{"apiVersion":"1.0","identifier":"CVE-2026-74584","description":"In the Linux kernel, the following vulnerability has been resolved: RDMA/bnxt_re: zero shared page before exposing to userspace bnxt_re_alloc_ucontext() allocates uctx->shpg via __get_free_page(GFP_KERNEL). The buddy allocator does not zero pages without __GFP_ZERO, so the page contains stale kernel data from whatever object most recently freed it. The page is then mapped into userspace via vm_insert_page() under BNXT_RE_MMAP_SH_PAGE in bnxt_re_mmap(). The driver only ever writes 4 bytes (a u32 AVID) at offset BNXT_RE_AVID_OFFT (0x10) inside bnxt_re_create_ah(); the remaining 4092 bytes of the page are exposed to userspace unsanitised, leaking kernel memory contents. Any user with access to /dev/infiniband/uverbsX on a host with a bnxt_re device (typically rdma group membership) can read this data via a single mmap() at pgoff 0 after IB_USER_VERBS_CMD_GET_CONTEXT. Other shared pages in the same file already use get_zeroed_page() correctly: drivers/infiniband/hw/bnxt_re/ib_verbs.c srq->uctx_srq_page = (void *)get_zeroed_page(GFP_KERNEL); cq->uctx_cq_page = (void *)get_zeroed_page(GFP_KERNEL); uctx->shpg is the only outlier. Bring it in line with the existing convention by switching to get_zeroed_page().","publishedAt":"2026-08-22T15:16:21","lastModifiedAt":"2026-08-25T06:18:32","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-74584","cvssScore":7.1,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","epssProbability":0.00131,"riskScore":0.72,"affectedProduct":"Linux kernel","affectedVersions":"unknown","vulnerabilityType":"Kernel","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-74584","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-74584","en":"https://www.redsauce.net/en/cves/CVE-2026-74584","fr":"https://www.redsauce.net/fr/cves/CVE-2026-74584","pt":"https://www.redsauce.net/pt/cves/CVE-2026-74584","de":"https://www.redsauce.net/de/cves/CVE-2026-74584","sk":"https://www.redsauce.net/sk/cves/CVE-2026-74584","el":"https://www.redsauce.net/el/cves/CVE-2026-74584"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-74584"}}