CVE-2026-74377 (GCVE-0-2026-74377)
Vulnerability from cvelistv5
Published
2026-08-15 05:58
Modified
2026-08-17 05:46
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
RDMA/rxe: Copy WQE to local buffer in non-SRQ receive path
For non-SRQ QPs, the responder reads WQE fields directly from the
shared queue buffer mapped into userspace. This allows a malicious
user to modify fields like num_sge or sge entries while the kernel
is processing the WQE, leading to out-of-bounds reads in
rxe_resp_check_length() and copy_data().
Introduce get_recv_wqe() that validates num_sge and copies the WQE
to a kernel-local buffer before processing, matching the approach
already used for SRQ WQEs in get_srq_wqe(). The srq_wqe buffer is
reused since SRQ and non-SRQ paths are mutually exclusive per QP.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 8700e3e7c4857d28ebaa824509934556da0b3e76 Version: 8700e3e7c4857d28ebaa824509934556da0b3e76 Version: 8700e3e7c4857d28ebaa824509934556da0b3e76 Version: 8700e3e7c4857d28ebaa824509934556da0b3e76 Version: 8700e3e7c4857d28ebaa824509934556da0b3e76 Version: 8700e3e7c4857d28ebaa824509934556da0b3e76 |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/infiniband/sw/rxe/rxe_resp.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
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]
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{
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"product": "Linux",
"programFiles": [
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "4.8"
},
{
"lessThan": "4.8",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.97",
"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": "6.1.178",
"versionStartIncluding": "4.8",
"vulnerable": true
},
{
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},
{
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},
{
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},
{
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{
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"versionStartIncluding": "4.8",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rxe: Copy WQE to local buffer in non-SRQ receive path\n\nFor non-SRQ QPs, the responder reads WQE fields directly from the\nshared queue buffer mapped into userspace. This allows a malicious\nuser to modify fields like num_sge or sge entries while the kernel\nis processing the WQE, leading to out-of-bounds reads in\nrxe_resp_check_length() and copy_data().\n\nIntroduce get_recv_wqe() that validates num_sge and copies the WQE\nto a kernel-local buffer before processing, matching the approach\nalready used for SRQ WQEs in get_srq_wqe(). The srq_wqe buffer is\nreused since SRQ and non-SRQ paths are mutually exclusive per QP."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - Exploitation requires mutating mmap\u0027d receive WQEs through /dev/infiniband/uverbs; inbound RoCE packets (rxe_udp_encap_recv\u2192rxe_rcv\u2192rxe_receiver) only trigger processing and cannot alter WQE fields without local control of the userspace-mapped receive queue.\nAC:L - The attacker controls both sides of the TOCTOU\u2014userspace threads racing num_sge/sge edits while posting recv WRs and driving inbound RoCE SEND/WRITE traffic\u2014so out-of-bounds reads in rxe_resp_check_length() and copy_data() are reliably triggerable with retries.\nPR:L - uverbs_devnode() publishes /dev/infiniband/uverbsN as mode 0666, letting any local account create userspace QPs and mmap receive queues; rxe link setup needs CAP_NET_ADMIN obtainable in a user+network namespace via unshare -Urn, matching PR:L kernel guidance.\nUI:N - Exploitation is entirely self-driven from the attacker\u0027s own RDMA verbs client and concurrent userspace threads; no victim user action, mount, or file open is required.\nS:U - Impact is kernel memory corruption and local privilege escalation within the host kernel security authority, not a VM guest-to-host escape, IOMMU/DMA boundary bypass, or other cross-scope compromise.\nC:H - Inflating num_sge or rewriting sge entries during processing causes out-of-bounds reads in rxe_resp_check_length() and copy_data() beyond the allocated WQE slot, potentially into adjacent vmalloc/kernel memory, enabling arbitrary kernel information disclosure.\nI:H - copy_data() walks attacker-forged out-of-bounds sge entries and performs rxe_mr_copy writes of incoming RDMA payload into MR-backed memory; combined with queue overruns this yields controlled memory corruption exploitable for arbitrary write and code execution.\nA:H - Processing a WQE with an attacker-inflated num_sge causes the kernel to walk far past valid sge slots, dereferencing invalid pointers and corrupting memory, reliably producing kernel oops/panic and total loss of availability."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T05:46:29.745Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/2e60378fb3c8b51c94103bb40014c4fe38fa5033"
},
{
"url": "https://git.kernel.org/stable/c/fc72fd61cc8b2e2e3e92ae4c0e9cc30c9a7ecb78"
},
{
"url": "https://git.kernel.org/stable/c/9fa785137303f7109c23dea779b8dedc67c9b531"
},
{
"url": "https://git.kernel.org/stable/c/5420eebf3b3c162bfaf965f30e61cd1d689e5732"
},
{
"url": "https://git.kernel.org/stable/c/a211b7904aed365e4e4f08a48ec6e6dd1ea7b16b"
},
{
"url": "https://git.kernel.org/stable/c/d6ab440240a04b8737ee4c7bb21af9182e451733"
}
],
"title": "RDMA/rxe: Copy WQE to local buffer in non-SRQ receive path",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-74377",
"datePublished": "2026-08-15T05:58:55.704Z",
"dateReserved": "2026-08-15T05:44:03.889Z",
"dateUpdated": "2026-08-17T05:46:29.745Z",
"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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