{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-74587",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-08-15T05:44:03.918Z",
        "datePublished": "2026-08-22T15:31:39.810Z",
        "dateUpdated": "2026-08-22T15:31:39.810Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-22T15:31:39.810Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: fix use-after-free of cached ASCONF chunk\n\naddip_last_asconf caches the outstanding outbound ASCONF chunk. The normal\nASCONF-ACK completion path releases the chunk and clears the pointer.\n\nHowever, sctp_asconf_queue_teardown() releases the cached chunk without\nclearing addip_last_asconf. During peer restart handling,\nsctp_sf_do_dupcook_a() queues SCTP_CMD_PURGE_ASCONF_QUEUE, which invokes\nsctp_asconf_queue_teardown() while the association remains alive and leaves\nthe pointer dangling.\n\nA delayed authenticated ASCONF-ACK can then reach sctp_sf_do_asconf_ack(),\nwhich accesses the stale chunk and passes it to sctp_process_asconf_ack(),\ncausing a use-after-free and a second release.\n\nClearing the pointer exposes a race with T4 expiry. Peer restart handling\nqueues the timer stop before the purge, but SCTP_CMD_TIMER_STOP uses\ntimer_delete(), which does not wait for a callback already running on\nanother CPU. Such a callback can reach sctp_sf_t4_timer_expire() after\nthe purge and dereference NULL.\n\nClear addip_last_asconf after releasing the cached chunk, and make\nsctp_sf_t4_timer_expire() consume a stale T4 expiry if no outstanding\nASCONF remains."
                }
            ],
            "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",
                        "net/sctp/sm_statefuns.c"
                    ],
                    "versions": [
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                            "version": "a000c01e60e40e15304ffe48fff051d17a7bea91",
                            "lessThan": "10459b03e2d9ee12435e96f587de4d4cacdbf435",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "a000c01e60e40e15304ffe48fff051d17a7bea91",
                            "lessThan": "e1bb114e09372fd6e03387ced9ef566da336ed6c",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "a000c01e60e40e15304ffe48fff051d17a7bea91",
                            "lessThan": "179676f0166230c80053a392303485b37c93dd33",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "a000c01e60e40e15304ffe48fff051d17a7bea91",
                            "lessThan": "dc67d528c2fa939cec7fe3bf7f3089c8d281ca3d",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "a000c01e60e40e15304ffe48fff051d17a7bea91",
                            "lessThan": "618b5c6d049896fcfabb91afc072954c92cb2693",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "a000c01e60e40e15304ffe48fff051d17a7bea91",
                            "lessThan": "07daf4f9750104960a1d60831b2353c0d41f35fb",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "a000c01e60e40e15304ffe48fff051d17a7bea91",
                            "lessThan": "d949992bc3f00027a2c755e860a11950c75f6073",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "a000c01e60e40e15304ffe48fff051d17a7bea91",
                            "lessThan": "8c283e7b56adce00193837f3311b06662466fb21",
                            "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",
                        "net/sctp/sm_statefuns.c"
                    ],
                    "versions": [
                        {
                            "version": "3.0",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "3.0",
                            "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": [
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                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.0",
                                    "versionEndExcluding": "5.10.265"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/10459b03e2d9ee12435e96f587de4d4cacdbf435"
                },
                {
                    "url": "https://git.kernel.org/stable/c/e1bb114e09372fd6e03387ced9ef566da336ed6c"
                },
                {
                    "url": "https://git.kernel.org/stable/c/179676f0166230c80053a392303485b37c93dd33"
                },
                {
                    "url": "https://git.kernel.org/stable/c/dc67d528c2fa939cec7fe3bf7f3089c8d281ca3d"
                },
                {
                    "url": "https://git.kernel.org/stable/c/618b5c6d049896fcfabb91afc072954c92cb2693"
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                    "url": "https://git.kernel.org/stable/c/07daf4f9750104960a1d60831b2353c0d41f35fb"
                },
                {
                    "url": "https://git.kernel.org/stable/c/d949992bc3f00027a2c755e860a11950c75f6073"
                },
                {
                    "url": "https://git.kernel.org/stable/c/8c283e7b56adce00193837f3311b06662466fb21"
                }
            ],
            "title": "sctp: fix use-after-free of cached ASCONF chunk",
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}