{"id":"CVE-2026-74584","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-74584","summary":"RDMA/bnxt_re: zero shared page before exposing to userspace","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/bnxt_re: zero shared page before exposing to userspace\n\nbnxt_re_alloc_ucontext() allocates uctx->shpg via\n__get_free_page(GFP_KERNEL). The buddy allocator does not zero pages\nwithout __GFP_ZERO, so the page contains stale kernel data from\nwhatever object most recently freed it.\n\nThe page is then mapped into userspace via vm_insert_page() under\nBNXT_RE_MMAP_SH_PAGE in bnxt_re_mmap(). The driver only ever writes\n4 bytes (a u32 AVID) at offset BNXT_RE_AVID_OFFT (0x10) inside\nbnxt_re_create_ah(); the remaining 4092 bytes of the page are exposed\nto userspace unsanitised, leaking kernel memory contents.\n\nAny user with access to /dev/infiniband/uverbsX on a host with a\nbnxt_re device (typically rdma group membership) can read this data\nvia a single mmap() at pgoff 0 after IB_USER_VERBS_CMD_GET_CONTEXT.\n\nOther shared pages in the same file already use get_zeroed_page()\ncorrectly:\n\n  drivers/infiniband/hw/bnxt_re/ib_verbs.c\n      srq->uctx_srq_page = (void *)get_zeroed_page(GFP_KERNEL);\n      cq->uctx_cq_page  = (void *)get_zeroed_page(GFP_KERNEL);\n\nuctx->shpg is the only outlier. Bring it in line with the existing\nconvention by switching to get_zeroed_page().","published":"2026-08-22T14:28:07.988Z","modified":"2026-08-24T11:46:55.994820199Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"5.10.260"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/53c97e9882f4e747b4ac31b211317c2eba541af9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9128c2411b83a64c0a69d2ff059c741bde25a9cc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9896bdfd21d918e9f26a52bc6109cc77970ee0b1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a3ed2daab02b2a706e882ad31b5c3c4f33cb5bb1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c19b360fa10c521c0b681875cdaa51545d45a491"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c75f8ce4baa29ae57fe615c6a2c5101f59b8b89a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e2b143df29003d2704b51f62e9297006953dbacb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f6b079629becfa977f9c51fe53ad2e6dcc55ef44"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74584.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74584"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-24T11:46:55.994820199Z"}}