CVE-2026-64033

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If a later step fails, the cleanup currently calls\nkobject_put(&srv_path->kobj) before\nrtrs_srv_destroy_once_sysfs_root_folders(srv_path).\n\nkobject_put() may drop the last reference to srv_path->kobj and invoke the\nrelease callback, rtrs_srv_release(), which frees srv_path. The following\ncall to rtrs_srv_destroy_once_sysfs_root_folders(srv_path) then\ndereferences srv_path internally to access srv_path->srv, resulting in a\nuse-after-free.\n\nThis failure path is reached before rtrs_srv_create_path_files() returns\nsuccess, so the successful-path lifetime handling is not involved.\n\nFix this by destroying the sysfs root folders before calling\nkobject_put(&srv_path->kobj), so srv_path is still valid while the helper\naccesses it.\n\nThis issue was found by a static analysis tool I am developing."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - The vulnerable code runs in the RTRS server RDMA CM handler when a remote peer completes connection setup and sends RTRS_MSG_INFO_REQ; the server listens on network addresses via rdma_listen() on IPv6 and IB port spaces (default port 1234, used by rnbd-server).\nAC:L - This is a deterministic cleanup-order UAF, not a race; once the attacker drives sysfs creation into an error path (e.g., via parallel connection attempts causing allocation failures), the bug triggers reliably on every failed setup.\nPR:N - No Linux credentials are required; any remote RTRS/RNBD client that can reach the server's RDMA listener can complete the pre-authentication connection and info-request handshake that calls rtrs_srv_create_path_files().\nUI:N - Exploitation is fully automated through the RTRS wire protocol and requires no action from a local user or administrator on the target host.\nS:U - Impact is confined to kernel memory corruption and privilege escalation on the RTRS server host; it does not cross a VM, container, or IOMMU security boundary by itself.\nC:H - The use-after-free dereferences freed srv_path memory (including srv_path->srv) during cleanup, which can leak kernel heap contents or be turned into an arbitrary read primitive through heap grooming.\nI:H - UAF on a kernel heap object enables control of freed memory contents and can be leveraged for arbitrary kernel writes or code execution via heap spraying and structure reuse.\nA:H - The UAF dereference during error cleanup can cause kernel oops/panic on the RTRS server, and successful exploitation can crash or fully compromise the host."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/infiniband/ulp/rtrs/rtrs-srv-sysfs.c"], "versions": [{"version": "bab17b761c8974a869b04462be5d4dd9aad366b4", "lessThan": "01e42aabaf7632beb4bf235c7238b96c746d4144", "status": "affected", "versionType": "git"}, {"version": "ae4c81644e9105d9f7f713bb0d444737bb6a0cf1", "lessThan": "548f3956e53a7f7bde912d8129010b8986d5e602", "status": "affected", "versionType": "git"}, {"version": "ae4c81644e9105d9f7f713bb0d444737bb6a0cf1", "lessThan": "00904a73272b9f3ef3952fe69a833909dccad1ef", "status": "affected", "versionType": "git"}, {"version": "ae4c81644e9105d9f7f713bb0d444737bb6a0cf1", "lessThan": "92060ab1c5115674cf319175550f85f68405121f", "status": "affected", "versionType": "git"}, {"version": "ae4c81644e9105d9f7f713bb0d444737bb6a0cf1", "lessThan": "eae62c5451e67e8b033c1681fd3b85d7e9a9a28f", "status": "affected", "versionType": "git"}, {"version": "ae4c81644e9105d9f7f713bb0d444737bb6a0cf1", "lessThan": "b0e9706fb2859064bb6c677554c4d20c713aa8e0", "status": "affected", "versionType": "git"}, {"version": "ae4c81644e9105d9f7f713bb0d444737bb6a0cf1", "lessThan": "5b74373390113fba798a76b483837029ab010fef", "status": "affected", "versionType": "git"}, {"version": "5.15.61", "lessThan": "5.15.209", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/infiniband/ulp/rtrs/rtrs-srv-sysfs.c"], "versions": [{"version": "5.17", "status": "affected"}, {"version": "0", "lessThan": "5.17", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.209", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.142", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.92", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.34", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.11", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "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": "5.15.61", "versionEndExcluding": "5.15.209"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.1.175"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.6.142"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.12.92"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.18.34"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "7.0.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/01e42aabaf7632beb4bf235c7238b96c746d4144"}, {"url": "https://git.kernel.org/stable/c/548f3956e53a7f7bde912d8129010b8986d5e602"}, {"url": "https://git.kernel.org/stable/c/00904a73272b9f3ef3952fe69a833909dccad1ef"}, {"url": "https://git.kernel.org/stable/c/92060ab1c5115674cf319175550f85f68405121f"}, {"url": "https://git.kernel.org/stable/c/eae62c5451e67e8b033c1681fd3b85d7e9a9a28f"}, {"url": "https://git.kernel.org/stable/c/b0e9706fb2859064bb6c677554c4d20c713aa8e0"}, {"url": "https://git.kernel.org/stable/c/5b74373390113fba798a76b483837029ab010fef"}], "title": "RDMA/rtrs: Fix use-after-free in path file creation cleanup", "x_generator": {"engine": "bippy-1.2.0"}}}}

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If a later step fails, the cleanup currently calls\nkobject_put(&srv_path->kobj) before\nrtrs_srv_destroy_once_sysfs_root_folders(srv_path).\n\nkobject_put() may drop the last reference to srv_path->kobj and invoke the\nrelease callback, rtrs_srv_release(), which frees srv_path. The following\ncall to rtrs_srv_destroy_once_sysfs_root_folders(srv_path) then\ndereferences srv_path internally to access srv_path->srv, resulting in a\nuse-after-free.\n\nThis failure path is reached before rtrs_srv_create_path_files() returns\nsuccess, so the successful-path lifetime handling is not involved.\n\nFix this by destroying the sysfs root folders before calling\nkobject_put(&srv_path->kobj), so srv_path is still valid while the helper\naccesses it.\n\nThis issue was found by a static analysis tool I am developing."}], "id": "CVE-2026-64033", "lastModified": "2026-10-13T15:32:56.607", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-07-19T16:17:43.493", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/00904a73272b9f3ef3952fe69a833909dccad1ef"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/01e42aabaf7632beb4bf235c7238b96c746d4144"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/548f3956e53a7f7bde912d8129010b8986d5e602"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5b74373390113fba798a76b483837029ab010fef"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/92060ab1c5115674cf319175550f85f68405121f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b0e9706fb2859064bb6c677554c4d20c713aa8e0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/eae62c5451e67e8b033c1681fd3b85d7e9a9a28f"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: RDMA/rtrs: Fix use-after-free in path file creation cleanup", "id": "2502328", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502328"}, "csaw": false, "cwe": "CWE-825", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nRDMA/rtrs: Fix use-after-free in path file creation cleanup\nIn the error path of rtrs_srv_create_path_files(), the sysfs root folders\nmay already have been created and srv_path->kobj may already have been\ninitialized. If a later step fails, the cleanup currently calls\nkobject_put(&srv_path->kobj) before\nrtrs_srv_destroy_once_sysfs_root_folders(srv_path).\nkobject_put() may drop the last reference to srv_path->kobj and invoke the\nrelease callback, rtrs_srv_release(), which frees srv_path. The following\ncall to rtrs_srv_destroy_once_sysfs_root_folders(srv_path) then\ndereferences srv_path internally to access srv_path->srv, resulting in a\nuse-after-free.\nThis failure path is reached before rtrs_srv_create_path_files() returns\nsuccess, so the successful-path lifetime handling is not involved.\nFix this by destroying the sysfs root folders before calling\nkobject_put(&srv_path->kobj), so srv_path is still valid while the helper\naccesses it.\nThis issue was found by a static analysis tool I am developing.", "A flaw was found in the Linux kernel's Remote Direct Memory Access (RDMA) subsystem, specifically within the rtrs module. An incorrect cleanup sequence during path file creation can lead to a use-after-free vulnerability. This issue occurs when an object is deallocated prematurely, and subsequent operations attempt to access the freed memory, which may result in a system crash (denial of service) or potentially lead to arbitrary code execution."], "name": "CVE-2026-64033", "package_state": [{"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "impact": "important", "package_name": "erlang27", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64033\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64033\nhttps://lore.kernel.org/linux-cve-announce/2026071904-CVE-2026-64033-b08e@gregkh/T"]}

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