHO should been\nsent via SCTP_CMD_GEN_COOKIE_ECHO. However, the T1_COOKIE timer has already\nbeen started, and it may enqueue a COOKIE_ECHO into the outqueue later. As\na result, the DATA chunk can be transmitted together with the COOKIE_ECHO\nin sctp_outq_flush_data(), leading to the observed issue.\n\nSimilar to the other places where it calls sctp_auth_asoc_init_active_key()\nright after sctp_process_init(), this patch moves the SCTP_CMD_ASSOC_SHKEY\nimmediately after SCTP_CMD_PEER_INIT, before stopping T1_INIT and starting\nT1_COOKIE. This ensures that if shared key generation fails, authenticated\nDATA cannot be sent. It also allows the T1_INIT timer to retransmit INIT,\ngiving the client another chance to process INIT_ACK and retry key setup."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nsctp: mover SCTP_CMD_ASSOC_SHKEY justo despu\u00e9s de SCTP_CMD_PEER_INIT\n\nSe inform\u00f3 de una desreferencia de puntero nulo (null-ptr-deref) en la ruta de transmisi\u00f3n SCTP cuando falla la inicializaci\u00f3n de la clave SCTP-AUTH:\n\n ==================================================================\n KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]\n CPU: 0 PID: 16 Comm: ksoftirqd/0 Tainted: G W 6.6.0 #2\n RIP: 0010:sctp_packet_bundle_auth net/sctp/output.c:264 [inline]\n RIP: 0010:sctp_packet_append_chunk+0xb36/0x1260 net/sctp/output.c:401\n Call Trace:\n\n sctp_packet_transmit_chunk+0x31/0x250 net/sctp/output.c:189\n sctp_outq_flush_data+0xa29/0x26d0 net/sctp/outqueue.c:1111\n sctp_outq_flush+0xc80/0x1240 net/sctp/outqueue.c:1217\n sctp_cmd_interpreter.isra.0+0x19a5/0x62c0 net/sctp/sm_sideeffect.c:1787\n sctp_side_effects net/sctp/sm_sideeffect.c:1198 [inline]\n sctp_do_sm+0x1a3/0x670 net/sctp/sm_sideeffect.c:1169\n sctp_assoc_bh_rcv+0x33e/0x640 net/sctp/associola.c:1052\n sctp_inq_push+0x1dd/0x280 net/sctp/inqueue.c:88\n sctp_rcv+0x11ae/0x3100 net/sctp/input.c:243\n sctp6_rcv+0x3d/0x60 net/sctp/ipv6.c:1127\n\nEl problema se activa cuando sctp_auth_asoc_init_active_key() falla en sctp_sf_do_5_1C_ack() mientras se procesa un INIT_ACK. En este caso, la secuencia de comandos es actualmente:\n\n- SCTP_CMD_PEER_INIT\n- SCTP_CMD_TIMER_STOP (T1_INIT)\n- SCTP_CMD_TIMER_START (T1_COOKIE)\n- SCTP_CMD_NEW_STATE (COOKIE_ECHOED)\n- SCTP_CMD_ASSOC_SHKEY\n- SCTP_CMD_GEN_COOKIE_ECHO\n\nSi SCTP_CMD_ASSOC_SHKEY falla, asoc->shkey permanece NULL, mientras que asoc->peer.auth_capable y asoc->peer.peer_chunks ya han sido establecidos por SCTP_CMD_PEER_INIT. Esto permite que un fragmento DATA con auth = 1 y shkey = NULL sea encolado por sctp_datamsg_from_user().\n\nDado que la interpretaci\u00f3n de comandos se detiene en caso de fallo, no deber\u00eda haberse enviado ning\u00fan COOKIE_ECHO a trav\u00e9s de SCTP_CMD_GEN_COOKIE_ECHO. Sin embargo, el temporizador T1_COOKIE ya se ha iniciado, y puede encolar un COOKIE_ECHO en la cola de salida (outqueue) m\u00e1s tarde. Como resultado, el fragmento DATA puede transmitirse junto con el COOKIE_ECHO en sctp_outq_flush_data(), lo que lleva al problema observado.\n\nDe forma similar a otros lugares donde llama a sctp_auth_asoc_init_active_key() justo despu\u00e9s de sctp_process_init(), este parche mueve el SCTP_CMD_ASSOC_SHKEY inmediatamente despu\u00e9s de SCTP_CMD_PEER_INIT, antes de detener T1_INIT e iniciar T1_COOKIE. Esto asegura que si la generaci\u00f3n de clave compartida falla, los datos autenticados (authenticated DATA) no puedan ser enviados. Tambi\u00e9n permite que el temporizador T1_INIT retransmita INIT, dando al cliente otra oportunidad de procesar INIT_ACK y reintentar la configuraci\u00f3n de la clave."}], "lastModified": "2026-03-18T14:50:20.100", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "AE477F32-00B6-4DD0-AF74-26E02721FC3B", "versionEndExcluding": "5.10.249", "versionStartIncluding": "2.6.24"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A247FBA6-BEB9-484F-B892-DD5517949CCD", "versionEndExcluding": "5.15.199", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "6579E0D4-0641-479D-A4C3-0EF618798C55", "versionEndExcluding": "6.1.162", "versionStartIncluding": "5.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8EAAE395-0162-4BAF-9AD5-E9AF3C869C4F", "versionEndExcluding": "6.6.122", "versionStartIncluding": "6.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "52F38E19-0FDD-4992-9D6D-D4169D689598", "versionEndExcluding": "6.12.68", "versionStartIncluding": "6.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E65C6E79-7EBE-4C77-93F0-818CF5B38F4E", "versionEndExcluding": "6.18.8", "versionStartIncluding": "6.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "17B67AA7-40D6-4AFA-8459-F200F3D7CFD1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C47E4CC9-C826-4FA9-B014-7FE3D9B318B2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F71D92C0-C023-48BD-B3B6-70B638EEE298"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "13580667-0A98-40CC-B29F-D12790B91BDB"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "CAD1FED7-CF48-47BF-AC7D-7B6FA3C065FC"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "3EF854A1-ABB1-4E93-BE9A-44569EC76C0D"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}