fkie_cve-2024-50036
Vulnerability from fkie_nvd
Published
2024-10-21 20:15
Modified
2024-11-17 15:15
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
net: do not delay dst_entries_add() in dst_release()
dst_entries_add() uses per-cpu data that might be freed at netns
dismantle from ip6_route_net_exit() calling dst_entries_destroy()
Before ip6_route_net_exit() can be called, we release all
the dsts associated with this netns, via calls to dst_release(),
which waits an rcu grace period before calling dst_destroy()
dst_entries_add() use in dst_destroy() is racy, because
dst_entries_destroy() could have been called already.
Decrementing the number of dsts must happen sooner.
Notes:
1) in CONFIG_XFRM case, dst_destroy() can call
dst_release_immediate(child), this might also cause UAF
if the child does not have DST_NOCOUNT set.
IPSEC maintainers might take a look and see how to address this.
2) There is also discussion about removing this count of dst,
which might happen in future kernels.
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 | 6.12 | |
| linux | linux_kernel | 6.12 |
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"descriptions": [
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"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: do not delay dst_entries_add() in dst_release()\n\ndst_entries_add() uses per-cpu data that might be freed at netns\ndismantle from ip6_route_net_exit() calling dst_entries_destroy()\n\nBefore ip6_route_net_exit() can be called, we release all\nthe dsts associated with this netns, via calls to dst_release(),\nwhich waits an rcu grace period before calling dst_destroy()\n\ndst_entries_add() use in dst_destroy() is racy, because\ndst_entries_destroy() could have been called already.\n\nDecrementing the number of dsts must happen sooner.\n\nNotes:\n\n1) in CONFIG_XFRM case, dst_destroy() can call\n dst_release_immediate(child), this might also cause UAF\n if the child does not have DST_NOCOUNT set.\n IPSEC maintainers might take a look and see how to address this.\n\n2) There is also discussion about removing this count of dst,\n which might happen in future kernels."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: no retrasar dst_entries_add() en dst_release() dst_entries_add() usa datos por CPU que podr\u00edan liberarse en el desmantelamiento de netns de ip6_route_net_exit() llamando a dst_entries_destroy() Antes de que se pueda llamar a ip6_route_net_exit(), liberamos todos los dst asociados con este netns, a trav\u00e9s de llamadas a dst_release(), que espera un per\u00edodo de gracia de rcu antes de llamar a dst_destroy() El uso de dst_entries_add() en dst_destroy() es arriesgado, porque dst_entries_destroy() ya podr\u00eda haberse llamado. La disminuci\u00f3n del n\u00famero de dst debe ocurrir antes. Notas: 1) en el caso de CONFIG_XFRM, dst_destroy() puede llamar a dst_release_immediate(child), lo que tambi\u00e9n podr\u00eda causar UAF si el hijo no tiene DST_NOCOUNT configurado. Los encargados del mantenimiento de IPSEC podr\u00edan echar un vistazo y ver c\u00f3mo solucionar esto. 2) Tambi\u00e9n se est\u00e1 discutiendo sobre la eliminaci\u00f3n de este recuento de dst, lo que podr\u00eda suceder en kernels futuros."
}
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"id": "CVE-2024-50036",
"lastModified": "2024-11-17T15:15:18.893",
"metrics": {
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"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.0,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
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"exploitabilityScore": 1.0,
"impactScore": 5.9,
"source": "nvd@nist.gov",
"type": "Primary"
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"published": "2024-10-21T20:15:16.717",
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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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