{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-64033", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.028Z", "datePublished": "2026-07-19T15:39:22.872Z", "dateUpdated": "2026-08-05T12:38:27.449Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:38:27.449Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rtrs: Fix use-after-free in path file creation cleanup\n\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).\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" } } } }