{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2026-23125", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-23125", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-02-14T15:09:54.756Z", "updatedAt": "2026-10-19T18:25:32.393Z", "importedAt": "2026-10-24T01:58:02.025Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "sctp: move SCTP_CMD_ASSOC_SHKEY right after SCTP_CMD_PEER_INIT", "summary": "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.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "730fc3d05cd4ba4c9ce2de91f3d43349e95dbbf5", "status": "affected", "versionType": "git", "lessThan": "5a309bedf02ee08b0653215f06c94d61ec7a214a" }, { "version": "730fc3d05cd4ba4c9ce2de91f3d43349e95dbbf5", "status": "affected", "versionType": "git", "lessThan": "784428ab1889eb185a1459e9d6bc52df33d572ef" }, { "version": "730fc3d05cd4ba4c9ce2de91f3d43349e95dbbf5", "status": "affected", "versionType": "git", "lessThan": "e94294798548e8cfbd80869e1d2f97efce92582c" }, { "version": "730fc3d05cd4ba4c9ce2de91f3d43349e95dbbf5", "status": "affected", "versionType": "git", "lessThan": "e7e81abbcc5620c9532080538f9709a6ea382855" }, { "version": "730fc3d05cd4ba4c9ce2de91f3d43349e95dbbf5", "status": "affected", "versionType": "git", "lessThan": "bf2b543b3cc4ebb4ab5bca4f8dfa5612035d45b8" }, { "version": "730fc3d05cd4ba4c9ce2de91f3d43349e95dbbf5", "status": "affected", "versionType": "git", "lessThan": "0c4adb1f391a7b92a0405e9d7c05624c0d9f8a65" }, { "version": "730fc3d05cd4ba4c9ce2de91f3d43349e95dbbf5", "status": "affected", "versionType": "git", "lessThan": "a80c9d945aef55b23b54838334345f20251dad83" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "2.6.24", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "2.6.24" }, { "version": "5.10.249", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.199", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.162", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.122", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.68", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.8", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "6.19", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }