{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-05-04T06:14:00.385","vulnerabilities":[{"cve":{"id":"CVE-2026-23125","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","published":"2026-02-14T15:16:07.740","lastModified":"2026-03-18T14:50:20.100","vulnStatus":"Analyzed","cveTags":[],"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 después de SCTP_CMD_PEER_INIT\n\nSe informó de una desreferencia de puntero nulo (null-ptr-deref) en la ruta de transmisión SCTP cuando falla la inicialización 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 interpretación de comandos se detiene en caso de fallo, no debería haberse enviado ningún COOKIE_ECHO a través 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) más 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 después de sctp_process_init(), este parche mueve el SCTP_CMD_ASSOC_SHKEY inmediatamente después de SCTP_CMD_PEER_INIT, antes de detener T1_INIT e iniciar T1_COOKIE. Esto asegura que si la generación de clave compartida falla, los datos autenticados (authenticated DATA) no puedan ser enviados. También permite que el temporizador T1_INIT retransmita INIT, dando al cliente otra oportunidad de procesar INIT_ACK y reintentar la configuración de la clave."}],"metrics":{"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":5.5,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":3.6}]},"weaknesses":[{"source":"nvd@nist.gov","type":"Primary","description":[{"lang":"en","value":"CWE-476"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"5.10.249","matchCriteriaId":"AE477F32-00B6-4DD0-AF74-26E02721FC3B"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.15.199","matchCriteriaId":"A247FBA6-BEB9-484F-B892-DD5517949CCD"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.1.162","matchCriteriaId":"6579E0D4-0641-479D-A4C3-0EF618798C55"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.6.122","matchCriteriaId":"8EAAE395-0162-4BAF-9AD5-E9AF3C869C4F"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7","versionEndExcluding":"6.12.68","matchCriteriaId":"52F38E19-0FDD-4992-9D6D-D4169D689598"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"6.18.8","matchCriteriaId":"E65C6E79-7EBE-4C77-93F0-818CF5B38F4E"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*","matchCriteriaId":"17B67AA7-40D6-4AFA-8459-F200F3D7CFD1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*","matchCriteriaId":"C47E4CC9-C826-4FA9-B014-7FE3D9B318B2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*","matchCriteriaId":"F71D92C0-C023-48BD-B3B6-70B638EEE298"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*","matchCriteriaId":"13580667-0A98-40CC-B29F-D12790B91BDB"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:*","matchCriteriaId":"CAD1FED7-CF48-47BF-AC7D-7B6FA3C065FC"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:*","matchCriteriaId":"3EF854A1-ABB1-4E93-BE9A-44569EC76C0D"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/0c4adb1f391a7b92a0405e9d7c05624c0d9f8a65","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/5a309bedf02ee08b0653215f06c94d61ec7a214a","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/784428ab1889eb185a1459e9d6bc52df33d572ef","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/a80c9d945aef55b23b54838334345f20251dad83","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/bf2b543b3cc4ebb4ab5bca4f8dfa5612035d45b8","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/e7e81abbcc5620c9532080538f9709a6ea382855","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/e94294798548e8cfbd80869e1d2f97efce92582c","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]}]}}]}