{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-74586", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.918Z", "datePublished": "2026-08-22T15:31:39.094Z", "dateUpdated": "2026-08-22T15:31:39.094Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-22T15:31:39.094Z" }, "descriptions": [ { "lang": "en", "value": "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." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/sctp/associola.c" ], "versions": [ { "version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf", "lessThan": "c0f973bb5118dd1b146cda3fcc8af6f6057befec", "status": "affected", "versionType": "git" }, { "version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf", "lessThan": "3b539b317cd052236fed0350364ff1268996ba46", "status": "affected", "versionType": "git" }, { "version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf", "lessThan": "db9d8e3b670f841755bc2018f178472dc6064d27", "status": "affected", "versionType": "git" }, { "version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf", "lessThan": "31efa656cf6aface26e88f038c14f22ee6ca1500", "status": "affected", "versionType": "git" }, { "version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf", "lessThan": "291accf36febce751021888de5f15090f4875b56", "status": "affected", "versionType": "git" }, { "version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf", "lessThan": "ca33df36aa0143a1d04f57d2086020c12e7eddb7", "status": "affected", "versionType": "git" }, { "version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf", "lessThan": "163847552a571bd55094291f4ffcdc1de0f14a7b", "status": "affected", "versionType": "git" }, { "version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf", "lessThan": "beb33f8ee1ca83acddb2a5ae80f3d22ec550b4c3", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/sctp/associola.c" ], "versions": [ { "version": "3.2", "status": "affected" }, { "version": "0", "lessThan": "3.2", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.152", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.104", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.45", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.9", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "5.10.265" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "5.15.216" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.1.183" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.6.152" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.12.104" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.18.45" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "7.1.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/c0f973bb5118dd1b146cda3fcc8af6f6057befec" }, { "url": "https://git.kernel.org/stable/c/3b539b317cd052236fed0350364ff1268996ba46" }, { "url": "https://git.kernel.org/stable/c/db9d8e3b670f841755bc2018f178472dc6064d27" }, { "url": "https://git.kernel.org/stable/c/31efa656cf6aface26e88f038c14f22ee6ca1500" }, { "url": "https://git.kernel.org/stable/c/291accf36febce751021888de5f15090f4875b56" }, { "url": "https://git.kernel.org/stable/c/ca33df36aa0143a1d04f57d2086020c12e7eddb7" }, { "url": "https://git.kernel.org/stable/c/163847552a571bd55094291f4ffcdc1de0f14a7b" }, { "url": "https://git.kernel.org/stable/c/beb33f8ee1ca83acddb2a5ae80f3d22ec550b4c3" } ], "title": "sctp: clear new_transport when removing a peer", "x_generator": { "engine": "bippy-1.2.0" } } } }