CVE-2026-23354 (GCVE-0-2026-23354)
Vulnerability from cvelistv5
Published
2026-03-25 10:27
Modified
2026-04-13 06:05
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
x86/fred: Correct speculative safety in fred_extint()
array_index_nospec() is no use if the result gets spilled to the stack, as
it makes the believed safe-under-speculation value subject to memory
predictions.
For all practical purposes, this means array_index_nospec() must be used in
the expression that accesses the array.
As the code currently stands, it's the wrong side of irqentry_enter(), and
'index' is put into %ebp across the function call.
Remove the index variable and reposition array_index_nospec(), so it's
calculated immediately before the array access.
References
| URL | Tags | |
|---|---|---|
Impacted products
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"arch/x86/entry/entry_fred.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "3bc5887b0a2b06d2d9c22f1f4f8500490b3ae643",
"status": "affected",
"version": "14619d912b658ecd9573fb88400d3830a29cadcb",
"versionType": "git"
},
{
"lessThan": "e58f1a9b0677de24dcfee0b21393446ec92ff120",
"status": "affected",
"version": "14619d912b658ecd9573fb88400d3830a29cadcb",
"versionType": "git"
},
{
"lessThan": "92caa5274b99cb6729177232a029ce0dfa6c5f7b",
"status": "affected",
"version": "14619d912b658ecd9573fb88400d3830a29cadcb",
"versionType": "git"
},
{
"lessThan": "aa280a08e7d8fae58557acc345b36b3dc329d595",
"status": "affected",
"version": "14619d912b658ecd9573fb88400d3830a29cadcb",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"arch/x86/entry/entry_fred.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.9"
},
{
"lessThan": "6.9",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.77",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.17",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"version": "6.19.7",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.77",
"versionStartIncluding": "6.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.17",
"versionStartIncluding": "6.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.19.7",
"versionStartIncluding": "6.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.0",
"versionStartIncluding": "6.9",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/fred: Correct speculative safety in fred_extint()\n\narray_index_nospec() is no use if the result gets spilled to the stack, as\nit makes the believed safe-under-speculation value subject to memory\npredictions.\n\nFor all practical purposes, this means array_index_nospec() must be used in\nthe expression that accesses the array.\n\nAs the code currently stands, it\u0027s the wrong side of irqentry_enter(), and\n\u0027index\u0027 is put into %ebp across the function call.\n\nRemove the index variable and reposition array_index_nospec(), so it\u0027s\ncalculated immediately before the array access."
}
],
"providerMetadata": {
"dateUpdated": "2026-04-13T06:05:39.073Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/3bc5887b0a2b06d2d9c22f1f4f8500490b3ae643"
},
{
"url": "https://git.kernel.org/stable/c/e58f1a9b0677de24dcfee0b21393446ec92ff120"
},
{
"url": "https://git.kernel.org/stable/c/92caa5274b99cb6729177232a029ce0dfa6c5f7b"
},
{
"url": "https://git.kernel.org/stable/c/aa280a08e7d8fae58557acc345b36b3dc329d595"
}
],
"title": "x86/fred: Correct speculative safety in fred_extint()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-23354",
"datePublished": "2026-03-25T10:27:38.825Z",
"dateReserved": "2026-01-13T15:37:46.000Z",
"dateUpdated": "2026-04-13T06:05:39.073Z",
"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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