{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89742", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.761Z", "datePublished": "2026-09-11T19:46:48.522Z", "dateUpdated": "2026-09-11T19:46:48.522Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-11T19:46:48.522Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrapidio: mport_cdev: fix use-after-free in dma_req_free()\n\ndma_req_free() acquires buf_mutex through req->map, drops the mapping\nreference with kref_put(), and then dereferences req->map again to unlock\nthe mutex.\n\nIf kref_put() drops the last reference, mport_release_mapping() frees the\nmapping, and the subsequent mutex_unlock() dereferences a freed object. \nThis is a use-after-free.\n\nFix this by caching map and md before kref_put(), clearing req->map while\nholding buf_mutex, and using the cached md for mutex unlocking.\n\nThe bug is reachable from userspace via the RapidIO mport character device\ninterface."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/rapidio/devices/rio_mport_cdev.c"], "versions": [{"version": "e8de370188d098bb49483c287b44925957c3c9b6", "lessThan": "9a9929ec875ff20922c90c96fd544ae8a2a61a8d", "status": "affected", "versionType": "git"}, {"version": "e8de370188d098bb49483c287b44925957c3c9b6", "lessThan": "e6e925cc1f8067c65c7bec3da50a0ead3b3ef4e0", "status": "affected", "versionType": "git"}, {"version": "e8de370188d098bb49483c287b44925957c3c9b6", "lessThan": "211c68d817a3d9dc14c0026a59da7cac30f8147e", "status": "affected", "versionType": "git"}, {"version": "e8de370188d098bb49483c287b44925957c3c9b6", "lessThan": "5cbef379a94b161726c5f504598bf4791d45cedc", "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/rapidio/devices/rio_mport_cdev.c"], "versions": [{"version": "4.6", "status": "affected"}, {"version": "0", "lessThan": "4.6", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3-rc1", "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": "4.6", "versionEndExcluding": "6.12.109"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "7.3-rc1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/9a9929ec875ff20922c90c96fd544ae8a2a61a8d"}, {"url": "https://git.kernel.org/stable/c/e6e925cc1f8067c65c7bec3da50a0ead3b3ef4e0"}, {"url": "https://git.kernel.org/stable/c/211c68d817a3d9dc14c0026a59da7cac30f8147e"}, {"url": "https://git.kernel.org/stable/c/5cbef379a94b161726c5f504598bf4791d45cedc"}], "title": "rapidio: mport_cdev: fix use-after-free in dma_req_free()", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/rapidio/devices/rio_mport_cdev.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "9a9929ec875ff20922c90c96fd544ae8a2a61a8d", "status": "affected", "version": "e8de370188d098bb49483c287b44925957c3c9b6", "versionType": "git"}, {"lessThan": "e6e925cc1f8067c65c7bec3da50a0ead3b3ef4e0", "status": "affected", "version": "e8de370188d098bb49483c287b44925957c3c9b6", "versionType": "git"}, {"lessThan": "211c68d817a3d9dc14c0026a59da7cac30f8147e", "status": "affected", "version": "e8de370188d098bb49483c287b44925957c3c9b6", "versionType": "git"}, {"lessThan": "5cbef379a94b161726c5f504598bf4791d45cedc", "status": "affected", "version": "e8de370188d098bb49483c287b44925957c3c9b6", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/rapidio/devices/rio_mport_cdev.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.6"}, {"lessThan": "4.6", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.109", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.50", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3-rc1", "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\nrapidio: mport_cdev: fix use-after-free in dma_req_free()\n\ndma_req_free() acquires buf_mutex through req->map, drops the mapping\nreference with kref_put(), and then dereferences req->map again to unlock\nthe mutex.\n\nIf kref_put() drops the last reference, mport_release_mapping() frees the\nmapping, and the subsequent mutex_unlock() dereferences a freed object. \nThis is a use-after-free.\n\nFix this by caching map and md before kref_put(), clearing req->map while\nholding buf_mutex, and using the cached md for mutex unlocking.\n\nThe bug is reachable from userspace via the RapidIO mport character device\ninterface."}], "id": "CVE-2026-89742", "lastModified": "2026-09-11T20:20:04.863", "metrics": {}, "published": "2026-09-11T20:20:04.863", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/211c68d817a3d9dc14c0026a59da7cac30f8147e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5cbef379a94b161726c5f504598bf4791d45cedc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9a9929ec875ff20922c90c96fd544ae8a2a61a8d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e6e925cc1f8067c65c7bec3da50a0ead3b3ef4e0"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: Arbitrary code execution via use-after-free in RapidIO mport character device.", "id": "2532155", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532155"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in the Linux kernel. A local user could exploit a use-after-free vulnerability in the `dma_req_free()` function within the RapidIO mport character device interface. This flaw occurs when the `dma_req_free()` function attempts to dereference a freed object after dropping the last reference to a mapping. Successful exploitation of this vulnerability could lead to arbitrary code execution or a denial of service."], "name": "CVE-2026-89742", "public_date": "2026-09-11T19:46:48Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89742\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89742\nhttps://git.kernel.org/stable/c/211c68d817a3d9dc14c0026a59da7cac30f8147e\nhttps://git.kernel.org/stable/c/5cbef379a94b161726c5f504598bf4791d45cedc\nhttps://git.kernel.org/stable/c/9a9929ec875ff20922c90c96fd544ae8a2a61a8d\nhttps://git.kernel.org/stable/c/e6e925cc1f8067c65c7bec3da50a0ead3b3ef4e0"], "threat_severity": "Moderate"}

{}