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vuln-cve/data/2026/74xxx/CVE-2026-74334.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-74334",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-08-15T05:44:03.885Z",
"datePublished": "2026-08-15T05:58:26.455Z",
"dateUpdated": "2026-10-16T18:55:33.821Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-09-14T11:58:43.928Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/nldev: Fix locking when accessing mr->pd\n\nSashiko points out that, due to rereg_mr, the PD is actually variable and\nall the touches in nldev are racy.\n\nUse mr->device instead of mr->pd->device.\n\nGetting the PD restrack ID is more tricky. To avoid disturbing all the\nhappy paths, add an rdma_restrack_sync() operation which is sort of like\nflush_workqueue() or synchronize_irq(): after it returns, all the old\nnldev touches to the mr are gone and everything sees the new PD. This\nmakes it safe to reach into the PD pointer."
}
],
"metrics": [
{
"cvssV3_1": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 7.8,
"baseSeverity": "HIGH"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The bug is reached via local NETLINK_RDMA nldev MR resource dumps and concurrent IB_USER_VERBS_CMD_REREG_MR ioctl on /dev/infiniband/uverbs; it is not triggered by remote RDMA/InfiniBand/RoCE network traffic.\nAC:L - An attacker controls both race sides by spawning threads that hammer rereg_mr with IB_MR_REREG_PD and nldev RES_MR_GET dumps, optionally deallocating the old PD; no timing or layout conditions outside attacker control are required.\nPR:L - Exploitation needs only local uverbs access (device nodes default 0666) plus NETLINK_RDMA dumps; CAP_NET_ADMIN for netlink send is obtainable by unprivileged users via user namespaces, not real init-namespace root.\nUI:N - No victim interaction is required; the attacker triggers both the rereg_mr PD change and the concurrent nldev MR dump from their own process.\nS:U - Impact is kernel heap corruption and privilege escalation within the host kernel security boundary, not a VM escape, IOMMU bypass, or cross-authority sandbox breakout.\nC:H - Concurrent rereg_mr can free the old ib_pd while nldev still dereferences mr->pd for device and res.id, creating a use-after-free that enables arbitrary kernel memory disclosure via controlled reuse of freed slab objects.\nI:H - The ib_pd UAF is exploitable for heap grooming and arbitrary kernel write or control-flow hijack, not merely a bounded data corruption or guaranteed crash.\nA:H - The race reliably causes kernel oops or panic from dereferencing a freed ib_pd during nldev dumps, and UAF exploitation can additionally crash or hang the system during heap manipulation."
}
]
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"drivers/infiniband/core/nldev.c",
"drivers/infiniband/core/restrack.c",
"drivers/infiniband/core/restrack.h",
"drivers/infiniband/core/uverbs_cmd.c",
"include/rdma/ib_verbs.h"
],
"versions": [
{
"version": "da5c8507821573b8ed6e3f47e009f273493ffaf7",
"lessThan": "845c6b355226195dad1f26b300c4830f57034e8b",
"status": "affected",
"versionType": "git"
},
{
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"lessThan": "7a0cbb5721a1da81e902d73b6049f85ca8f3fc0a",
"status": "affected",
"versionType": "git"
},
{
"version": "da5c8507821573b8ed6e3f47e009f273493ffaf7",
"lessThan": "05e26f34597e9c38bb5b340d86b179b23673869f",
"status": "affected",
"versionType": "git"
},
{
"version": "da5c8507821573b8ed6e3f47e009f273493ffaf7",
"lessThan": "a07cba1296aaa81bf9b914486ca957aaff196247",
"status": "affected",
"versionType": "git"
},
{
"version": "da5c8507821573b8ed6e3f47e009f273493ffaf7",
"lessThan": "1a132ee4e655288d9a0937ea5109a0d038431ae9",
"status": "affected",
"versionType": "git"
},
{
"version": "da5c8507821573b8ed6e3f47e009f273493ffaf7",
"lessThan": "50d5c02ab8e62325548bd3a6e6b758a9dcd6e7c3",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"drivers/infiniband/core/nldev.c",
"drivers/infiniband/core/restrack.c",
"drivers/infiniband/core/restrack.h",
"drivers/infiniband/core/uverbs_cmd.c",
"include/rdma/ib_verbs.h"
],
"versions": [
{
"version": "4.18",
"status": "affected"
},
{
"version": "0",
"lessThan": "4.18",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.188",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.157",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.110",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.18.52",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.1.5",
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.2",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.18",
"versionEndExcluding": "6.1.188"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.18",
"versionEndExcluding": "6.6.157"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.18",
"versionEndExcluding": "6.12.110"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.18",
"versionEndExcluding": "6.18.52"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.18",
"versionEndExcluding": "7.1.5"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.18",
"versionEndExcluding": "7.2"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/845c6b355226195dad1f26b300c4830f57034e8b"
},
{
"url": "https://git.kernel.org/stable/c/7a0cbb5721a1da81e902d73b6049f85ca8f3fc0a"
},
{
"url": "https://git.kernel.org/stable/c/05e26f34597e9c38bb5b340d86b179b23673869f"
},
{
"url": "https://git.kernel.org/stable/c/a07cba1296aaa81bf9b914486ca957aaff196247"
},
{
"url": "https://git.kernel.org/stable/c/1a132ee4e655288d9a0937ea5109a0d038431ae9"
},
{
"url": "https://git.kernel.org/stable/c/50d5c02ab8e62325548bd3a6e6b758a9dcd6e7c3"
}
],
"title": "RDMA/nldev: Fix locking when accessing mr->pd",
"x_generator": {
"engine": "bippy-1.2.0"
}
},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"id": "CVE-2026-74334",
"role": "CISA Coordinator",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"version": "2.0.3",
"timestamp": "2026-10-16T18:53:49.608601Z"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-10-16T18:55:33.821Z"
}
}
]
}
}
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