CVE-2024-36007
mlxsw: spectrum_acl_tcam: Fix warning during rehash
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
In the Linux kernel, the following vulnerability has been resolved:
mlxsw: spectrum_acl_tcam: Fix warning during rehash
As previously explained, the rehash delayed work migrates filters from
one region to another. This is done by iterating over all chunks (all
the filters with the same priority) in the region and in each chunk
iterating over all the filters.
When the work runs out of credits it stores the current chunk and entry
as markers in the per-work context so that it would know where to resume
the migration from the next time the work is scheduled.
Upon error, the chunk marker is reset to NULL, but without resetting the
entry markers despite being relative to it. This can result in migration
being resumed from an entry that does not belong to the chunk being
migrated. In turn, this will eventually lead to a chunk being iterated
over as if it is an entry. Because of how the two structures happen to
be defined, this does not lead to KASAN splats, but to warnings such as
[1].
Fix by creating a helper that resets all the markers and call it from
all the places the currently only reset the chunk marker. For good
measures also call it when starting a completely new rehash. Add a
warning to avoid future cases.
[1]
WARNING: CPU: 7 PID: 1076 at drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_keys.c:407 mlxsw_afk_encode+0x242/0x2f0
Modules linked in:
CPU: 7 PID: 1076 Comm: kworker/7:24 Tainted: G W 6.9.0-rc3-custom-00880-g29e61d91b77b #29
Hardware name: Mellanox Technologies Ltd. MSN3700/VMOD0005, BIOS 5.11 01/06/2019
Workqueue: mlxsw_core mlxsw_sp_acl_tcam_vregion_rehash_work
RIP: 0010:mlxsw_afk_encode+0x242/0x2f0
[...]
Call Trace:
<TASK>
mlxsw_sp_acl_atcam_entry_add+0xd9/0x3c0
mlxsw_sp_acl_tcam_entry_create+0x5e/0xa0
mlxsw_sp_acl_tcam_vchunk_migrate_all+0x109/0x290
mlxsw_sp_acl_tcam_vregion_rehash_work+0x6c/0x470
process_one_work+0x151/0x370
worker_thread+0x2cb/0x3e0
kthread+0xd0/0x100
ret_from_fork+0x34/0x50
</TASK>
En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mlxsw: espectro_acl_tcam: Advertencia de corrección durante el rehash Como se explicó anteriormente, el trabajo retrasado del rehash migra filtros de una región a otra. Esto se hace iterando sobre todos los fragmentos (todos los filtros con la misma prioridad) en la región y en cada fragmento iterando sobre todos los filtros. Cuando el trabajo se queda sin créditos, almacena el fragmento y la entrada actuales como marcadores en el contexto por trabajo para saber dónde reanudar la migración la próxima vez que se programe el trabajo. En caso de error, el marcador de fragmento se restablece a NULL, pero sin restablecer los marcadores de entrada a pesar de ser relativos a él. Esto puede provocar que la migración se reanude desde una entrada que no pertenece al fragmento que se está migrando. A su vez, esto eventualmente conducirá a que se repita un fragmento como si fuera una entrada. Debido a cómo se definen las dos estructuras, esto no genera símbolos KASAN, sino advertencias como [1]. Para solucionarlo, cree un asistente que restablezca todos los marcadores y llámelo desde todos los lugares donde actualmente solo restablece el marcador de fragmentos. Por si acaso, llámelo también al iniciar un rehash completamente nuevo. Agregue una advertencia para evitar casos futuros. [1] ADVERTENCIA: CPU: 7 PID: 1076 en drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_keys.c:407 mlxsw_afk_encode+0x242/0x2f0 Módulos vinculados en: CPU: 7 PID: 1076 Comm: kworker/7:24 Tainted : GW 6.9.0-rc3-custom-00880-g29e61d91b77b #29 Nombre del hardware: Mellanox Technologies Ltd. MSN3700/VMOD0005, BIOS 5.11 06/01/2019 Cola de trabajo: mlxsw_core mlxsw_sp_acl_tcam_vregion_rehash_work RIP 0010:mlxsw_af k_encode+0x242/0x2f0 [... ] Seguimiento de llamadas: mlxsw_sp_acl_atcam_entry_add+0xd9/0x3c0 mlxsw_sp_acl_tcam_entry_create+0x5e/0xa0 mlxsw_sp_acl_tcam_vchunk_migrate_all+0x109/0x290 mlxsw_sp_acl_tcam_vregion_rehash_work+0x6 c/0x470 process_one_work+0x151/0x370 worker_thread+0x2cb/0x3e0 kthread+0xd0/0x100 ret_from_fork+0x34/0x50
CVSS Scores
SSVC
- Decision:Track
Timeline
- 2024-05-17 CVE Reserved
- 2024-05-20 CVE Published
- 2024-05-21 EPSS Updated
- 2024-08-02 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
CAPEC
References (11)
| URL | Tag | Source |
|---|---|---|
| https://git.kernel.org/stable/c/6f9579d4e3021b17b0a4cde6b04a6c94c9575cdf | Vuln. Introduced | |
| https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html |
|
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2024-36007 | 2024-07-08 | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2281986 | 2024-07-08 |
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.1 < 5.4.275 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.1 < 5.4.275" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.1 < 5.10.216 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.1 < 5.10.216" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.1 < 5.15.158 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.1 < 5.15.158" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.1 < 6.1.90 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.1 < 6.1.90" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.1 < 6.6.30 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.1 < 6.6.30" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.1 < 6.8.9 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.1 < 6.8.9" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.1 < 6.9 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.1 < 6.9" | en |
Affected
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