fkie_cve-2024-45020
Vulnerability from fkie_nvd
Published
2024-09-11 16:15
Modified
2024-09-13 16:36
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
bpf: Fix a kernel verifier crash in stacksafe()
Daniel Hodges reported a kernel verifier crash when playing with sched-ext.
Further investigation shows that the crash is due to invalid memory access
in stacksafe(). More specifically, it is the following code:
if (exact != NOT_EXACT &&
old->stack[spi].slot_type[i % BPF_REG_SIZE] !=
cur->stack[spi].slot_type[i % BPF_REG_SIZE])
return false;
The 'i' iterates old->allocated_stack.
If cur->allocated_stack < old->allocated_stack the out-of-bound
access will happen.
To fix the issue add 'i >= cur->allocated_stack' check such that if
the condition is true, stacksafe() should fail. Otherwise,
cur->stack[spi].slot_type[i % BPF_REG_SIZE] memory access is legal.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | 6.11 | |
| linux | linux_kernel | 6.11 | |
| linux | linux_kernel | 6.11 |
{
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"versionEndExcluding": "6.6.48",
"versionStartIncluding": "6.6.15",
"vulnerable": true
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"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix a kernel verifier crash in stacksafe()\n\nDaniel Hodges reported a kernel verifier crash when playing with sched-ext.\nFurther investigation shows that the crash is due to invalid memory access\nin stacksafe(). More specifically, it is the following code:\n\n if (exact != NOT_EXACT \u0026\u0026\n old-\u003estack[spi].slot_type[i % BPF_REG_SIZE] !=\n cur-\u003estack[spi].slot_type[i % BPF_REG_SIZE])\n return false;\n\nThe \u0027i\u0027 iterates old-\u003eallocated_stack.\nIf cur-\u003eallocated_stack \u003c old-\u003eallocated_stack the out-of-bound\naccess will happen.\n\nTo fix the issue add \u0027i \u003e= cur-\u003eallocated_stack\u0027 check such that if\nthe condition is true, stacksafe() should fail. Otherwise,\ncur-\u003estack[spi].slot_type[i % BPF_REG_SIZE] memory access is legal."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf: Se corrige un fallo del verificador del kernel en stacksafe() Daniel Hodges inform\u00f3 de un fallo del verificador del kernel al jugar con sched-ext. Una investigaci\u00f3n m\u00e1s profunda muestra que el fallo se debe a un acceso a memoria no v\u00e1lido en stacksafe(). M\u00e1s espec\u00edficamente, es el siguiente c\u00f3digo: if (exact != NOT_EXACT \u0026amp;\u0026amp; old-\u0026gt;stack[spi].slot_type[i % BPF_REG_SIZE] != cur-\u0026gt;stack[spi].slot_type[i % BPF_REG_SIZE]) return false; La \u0027i\u0027 itera old-\u0026gt;allocated_stack. Si cur-\u0026gt;allocated_stack \u0026lt; old-\u0026gt;allocated_stack, se producir\u00e1 el acceso fuera de l\u00edmites. Para solucionar el problema, agregue la comprobaci\u00f3n \u0027i \u0026gt;= cur-\u0026gt;allocated_stack\u0027 de modo que, si la condici\u00f3n es verdadera, stacksafe() deber\u00eda fallar. De lo contrario, el acceso a la memoria cur-\u0026gt;stack[spi].slot_type[i % BPF_REG_SIZE] es legal."
}
],
"id": "CVE-2024-45020",
"lastModified": "2024-09-13T16:36:52.290",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2024-09-11T16:15:07.050",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/6e3987ac310c74bb4dd6a2fa8e46702fe505fb2b"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
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"url": "https://git.kernel.org/stable/c/7cad3174cc79519bf5f6c4441780264416822c08"
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Analyzed",
"weaknesses": [
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"description": [
{
"lang": "en",
"value": "CWE-787"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
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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.
- 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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