{"id":"CVE-2026-74586","revision":null,"records":[{"revision":"157d8cfea30647f8bd135d50b515f390","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-74586","aliases":[],"title":"sctp: clear new_transport when removing a peer","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: clear new_transport when removing a peer\n\nsctp_process_asconf_param() stores a newly added peer transport in\nasoc->new_transport. After all parameters in the ASCONF chunk have been\nprocessed, sctp_sf_do_asconf() uses this pointer to send a HEARTBEAT to the\nnew transport.\n\nAn authenticated ASCONF from a remote SCTP peer can add a transport and\nremove it again with a wildcard DEL-IP parameter in the same chunk. The\nwildcard deletion preserves the transport on which the ASCONF arrived, but\nremoves the newly added transport through\nsctp_assoc_del_nonprimary_peers(). The removal does not clear\nasoc->new_transport, leaving it pointing to the removed transport.\n\nsctp_sf_do_asconf() then creates a HEARTBEAT whose chunk->transport points\nto the removed transport without holding a transport reference. During\nlocal address replacement, src_out_of_asoc_ok keeps this HEARTBEAT on\ncontrol_chunk_list. After the transport is freed by RCU, a successful\nASCONF_ACK for the replacement address releases the queued HEARTBEAT and\nsctp_outq_select_transport() reads the freed transport's state.\n\nThe issue was found during a static audit of SCTP objects. With an\nauthenticated peer, the reproducer triggered the same KASAN report in 2\nof 2 unpatched runs on a KASAN-enabled netdev/main kernel:\n\n BUG: KASAN: slab-use-after-free in sctp_outq_select_transport\n Read of size 4 at addr ffff88800b9bd95c by task python3/197\n\n Call Trace:\n sctp_outq_select_transport+0x549/0x8b0 [sctp]\n sctp_outq_flush+0x306/0x2c60 [sctp]\n sctp_transport_immediate_rtx+0xaf/0x260 [sctp]\n sctp_process_asconf_ack+0xa48/0xf70 [sctp]\n\n Allocated by task 197:\n sctp_transport_new+0x68/0x650 [sctp]\n sctp_assoc_add_peer+0x258/0x12a0 [sctp]\n sctp_process_asconf+0x5e9/0x1090 [sctp]\n\n Last potentially related work creation:\n __call_rcu_common.constprop.0+0x77/0xb70\n sctp_assoc_del_nonprimary_peers+0x7c/0xd0 [sctp]\n sctp_process_asconf+0xd9c/0x1090 [sctp]\n\nThe first invalid access was a four-byte read of transport->state at\nnet/sctp/outqueue.c:833. The same reproducer completed the full\nauthenticated ASCONF and local-address replacement sequence with this\nchange without a KASAN report or oops.\n\nClear new_transport when its peer is removed, before it can be used to\ncreate the HEARTBEAT.","state":0,"publishedAt":"2026-08-22T15:31:39.094+00:00","modifiedAt":"2026-10-16T19:05:58.687+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/sctp/associola.c\"\n ],\n \"versions\": [\n {\n \"version\": \"6af29ccc223b0feb6fc6112281c3fa3cdb1afddf\",\n \"lessThan\": \"c0f973bb5118dd1b146cda3fcc8af6f6057befec\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"6af29ccc223b0feb6fc6112281c3fa3cdb1afddf\",\n \"lessThan\": \"3b539b317cd052236fed0350364ff1268996ba46\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"6af29ccc223b0feb6fc6112281c3fa3cdb1afddf\",\n \"lessThan\": \"db9d8e3b670f841755bc2018f178472dc6064d27\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"6af29ccc223b0feb6fc6112281c3fa3cdb1afddf\",\n \"lessThan\": \"31efa656cf6aface26e88f038c14f22ee6ca1500\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"6af29ccc223b0feb6fc6112281c3fa3cdb1afddf\",\n \"lessThan\": \"291accf36febce751021888de5f15090f4875b56\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"6af29ccc223b0feb6fc6112281c3fa3cdb1afddf\",\n \"lessThan\": \"ca33df36aa0143a1d04f57d2086020c12e7eddb7\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"6af29ccc223b0feb6fc6112281c3fa3cdb1afddf\",\n \"lessThan\": \"163847552a571bd55094291f4ffcdc1de0f14a7b\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"6af29ccc223b0feb6fc6112281c3fa3cdb1afddf\",\n \"lessThan\": \"beb33f8ee1ca83acddb2a5ae80f3d22ec550b4c3\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/sctp/associola.c\"\n ],\n \"versions\": [\n {\n \"version\": \"3.2\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"3.2\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.265\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.216\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.183\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.152\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.104\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.45\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1.9\",\n \"lessThanOrEqual\": \"7.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/c0f973bb5118dd1b146cda3fcc8af6f6057befec","https://git.kernel.org/stable/c/3b539b317cd052236fed0350364ff1268996ba46","https://git.kernel.org/stable/c/db9d8e3b670f841755bc2018f178472dc6064d27","https://git.kernel.org/stable/c/31efa656cf6aface26e88f038c14f22ee6ca1500","https://git.kernel.org/stable/c/291accf36febce751021888de5f15090f4875b56","https://git.kernel.org/stable/c/ca33df36aa0143a1d04f57d2086020c12e7eddb7","https://git.kernel.org/stable/c/163847552a571bd55094291f4ffcdc1de0f14a7b","https://git.kernel.org/stable/c/beb33f8ee1ca83acddb2a5ae80f3d22ec550b4c3"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74586","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-74586","identifiers":["CVE-2026-74586"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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