fkie_cve-2022-49085
Vulnerability from fkie_nvd
Published
2025-02-26 07:00
Modified
2025-03-25 16:21
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
drbd: Fix five use after free bugs in get_initial_state
In get_initial_state, it calls notify_initial_state_done(skb,..) if
cb->args[5]==1. If genlmsg_put() failed in notify_initial_state_done(),
the skb will be freed by nlmsg_free(skb).
Then get_initial_state will goto out and the freed skb will be used by
return value skb->len, which is a uaf bug.
What's worse, the same problem goes even further: skb can also be
freed in the notify_*_state_change -> notify_*_state calls below.
Thus 4 additional uaf bugs happened.
My patch lets the problem callee functions: notify_initial_state_done
and notify_*_state_change return an error code if errors happen.
So that the error codes could be propagated and the uaf bugs can be avoid.
v2 reports a compilation warning. This v3 fixed this warning and built
successfully in my local environment with no additional warnings.
v2: https://lore.kernel.org/patchwork/patch/1435218/
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 | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | 5.18 |
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrbd: Fix five use after free bugs in get_initial_state\n\nIn get_initial_state, it calls notify_initial_state_done(skb,..) if\ncb-\u003eargs[5]==1. If genlmsg_put() failed in notify_initial_state_done(),\nthe skb will be freed by nlmsg_free(skb).\nThen get_initial_state will goto out and the freed skb will be used by\nreturn value skb-\u003elen, which is a uaf bug.\n\nWhat\u0027s worse, the same problem goes even further: skb can also be\nfreed in the notify_*_state_change -\u003e notify_*_state calls below.\nThus 4 additional uaf bugs happened.\n\nMy patch lets the problem callee functions: notify_initial_state_done\nand notify_*_state_change return an error code if errors happen.\nSo that the error codes could be propagated and the uaf bugs can be avoid.\n\nv2 reports a compilation warning. This v3 fixed this warning and built\nsuccessfully in my local environment with no additional warnings.\nv2: https://lore.kernel.org/patchwork/patch/1435218/"
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drbd: Arregla cinco errores de use-after-free en get_initial_state En get_initial_state, llama a notify_initial_state_done(skb,..) si cb-\u0026gt;args[5]==1. Si genlmsg_put() fall\u00f3 en notify_initial_state_done(), el skb ser\u00e1 liberado por nlmsg_free(skb). Entonces get_initial_state saldr\u00e1 y el skb liberado ser\u00e1 utilizado por el valor de retorno skb-\u0026gt;len, que es un error de uaf. Lo que es peor, el mismo problema va a\u00fan m\u00e1s all\u00e1: skb tambi\u00e9n se puede liberar en las llamadas notify_*_state_change -\u0026gt; notify_*_state a continuaci\u00f3n. Por lo tanto, ocurrieron 4 errores de uaf adicionales. Mi parche permite que las funciones llamadas al problema: notify_initial_state_done y notify_*_state_change devuelvan un c\u00f3digo de error si ocurren errores. Para que los c\u00f3digos de error se puedan propagar y los errores de uaf se puedan evitar, la v2 informa una advertencia de compilaci\u00f3n. Esta v3 corrigi\u00f3 esta advertencia y se compil\u00f3 correctamente en mi entorno local sin advertencias adicionales. v2: https://lore.kernel.org/patchwork/patch/1435218/"
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"id": "CVE-2022-49085",
"lastModified": "2025-03-25T16:21:29.173",
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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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