{"id":"CVE-2026-89592","summary":"accel/rocket: fix NULL dereference and integer overflow in rocket_job_push()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\naccel/rocket: fix NULL dereference and integer overflow in rocket_job_push()\n\nrocket_job_push() allocates a temporary array to hold all input and\noutput GEM object pointers:\n\n    bos = kvmalloc_array(job-\u003ein_bo_count + job-\u003eout_bo_count,\n                         sizeof(void *), GFP_KERNEL);\n    memcpy(bos, job-\u003ein_bos, job-\u003ein_bo_count * sizeof(void *));\n    memcpy(&bos[job-\u003ein_bo_count], job-\u003eout_bos, ...);\n\nTwo bugs exist:\n\n1. Missing NULL check: if kvmalloc_array() fails, bos is NULL and\n   the subsequent memcpy() dereferences it, causing a kernel NULL\n   pointer dereference.\n\n2. Integer overflow: in_bo_count and out_bo_count are both u32, set\n   directly from userspace-supplied in_bo_handle_count and\n   out_bo_handle_count with no prior validation. Their sum is computed\n   in u32 arithmetic and can wrap to a smaller value, causing the\n   allocation count passed to kvmalloc_array() to be smaller than\n   intended. Subsequent uses still operate on the original counts when\n   copying and locking objects, which may lead to out-of-bounds accesses\n   on the temporary array.\n\nFix by using check_add_overflow() to detect count overflow before the\nallocation, and adding a NULL check on the allocation result.","modified":"2026-09-13T03:47:19.571028511Z","published":"2026-09-11T19:44:55.813Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89592.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/a85402bff218f2b8f0d806e46c16c2f3d49cdda7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c1a5bf1b6e1d5944183dcef3844a18c17219af4d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/dfff90a6eb2258e3b867994ae17af4a7ba3504d2"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89592.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89592"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0810d5ad88a18f1e6d549853a388ad0316f74e36"},{"fixed":"c1a5bf1b6e1d5944183dcef3844a18c17219af4d"},{"fixed":"dfff90a6eb2258e3b867994ae17af4a7ba3504d2"},{"fixed":"a85402bff218f2b8f0d806e46c16c2f3d49cdda7"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89592.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.18.0"},{"fixed":"6.18.50"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89592.json"}}],"schema_version":"1.9.0"}