CVE-2026-64426 (GCVE-0-2026-64426)
Vulnerability from cvelistv5 – Published: 2026-07-25 08:51 – Updated: 2026-07-25 08:51
VLAI
EPSS
VEX
Title
io_uring/nop: fix file reference leak with IOSQE_FIXED_FILE
Summary
In the Linux kernel, the following vulnerability has been resolved:
io_uring/nop: fix file reference leak with IOSQE_FIXED_FILE
NOP file-acquisition support choses between a fixed (registered) file and
a normal fget()'d file based on its own IORING_NOP_FIXED_FILE flag in
sqe->nop_flags. However, a request's REQ_F_FIXED_FILE is set
independently from the generic IOSQE_FIXED_FILE sqe flag during request
init, before the issue handler runs.
If a NOP is submitted with IOSQE_FIXED_FILE set (so REQ_F_FIXED_FILE is
set) but without IORING_NOP_FIXED_FILE, io_nop() takes the normal path
and grabs a real reference via io_file_get_normal(). On completion,
io_put_file() only drops the reference when REQ_F_FIXED_FILE is clear,
so the fget()'d file is never released and leaks:
BUG: memory leak
unreferenced object 0xffff88800f42c240 (size 176):
kmem_cache_alloc_noprof+0x358/0x440
alloc_empty_file+0x57/0x180
path_openat+0x44/0x1e50
do_file_open+0x121/0x200
do_sys_openat2+0xa7/0x150
__x64_sys_openat+0x82/0xf0
Decide between fixed and normal file acquisition from REQ_F_FIXED_FILE,
the same way io_assign_file() does for every other opcode, and fold
IORING_NOP_FIXED_FILE into REQ_F_FIXED_FILE at prep time.
Severity
No CVSS data available.
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
a85f31052bce52111b4e9d5a536003481d0421d0 , < 722869fcff598fad20d5ab79c305897a7534708b
(git)
Affected: a85f31052bce52111b4e9d5a536003481d0421d0 , < 7267717f35787167fcce4bc14f6ef3fa06682dcf (git) Affected: a85f31052bce52111b4e9d5a536003481d0421d0 , < 2564ca2e31bd8ee8348362941af2ee4671e487ca (git) |
|
| Linux | Linux |
Affected:
6.13
Unaffected: 0 , < 6.13 (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix) |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"io_uring/nop.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "722869fcff598fad20d5ab79c305897a7534708b",
"status": "affected",
"version": "a85f31052bce52111b4e9d5a536003481d0421d0",
"versionType": "git"
},
{
"lessThan": "7267717f35787167fcce4bc14f6ef3fa06682dcf",
"status": "affected",
"version": "a85f31052bce52111b4e9d5a536003481d0421d0",
"versionType": "git"
},
{
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"status": "affected",
"version": "a85f31052bce52111b4e9d5a536003481d0421d0",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"io_uring/nop.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.13"
},
{
"lessThan": "6.13",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.39",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "7.1.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2-rc1",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.39",
"versionStartIncluding": "6.13",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.4",
"versionStartIncluding": "6.13",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2-rc1",
"versionStartIncluding": "6.13",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/nop: fix file reference leak with IOSQE_FIXED_FILE\n\nNOP file-acquisition support choses between a fixed (registered) file and\na normal fget()\u0027d file based on its own IORING_NOP_FIXED_FILE flag in\nsqe-\u003enop_flags. However, a request\u0027s REQ_F_FIXED_FILE is set\nindependently from the generic IOSQE_FIXED_FILE sqe flag during request\ninit, before the issue handler runs.\n\nIf a NOP is submitted with IOSQE_FIXED_FILE set (so REQ_F_FIXED_FILE is\nset) but without IORING_NOP_FIXED_FILE, io_nop() takes the normal path\nand grabs a real reference via io_file_get_normal(). On completion,\nio_put_file() only drops the reference when REQ_F_FIXED_FILE is clear,\nso the fget()\u0027d file is never released and leaks:\n\n BUG: memory leak\n unreferenced object 0xffff88800f42c240 (size 176):\n kmem_cache_alloc_noprof+0x358/0x440\n alloc_empty_file+0x57/0x180\n path_openat+0x44/0x1e50\n do_file_open+0x121/0x200\n do_sys_openat2+0xa7/0x150\n __x64_sys_openat+0x82/0xf0\n\nDecide between fixed and normal file acquisition from REQ_F_FIXED_FILE,\nthe same way io_assign_file() does for every other opcode, and fold\nIORING_NOP_FIXED_FILE into REQ_F_FIXED_FILE at prep time."
}
],
"providerMetadata": {
"dateUpdated": "2026-07-25T08:51:03.867Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/722869fcff598fad20d5ab79c305897a7534708b"
},
{
"url": "https://git.kernel.org/stable/c/7267717f35787167fcce4bc14f6ef3fa06682dcf"
},
{
"url": "https://git.kernel.org/stable/c/2564ca2e31bd8ee8348362941af2ee4671e487ca"
}
],
"title": "io_uring/nop: fix file reference leak with IOSQE_FIXED_FILE",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-64426",
"datePublished": "2026-07-25T08:51:03.867Z",
"dateReserved": "2026-07-19T15:36:31.787Z",
"dateUpdated": "2026-07-25T08:51:03.867Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-64426",
"date": "2026-07-26",
"epss": "0.00166",
"percentile": "0.06207"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-64426\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-25T10:17:26.737\",\"lastModified\":\"2026-07-25T10:17:26.737\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nio_uring/nop: fix file reference leak with IOSQE_FIXED_FILE\\n\\nNOP file-acquisition support choses between a fixed (registered) file and\\na normal fget()\u0027d file based on its own IORING_NOP_FIXED_FILE flag in\\nsqe-\u003enop_flags. However, a request\u0027s REQ_F_FIXED_FILE is set\\nindependently from the generic IOSQE_FIXED_FILE sqe flag during request\\ninit, before the issue handler runs.\\n\\nIf a NOP is submitted with IOSQE_FIXED_FILE set (so REQ_F_FIXED_FILE is\\nset) but without IORING_NOP_FIXED_FILE, io_nop() takes the normal path\\nand grabs a real reference via io_file_get_normal(). On completion,\\nio_put_file() only drops the reference when REQ_F_FIXED_FILE is clear,\\nso the fget()\u0027d file is never released and leaks:\\n\\n BUG: memory leak\\n unreferenced object 0xffff88800f42c240 (size 176):\\n kmem_cache_alloc_noprof+0x358/0x440\\n alloc_empty_file+0x57/0x180\\n path_openat+0x44/0x1e50\\n do_file_open+0x121/0x200\\n do_sys_openat2+0xa7/0x150\\n __x64_sys_openat+0x82/0xf0\\n\\nDecide between fixed and normal file acquisition from REQ_F_FIXED_FILE,\\nthe same way io_assign_file() does for every other opcode, and fold\\nIORING_NOP_FIXED_FILE into REQ_F_FIXED_FILE at prep time.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"io_uring/nop.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"a85f31052bce52111b4e9d5a536003481d0421d0\",\"lessThan\":\"722869fcff598fad20d5ab79c305897a7534708b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a85f31052bce52111b4e9d5a536003481d0421d0\",\"lessThan\":\"7267717f35787167fcce4bc14f6ef3fa06682dcf\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a85f31052bce52111b4e9d5a536003481d0421d0\",\"lessThan\":\"2564ca2e31bd8ee8348362941af2ee4671e487ca\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"io_uring/nop.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.13\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.13\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.39\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.4\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2564ca2e31bd8ee8348362941af2ee4671e487ca\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/722869fcff598fad20d5ab79c305897a7534708b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7267717f35787167fcce4bc14f6ef3fa06682dcf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
"suse_vex": {
"aggregate_severity": "not set",
"current_release_date": "2026-07-25T15:59:34Z",
"cve": "CVE-2026-64426",
"id": "CVE-2026-64426",
"initial_release_date": "2026-07-25T15:59:34Z",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-64426",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64426.json",
"version": "2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
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