{"cve":"CVE-2026-74584","nvd":{"published":"2026-08-22T15:16:21.230","modified":"2026-10-16T20:17:40.707","status":"Received","description":"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().","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","score":7.1},"cwes":[],"references":["https://git.kernel.org/stable/c/53c97e9882f4e747b4ac31b211317c2eba541af9","https://git.kernel.org/stable/c/9128c2411b83a64c0a69d2ff059c741bde25a9cc","https://git.kernel.org/stable/c/9896bdfd21d918e9f26a52bc6109cc77970ee0b1","https://git.kernel.org/stable/c/a3ed2daab02b2a706e882ad31b5c3c4f33cb5bb1","https://git.kernel.org/stable/c/c19b360fa10c521c0b681875cdaa51545d45a491"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:49:38.260478770+00:00"},"epss":{"cve":"CVE-2026-74584","score":0.00182,"percentile":0.07755,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}