FKIE_CVE-2026-46259
Vulnerability from fkie_nvd - Published: 2026-06-03 18:16 - Updated: 2026-07-22 20:10
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved:
procfs: fix missing RCU protection when reading real_parent in do_task_stat()
When reading /proc/[pid]/stat, do_task_stat() accesses task->real_parent
without proper RCU protection, which leads to:
cpu 0 cpu 1
----- -----
do_task_stat
var = task->real_parent
release_task
call_rcu(delayed_put_task_struct)
task_tgid_nr_ns(var)
rcu_read_lock <--- Too late to protect task->real_parent!
task_pid_ptr <--- UAF!
rcu_read_unlock
This patch uses task_ppid_nr_ns() instead of task_tgid_nr_ns() to add
proper RCU protection for accessing task->real_parent.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * |
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"fs/proc/array.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "fefa0fcd78be465b7ad4c497fa6ec90d64194c04",
"status": "affected",
"version": "06fffb1267c9d986687b69d74a46ee332a50575e",
"versionType": "git"
},
{
"lessThan": "c93a33f28f915d446eea6fb3f0e1def0b3af1982",
"status": "affected",
"version": "06fffb1267c9d986687b69d74a46ee332a50575e",
"versionType": "git"
},
{
"lessThan": "1c8dc5b5517546c68ffae40b948336122bb61306",
"status": "affected",
"version": "06fffb1267c9d986687b69d74a46ee332a50575e",
"versionType": "git"
},
{
"lessThan": "0e64bd46a04a4fd61279aca9f53a664e9e5f7e7e",
"status": "affected",
"version": "06fffb1267c9d986687b69d74a46ee332a50575e",
"versionType": "git"
},
{
"lessThan": "73ec7c96601d61d52310c659145bb06d933a0fa6",
"status": "affected",
"version": "06fffb1267c9d986687b69d74a46ee332a50575e",
"versionType": "git"
},
{
"lessThan": "4f9ae386861e280b7631ca252f798d25575627ee",
"status": "affected",
"version": "06fffb1267c9d986687b69d74a46ee332a50575e",
"versionType": "git"
},
{
"lessThan": "dd8b13cb4ff1a4545a214ed897fdf2bc341155b6",
"status": "affected",
"version": "06fffb1267c9d986687b69d74a46ee332a50575e",
"versionType": "git"
},
{
"lessThan": "76149d53502cf17ef3ae454ff384551236fba867",
"status": "affected",
"version": "06fffb1267c9d986687b69d74a46ee332a50575e",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"fs/proc/array.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.26"
},
{
"lessThan": "2.6.26",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.252",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.202",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.165",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.128",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.75",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.14",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"version": "6.19.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "CEFA4799-47FB-4FB8-B0BD-07264C560EC8",
"versionEndExcluding": "5.10.252",
"versionStartIncluding": "2.6.26",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "4002FC2B-1456-4666-B240-0EBF590C4671",
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"versionStartIncluding": "5.11",
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "6.1.165",
"versionStartIncluding": "5.16",
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "851E9353-6C09-4CC9-877E-E09DB164A3C2",
"versionEndExcluding": "6.6.128",
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},
{
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{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nprocfs: fix missing RCU protection when reading real_parent in do_task_stat()\n\nWhen reading /proc/[pid]/stat, do_task_stat() accesses task-\u003ereal_parent\nwithout proper RCU protection, which leads to:\n\n cpu 0 cpu 1\n ----- -----\n do_task_stat\n var = task-\u003ereal_parent\n release_task\n call_rcu(delayed_put_task_struct)\n task_tgid_nr_ns(var)\n rcu_read_lock \u003c--- Too late to protect task-\u003ereal_parent!\n task_pid_ptr \u003c--- UAF!\n rcu_read_unlock\n\nThis patch uses task_ppid_nr_ns() instead of task_tgid_nr_ns() to add\nproper RCU protection for accessing task-\u003ereal_parent."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nprocfs: corrige la falta de protecci\u00f3n RCU al leer real_parent en do_task_stat()\n\nAl leer /proc/[pid]/stat, do_task_stat() accede a task-\u003ereal_parent sin la protecci\u00f3n RCU adecuada, lo que lleva a:\n\n cpu 0 cpu 1\n ----- -----\n do_task_stat\n var = task-\u003ereal_parent\n release_task\n call_rcu(delayed_put_task_struct)\n task_tgid_nr_ns(var)\n rcu_read_lock \u003c--- \u00a1Demasiado tarde para proteger task-\u003ereal_parent!\n task_pid_ptr \u003c--- \u00a1UAF!\n rcu_read_unlock\n\nEste parche utiliza task_ppid_nr_ns() en lugar de task_tgid_nr_ns() para a\u00f1adir la protecci\u00f3n RCU adecuada para acceder a task-\u003ereal_parent."
}
],
"id": "CVE-2026-46259",
"lastModified": "2026-07-22T20:10:00.127",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2026-06-03T18:16:26.987",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/0e64bd46a04a4fd61279aca9f53a664e9e5f7e7e"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
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],
"url": "https://git.kernel.org/stable/c/1c8dc5b5517546c68ffae40b948336122bb61306"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
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],
"url": "https://git.kernel.org/stable/c/4f9ae386861e280b7631ca252f798d25575627ee"
},
{
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},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
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],
"url": "https://git.kernel.org/stable/c/76149d53502cf17ef3ae454ff384551236fba867"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/c93a33f28f915d446eea6fb3f0e1def0b3af1982"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
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],
"url": "https://git.kernel.org/stable/c/dd8b13cb4ff1a4545a214ed897fdf2bc341155b6"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/fefa0fcd78be465b7ad4c497fa6ec90d64194c04"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "NVD-CWE-noinfo"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
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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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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