CVE-2026-74629

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(UAF)\n\nIn case of a failure in dibs_dev_add() being called by dibs_lo_dev_probe()\ndmb_clientid_arr is freed twice (double free).\n\nFree dmb_clientid_arr in dibs_dev_release() after last reference is gone.\nNote that allocating in dibs_dev_add() instead of dibs_dev_alloc() is ok\nfor now, because no dmbs can be registered before dibs_dev_add()."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:A - The UAF is hit when an ISM interrupt handler reads dmb_clientid_arr during SMC-D data transfer from a co-located peer on the same IBM Z CPC/HiperSockets domain; this is an adjacent-network attack surface, not arbitrary Internet reachability.\nAC:L - An attacker controls the IRQ side by sustaining SMC-D transfers that keep firing ism_handle_irq while device teardown runs; no rare memory layout or victim-specific state beyond concurrent traffic during hot-unplug/module removal is required.\nPR:N - Exploitation requires only an established SMC-D peer sending data to the victim; no Linux capabilities, root, or user-namespace privileges on the victim host are needed to drive the interrupt path that accesses the freed array.\nUI:N - No victim user action is required; the bug is triggered by remote SMC-D traffic coinciding with kernel driver teardown, not by opening files, mounting filesystems, or other interactive steps.\nS:U - Successful exploitation corrupts kernel heap memory and enables privilege escalation within the same kernel security domain; it does not by itself cross a VM/hypervisor or IOMMU boundary to another authority.\nC:H - The use-after-free of dmb_clientid_arr in ism_handle_irq permits out-of-bounds or attacker-influenced kernel heap reads that can disclose sensitive memory, including pointers usable in further exploitation.\nI:H - UAF on a heap-allocated client-ID lookup table in IRQ context can be turned into arbitrary kernel memory writes and control-flow hijacking via heap grooming and reuse of the freed allocation.\nA:H - Concurrent access to freed dmb_clientid_arr during interrupt handling can cause kernel oops/panic or wedged SMC-D processing, producing complete loss of availability on affected IBM Z systems."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/dibs/dibs_loopback.c", "drivers/dibs/dibs_main.c"], "versions": [{"version": "cc21191b584c6f7836b0f10774f8278b7cbfba10", "lessThan": "ece6426b61241e9bfb41aa131f235168f55229b1", "status": "affected", "versionType": "git"}, {"version": "cc21191b584c6f7836b0f10774f8278b7cbfba10", "lessThan": "7a1df20a8d2cc89e3a442b6e0b43b1cacde8d403", "status": "affected", "versionType": "git"}, {"version": "cc21191b584c6f7836b0f10774f8278b7cbfba10", "lessThan": "9e6869be49064915edb6c8776b27c376cfdb0df5", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/dibs/dibs_loopback.c", "drivers/dibs/dibs_main.c"], "versions": [{"version": "6.18", "status": "affected"}, {"version": "0", "lessThan": "6.18", "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": "6.18", "versionEndExcluding": "6.18.45"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18", "versionEndExcluding": "7.1.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/ece6426b61241e9bfb41aa131f235168f55229b1"}, {"url": "https://git.kernel.org/stable/c/7a1df20a8d2cc89e3a442b6e0b43b1cacde8d403"}, {"url": "https://git.kernel.org/stable/c/9e6869be49064915edb6c8776b27c376cfdb0df5"}], "title": "net/dibs: Correct freeing of dmb_clientid_arr", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-74629", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T19:02:53.858815Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:06:03.413Z"}}]}}

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(UAF)\n\nIn case of a failure in dibs_dev_add() being called by dibs_lo_dev_probe()\ndmb_clientid_arr is freed twice (double free).\n\nFree dmb_clientid_arr in dibs_dev_release() after last reference is gone.\nNote that allocating in dibs_dev_add() instead of dibs_dev_alloc() is ok\nfor now, because no dmbs can be registered before dibs_dev_add()."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.45", "versionStartIncluding": "6.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.9", "versionStartIncluding": "6.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "6.18"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-25T05:40:53.253Z"}}}, "cveMetadata": {"cveId": "CVE-2026-74629", "state": "PUBLISHED", "dateUpdated": "2026-10-16T19:06:03.413Z", "dateReserved": "2026-08-15T05:44:03.921Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-22T15:32:10.861Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/dibs/dibs_loopback.c", "drivers/dibs/dibs_main.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "ece6426b61241e9bfb41aa131f235168f55229b1", "status": "affected", "version": "cc21191b584c6f7836b0f10774f8278b7cbfba10", "versionType": "git"}, {"lessThan": "7a1df20a8d2cc89e3a442b6e0b43b1cacde8d403", "status": "affected", "version": "cc21191b584c6f7836b0f10774f8278b7cbfba10", "versionType": "git"}, {"lessThan": "9e6869be49064915edb6c8776b27c376cfdb0df5", "status": "affected", "version": "cc21191b584c6f7836b0f10774f8278b7cbfba10", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/dibs/dibs_loopback.c", "drivers/dibs/dibs_main.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.18"}, {"lessThan": "6.18", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.45", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.9", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/dibs: Correct freeing of dmb_clientid_arr\n\nA dibs device interrupt handler can be active after dibs_dev_del() and\nmay still access dmb_clientid_arr. (UAF)\n\nIn case of a failure in dibs_dev_add() being called by dibs_lo_dev_probe()\ndmb_clientid_arr is freed twice (double free).\n\nFree dmb_clientid_arr in dibs_dev_release() after last reference is gone.\nNote that allocating in dibs_dev_add() instead of dibs_dev_alloc() is ok\nfor now, because no dmbs can be registered before dibs_dev_add()."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet/dibs: Liberaci\u00f3n correcta de dmb_clientid_arr\n\nUn gestor de interrupciones de dispositivo dibs puede estar activo despu\u00e9s de dibs_dev_del() y a\u00fan puede acceder a dmb_clientid_arr. (UAF)\n\nEn caso de un fallo en dibs_dev_add() siendo llamada por dibs_lo_dev_probe(), dmb_clientid_arr se libera dos veces (doble liberaci\u00f3n).\n\nLiberar dmb_clientid_arr en dibs_dev_release() despu\u00e9s de que la \u00faltima referencia haya desaparecido. Tenga en cuenta que asignar en dibs_dev_add() en lugar de dibs_dev_alloc() est\u00e1 bien por ahora, porque no se pueden registrar dmbs antes de dibs_dev_add()."}], "id": "CVE-2026-74629", "lastModified": "2026-10-16T20:17:47.947", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-74629", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T19:02:53.858815Z", "version": "2.0.3"}}]}, "published": "2026-08-22T16:16:35.840", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7a1df20a8d2cc89e3a442b6e0b43b1cacde8d403"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9e6869be49064915edb6c8776b27c376cfdb0df5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ece6426b61241e9bfb41aa131f235168f55229b1"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: net/dibs: Correct freeing of dmb_clientid_arr", "id": "2521411", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2521411"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet/dibs: Correct freeing of dmb_clientid_arr\nA dibs device interrupt handler can be active after dibs_dev_del() and\nmay still access dmb_clientid_arr. (UAF)\nIn case of a failure in dibs_dev_add() being called by dibs_lo_dev_probe()\ndmb_clientid_arr is freed twice (double free).\nFree dmb_clientid_arr in dibs_dev_release() after last reference is gone.\nNote that allocating in dibs_dev_add() instead of dibs_dev_alloc() is ok\nfor now, because no dmbs can be registered before dibs_dev_add().", "A flaw was found in the Linux kernel's dibs device handling. A use-after-free (UAF) vulnerability exists where a dibs device interrupt handler can access dmb_clientid_arr after it has been freed. Additionally, a double-free vulnerability can occur if dibs_dev_add() fails during dibs_lo_dev_probe(), leading to dmb_clientid_arr being freed twice. These issues could potentially lead to system instability or denial of service."], "name": "CVE-2026-74629", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74629\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74629\nhttps://lore.kernel.org/linux-cve-announce/2026082221-CVE-2026-74629-6db1@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[cc21191b584c6f7836b0f10774f8278b7cbfba10,ece6426b61241e9bfb41aa131f235168f55229b1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[cc21191b584c6f7836b0f10774f8278b7cbfba10,7a1df20a8d2cc89e3a442b6e0b43b1cacde8d403)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[cc21191b584c6f7836b0f10774f8278b7cbfba10,9e6869be49064915edb6c8776b27c376cfdb0df5)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.18"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.18)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.45,6.19.0]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.9,7.2.0]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-22T18:30:16.727344+00:00", "updated": "2026-08-25T13:45:04.367887+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-416", "CWE-825"]}