CVE-2026-72495 (GCVE-0-2026-72495)
Vulnerability from cvelistv5
Published
2026-08-15 05:57
Modified
2026-08-17 05:44
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
RDMA/bnxt_re: Avoid repeated requests to allocate WC pages
Applications can request multiple WC pages for the same ucontext.
As of now, only 1 WC page per ucontext is supported. Add a lock to
avoid concurrent access and a check to fail repeated requests.
Also, if the mmap entry insert fails for the WC, free the Doorbell
page index mapped for the WC page.
References
Impacted products
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/infiniband/hw/bnxt_re/ib_verbs.c",
"drivers/infiniband/hw/bnxt_re/ib_verbs.h",
"drivers/infiniband/hw/bnxt_re/uapi.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "478c4d24193fe3e6aa2accd4874ae43000e4a217",
"status": "affected",
"version": "360da60d6c6edb9740de7a8e6d8969d62ceff956",
"versionType": "git"
},
{
"lessThan": "da406b8b49c1dfe661a497483940d7ee781430db",
"status": "affected",
"version": "360da60d6c6edb9740de7a8e6d8969d62ceff956",
"versionType": "git"
},
{
"lessThan": "441baa79043431807115fd030d7d0bb14ed441a0",
"status": "affected",
"version": "360da60d6c6edb9740de7a8e6d8969d62ceff956",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/infiniband/hw/bnxt_re/ib_verbs.c",
"drivers/infiniband/hw/bnxt_re/ib_verbs.h",
"drivers/infiniband/hw/bnxt_re/uapi.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.5"
},
{
"lessThan": "6.5",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.40",
"versionStartIncluding": "6.5",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.5",
"versionStartIncluding": "6.5",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "6.5",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/bnxt_re: Avoid repeated requests to allocate WC pages\n\nApplications can request multiple WC pages for the same ucontext.\nAs of now, only 1 WC page per ucontext is supported. Add a lock to\navoid concurrent access and a check to fail repeated requests.\nAlso, if the mmap entry insert fails for the WC, free the Doorbell\npage index mapped for the WC page."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 9.3,
"baseSeverity": "CRITICAL",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The flaw is in BNXT_RE_METHOD_ALLOC_PAGE, reached only via write/ioctl on /dev/infiniband/uverbs* after IB ucontext creation; remote RoCE packet handling and in-kernel RDMA target/server paths never invoke this WC DPI allocation routine.\nAC:L - An attacker can deterministically trigger the bug by issuing repeated or concurrent BNXT_RE_ALLOC_WC_PAGE calls from multiple threads on the same ucontext; they control both sides of the race and need no uncontrollable memory layout or victim-specific state.\nPR:N - Standard uverbs character devices are created mode 0666, so any local process can open the bnxt_re device, allocate a ucontext, and invoke BNXT_RE_METHOD_ALLOC_PAGE without CAP_SYS_ADMIN, init-namespace root, or other elevated capabilities.\nUI:N - No victim interaction is required; exploitation needs only the attacker (or a compromised local RDMA workload) repeatedly or concurrently calling ALLOC_PAGE on resources it already controls through normal RDMA verbs.\nS:C - On HPC/cloud hosts exposing bnxt_re to tenant containers or unprivileged RDMA workloads, corrupting shared per-device DPI bookkeeping or exhausting finite doorbell indices crosses the container/tenant boundary to impact the host/kernel security authority.\nC:H - Without serialization or duplicate checks, corrupt DPI index bookkeeping and premature slot reuse can alias WC doorbell BAR pages across contexts, exposing other users\u0027 doorbell state and providing resource-corruption primitives usable for information disclosure.\nI:H - Destroying one ALLOC_PAGE object can deallocate another object\u0027s live WC DPI slot while its BAR mmap remains active, letting a later allocation share the same doorbell page and enabling cross-context WC doorbell writes that corrupt other tenants\u0027 RDMA queue signaling.\nA:H - Each orphaned DPI entry permanently consumes a finite per-device doorbell index (exhaustible via repeated or concurrent ALLOC_PAGE), denying RDMA service cluster-wide; unsynchronized wcdpi updates can also destabilize kernel DPI teardown paths."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T05:44:56.649Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/478c4d24193fe3e6aa2accd4874ae43000e4a217"
},
{
"url": "https://git.kernel.org/stable/c/da406b8b49c1dfe661a497483940d7ee781430db"
},
{
"url": "https://git.kernel.org/stable/c/441baa79043431807115fd030d7d0bb14ed441a0"
}
],
"title": "RDMA/bnxt_re: Avoid repeated requests to allocate WC pages",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-72495",
"datePublished": "2026-08-15T05:57:28.920Z",
"dateReserved": "2026-08-09T03:40:39.937Z",
"dateUpdated": "2026-08-17T05:44:56.649Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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