RDMA/bnxt_re: zero shared page before exposing to userspace
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().
CVE-2026-74584
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-74584
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "1ac5a404797523cedaf424a3aaa3cf8f9548dff8",
"lessThan": "53c97e9882f4e747b4ac31b211317c2eba541af9",
"versionType": "git"
},
{
"status": "affected",
"version": "1ac5a404797523cedaf424a3aaa3cf8f9548dff8",
"lessThan": "9896bdfd21d918e9f26a52bc6109cc77970ee0b1",
"versionType": "git"
},
{
"status": "affected",
"version": "1ac5a404797523cedaf424a3aaa3cf8f9548dff8",
"lessThan": "9128c2411b83a64c0a69d2ff059c741bde25a9cc",
"versionType": "git"
},
{
"status": "affected",
"version": "1ac5a404797523cedaf424a3aaa3cf8f9548dff8",
"lessThan": "c19b360fa10c521c0b681875cdaa51545d45a491",
"versionType": "git"
},
{
"status": "affected",
"version": "1ac5a404797523cedaf424a3aaa3cf8f9548dff8",
"lessThan": "a3ed2daab02b2a706e882ad31b5c3c4f33cb5bb1",
"versionType": "git"
},
{
"status": "affected",
"version": "1ac5a404797523cedaf424a3aaa3cf8f9548dff8",
"lessThan": "e2b143df29003d2704b51f62e9297006953dbacb",
"versionType": "git"
},
{
"status": "affected",
"version": "1ac5a404797523cedaf424a3aaa3cf8f9548dff8",
"lessThan": "c75f8ce4baa29ae57fe615c6a2c5101f59b8b89a",
"versionType": "git"
},
{
"status": "affected",
"version": "1ac5a404797523cedaf424a3aaa3cf8f9548dff8",
"lessThan": "f6b079629becfa977f9c51fe53ad2e6dcc55ef44",
"versionType": "git"
}
],
"programFiles": [
"drivers/infiniband/hw/bnxt_re/ib_verbs.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.11"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.11",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.260",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.211",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.177",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.144",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.95",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.37",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.0.14",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/infiniband/hw/bnxt_re/ib_verbs.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74584
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #33224 · Revision 1
- Added to Heist Feed
- Publisher date