CVE-2026-74395 (GCVE-0-2026-74395)
Vulnerability from cvelistv5 – Published: 2026-08-15 05:59 – Updated: 2026-08-17 05:18
VLAI
EPSS
VEX
Title
RDMA/mlx5: Fix devx subscribe-event unwind NULL dereference
Summary
In the Linux kernel, the following vulnerability has been resolved:
RDMA/mlx5: Fix devx subscribe-event unwind NULL dereference
MLX5_IB_METHOD_DEVX_SUBSCRIBE_EVENT() links event_sub into sub_list
before initializing the fields used by the shared error path.
If eventfd_ctx_fdget() then fails, the unwind path dereferences
event_sub->ev_file in uverbs_uobject_put() and calls
subscribe_event_xa_dealloc() with an unset xa_key_level1.
subscribe_event_xa_alloc() creates the XA entry exactly once for a given
key_level1, on the first occurrence of that key. The unwind path must
therefore call subscribe_event_xa_dealloc() exactly once for it as well.
Enforce that by adding devx_key_in_sub_list() and calling
subscribe_event_xa_dealloc() only when the last matching pending entry is
being cleaned up.
Severity
No CVSS data available.
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
7597385371425febdaa8c6a1da3625d4ffff16f5 , < 6e15b770461eeaa0ff73934922cb670a6a9db04e
(git)
Affected: 7597385371425febdaa8c6a1da3625d4ffff16f5 , < 9be9aca28424228586fe9211c373ebdb826ebb6c (git) Affected: 7597385371425febdaa8c6a1da3625d4ffff16f5 , < f345e744b6b087188cde2377da5cbe9713b61353 (git) Affected: 7597385371425febdaa8c6a1da3625d4ffff16f5 , < 1025dc2f7ba29b04b8687790fa91f9cd1a53141e (git) Affected: 7597385371425febdaa8c6a1da3625d4ffff16f5 , < 7921821fc2b19c01588311f6e7468ae5b68b1f61 (git) Affected: 7597385371425febdaa8c6a1da3625d4ffff16f5 , < 5100febf8e9d6c8c5ba8dc6534c6a5e3376e5989 (git) Affected: 7597385371425febdaa8c6a1da3625d4ffff16f5 , < 78b9589fda266c71f0f9d0c858d4fa7381a890a5 (git) Affected: 7597385371425febdaa8c6a1da3625d4ffff16f5 , < 43f8f7946814c8e5f464518246fdbc69b6e32326 (git) |
guessed | |
| Linux | Linux |
Affected:
5.3
Unaffected: 0 , < 5.3 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
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},
{
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"status": "unaffected",
"version": "5.10.261",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.212",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.12.97",
"versionType": "semver"
},
{
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"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"
}
]
}
],
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{
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},
{
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"versionStartIncluding": "5.3",
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},
{
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{
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/mlx5: Fix devx subscribe-event unwind NULL dereference\n\nMLX5_IB_METHOD_DEVX_SUBSCRIBE_EVENT() links event_sub into sub_list\nbefore initializing the fields used by the shared error path.\n\nIf eventfd_ctx_fdget() then fails, the unwind path dereferences\nevent_sub-\u003eev_file in uverbs_uobject_put() and calls\nsubscribe_event_xa_dealloc() with an unset xa_key_level1.\n\nsubscribe_event_xa_alloc() creates the XA entry exactly once for a given\nkey_level1, on the first occurrence of that key. The unwind path must\ntherefore call subscribe_event_xa_dealloc() exactly once for it as well.\n\nEnforce that by adding devx_key_in_sub_list() and calling\nsubscribe_event_xa_dealloc() only when the last matching pending entry is\nbeing cleaned up."
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T05:18:34.634Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
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"references": [
{
"url": "https://git.kernel.org/stable/c/6e15b770461eeaa0ff73934922cb670a6a9db04e"
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{
"url": "https://git.kernel.org/stable/c/9be9aca28424228586fe9211c373ebdb826ebb6c"
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{
"url": "https://git.kernel.org/stable/c/f345e744b6b087188cde2377da5cbe9713b61353"
},
{
"url": "https://git.kernel.org/stable/c/1025dc2f7ba29b04b8687790fa91f9cd1a53141e"
},
{
"url": "https://git.kernel.org/stable/c/7921821fc2b19c01588311f6e7468ae5b68b1f61"
},
{
"url": "https://git.kernel.org/stable/c/5100febf8e9d6c8c5ba8dc6534c6a5e3376e5989"
},
{
"url": "https://git.kernel.org/stable/c/78b9589fda266c71f0f9d0c858d4fa7381a890a5"
},
{
"url": "https://git.kernel.org/stable/c/43f8f7946814c8e5f464518246fdbc69b6e32326"
}
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"datePublished": "2026-08-15T05:59:07.798Z",
"dateReserved": "2026-08-15T05:44:03.891Z",
"dateUpdated": "2026-08-17T05:18:34.634Z",
"state": "PUBLISHED"
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{
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/mlx5: Fix devx subscribe-event unwind NULL dereference\n\nMLX5_IB_METHOD_DEVX_SUBSCRIBE_EVENT() links event_sub into sub_list\nbefore initializing the fields used by the shared error path.\n\nIf eventfd_ctx_fdget() then fails, the unwind path dereferences\nevent_sub-\u003eev_file in uverbs_uobject_put() and calls\nsubscribe_event_xa_dealloc() with an unset xa_key_level1.\n\nsubscribe_event_xa_alloc() creates the XA entry exactly once for a given\nkey_level1, on the first occurrence of that key. The unwind path must\ntherefore call subscribe_event_xa_dealloc() exactly once for it as well.\n\nEnforce that by adding devx_key_in_sub_list() and calling\nsubscribe_event_xa_dealloc() only when the last matching pending entry is\nbeing cleaned up."
}
],
"id": "CVE-2026-74395",
"lastModified": "2026-08-17T06:19:34.557",
"metrics": {},
"published": "2026-08-15T06:22:41.480",
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"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-08-20T22:19:04+00:00",
"cve": "CVE-2026-74395",
"id": "CVE-2026-74395",
"initial_release_date": "2026-08-15T00:00:00+00:00",
"product_status:known_affected": "232",
"product_status:known_not_affected": "42",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: RDMA/mlx5: Fix devx subscribe-event unwind NULL dereference",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74395.json",
"version": "3"
}
}
}
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