{"api_version":"1","generated_at":"2026-10-27T09:43:09+00:00","cve":"CVE-2026-74629","urls":{"html":"https://cve.report/CVE-2026-74629","api":"https://cve.report/api/cve/CVE-2026-74629.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74629","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74629"},"summary":{"title":"net/dibs: Correct freeing of dmb_clientid_arr","description":"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().","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-22 16:16:35","updated_at":"2026-10-16 20:17:47"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"8.8","severity":"HIGH","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"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","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"8.8","severity":"HIGH","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/9e6869be49064915edb6c8776b27c376cfdb0df5","name":"https://git.kernel.org/stable/c/9e6869be49064915edb6c8776b27c376cfdb0df5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7a1df20a8d2cc89e3a442b6e0b43b1cacde8d403","name":"https://git.kernel.org/stable/c/7a1df20a8d2cc89e3a442b6e0b43b1cacde8d403","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ece6426b61241e9bfb41aa131f235168f55229b1","name":"https://git.kernel.org/stable/c/ece6426b61241e9bfb41aa131f235168f55229b1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74629","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74629","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected cc21191b584c6f7836b0f10774f8278b7cbfba10 ece6426b61241e9bfb41aa131f235168f55229b1 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected cc21191b584c6f7836b0f10774f8278b7cbfba10 7a1df20a8d2cc89e3a442b6e0b43b1cacde8d403 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected cc21191b584c6f7836b0f10774f8278b7cbfba10 9e6869be49064915edb6c8776b27c376cfdb0df5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.18","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.45 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.9 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"74629","cve":"CVE-2026-74629","epss":"0.003750000","percentile":"0.298930000","score_date":"2026-10-16","updated_at":"2026-10-17 00:14:15"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"metrics":[{"other":{"content":{"id":"CVE-2026-74629","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","timestamp":"2026-10-16T19:02:53.858815Z","version":"2.0.3"},"type":"ssvc"}}],"providerMetadata":{"dateUpdated":"2026-10-16T19:06:03.413Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"title":"CISA ADP Vulnrichment"}],"cna":{"affected":[{"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"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.45","versionStartIncluding":"6.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.9","versionStartIncluding":"6.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"6.18","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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()."}],"metrics":[{"cvssV3_1":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"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."}]}],"providerMetadata":{"dateUpdated":"2026-08-25T05:40:53.253Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-74629","datePublished":"2026-08-22T15:32:10.861Z","dateReserved":"2026-08-15T05:44:03.921Z","dateUpdated":"2026-10-16T19:06:03.413Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-22 16:16:35","lastModifiedDate":"2026-10-16 20:17:47","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"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","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":5.9}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-10-16T19:02:53.858815Z","id":"CVE-2026-74629","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"74629","Ordinal":"1","Title":"net/dibs: Correct freeing of dmb_clientid_arr","CVE":"CVE-2026-74629","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"74629","Ordinal":"1","NoteData":"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().","Type":"Description","Title":"net/dibs: Correct freeing of dmb_clientid_arr"}]}}}