CVE-2024-26586
mlxsw: spectrum_acl_tcam: Fix stack corruption
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 stack corruption
When tc filters are first added to a net device, the corresponding local
port gets bound to an ACL group in the device. The group contains a list
of ACLs. In turn, each ACL points to a different TCAM region where the
filters are stored. During forwarding, the ACLs are sequentially
evaluated until a match is found.
One reason to place filters in different regions is when they are added
with decreasing priorities and in an alternating order so that two
consecutive filters can never fit in the same region because of their
key usage.
In Spectrum-2 and newer ASICs the firmware started to report that the
maximum number of ACLs in a group is more than 16, but the layout of the
register that configures ACL groups (PAGT) was not updated to account
for that. It is therefore possible to hit stack corruption [1] in the
rare case where more than 16 ACLs in a group are required.
Fix by limiting the maximum ACL group size to the minimum between what
the firmware reports and the maximum ACLs that fit in the PAGT register.
Add a test case to make sure the machine does not crash when this
condition is hit.
[1]
Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: mlxsw_sp_acl_tcam_group_update+0x116/0x120
[...]
dump_stack_lvl+0x36/0x50
panic+0x305/0x330
__stack_chk_fail+0x15/0x20
mlxsw_sp_acl_tcam_group_update+0x116/0x120
mlxsw_sp_acl_tcam_group_region_attach+0x69/0x110
mlxsw_sp_acl_tcam_vchunk_get+0x492/0xa20
mlxsw_sp_acl_tcam_ventry_add+0x25/0xe0
mlxsw_sp_acl_rule_add+0x47/0x240
mlxsw_sp_flower_replace+0x1a9/0x1d0
tc_setup_cb_add+0xdc/0x1c0
fl_hw_replace_filter+0x146/0x1f0
fl_change+0xc17/0x1360
tc_new_tfilter+0x472/0xb90
rtnetlink_rcv_msg+0x313/0x3b0
netlink_rcv_skb+0x58/0x100
netlink_unicast+0x244/0x390
netlink_sendmsg+0x1e4/0x440
____sys_sendmsg+0x164/0x260
___sys_sendmsg+0x9a/0xe0
__sys_sendmsg+0x7a/0xc0
do_syscall_64+0x40/0xe0
entry_SYSCALL_64_after_hwframe+0x63/0x6b
En el kernel de Linux, se resolvió la siguiente vulnerabilidad: mlxsw: espectro_acl_tcam: corrige la corrupción de la pila Cuando los filtros tc se agregan por primera vez a un dispositivo de red, el puerto local correspondiente se vincula a un grupo ACL en el dispositivo. El grupo contiene una lista de ACL. A su vez, cada ACL apunta a una región TCAM diferente donde se almacenan los filtros. Durante el reenvío, las ACL se evalúan secuencialmente hasta que se encuentra una coincidencia. Una razón para colocar filtros en diferentes regiones es cuando se agregan con prioridades decrecientes y en orden alterno, de modo que dos filtros consecutivos nunca puedan caber en la misma región debido a su uso clave. En Spectrum-2 y ASIC más nuevos, el firmware comenzó a informar que la cantidad máxima de ACL en un grupo es superior a 16, pero el diseño del registro que configura los grupos de ACL (PAGT) no se actualizó para tener en cuenta eso. Por lo tanto, es posible sufrir daños en la pila [1] en el raro caso de que se requieran más de 16 ACL en un grupo. Se soluciona limitando el tamaño máximo del grupo de ACL al mínimo entre lo que informa el firmware y las ACL máximas que caben en el registro PAGT. Agregue un caso de prueba para asegurarse de que la máquina no falle cuando se cumpla esta condición. [1] Pánico del kernel - no se sincroniza: stack-protector: La pila del kernel está dañada en: mlxsw_sp_acl_tcam_group_update+0x116/0x120 [...] dump_stack_lvl+0x36/0x50 pánico+0x305/0x330 __stack_chk_fail+0x15/0x20 mlxsw_sp_acl_tcam_group_update+ 0x116/0x120 mlxsw_sp_acl_tcam_group_region_attach +0x69/0x110 mlxsw_sp_acl_tcam_vchunk_get+0x492/0xa20 mlxsw_sp_acl_tcam_ventry_add+0x25/0xe0 mlxsw_sp_acl_rule_add+0x47/0x240 mlxsw_sp_flower_replace+0x1a9/0x1d0 tc_setup_cb _add+0xdc/0x1c0 fl_hw_replace_filter+0x146/0x1f0 fl_change+0xc17/0x1360 tc_new_tfilter+0x472/0xb90 rtnetlink_rcv_msg+0x313/0x3b0 netlink_rcv_skb +0x58/0x100 netlink_unicast+0x244/0x390 netlink_sendmsg+0x1e4/0x440 ____sys_sendmsg+0x164/0x260 ___sys_sendmsg+0x9a/0xe0 __sys_sendmsg+0x7a/0xc0 do_syscall_64+0x 40/0xe0 entrada_SYSCALL_64_after_hwframe+0x63/0x6b
A kernel stack flaw that corrupted the Linux kernel’s Mellanox Technologies Spectrum Ethernet driver was found when a user initialized more than 16 access control lists (ACLs). This flaw allows a local user to crash or potentially escalate their privileges on the system.
CVSS Scores
SSVC
- Decision:Track
Timeline
- 2024-02-19 CVE Reserved
- 2024-02-22 CVE Published
- 2024-03-19 EPSS Updated
- 2024-08-02 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-787: Out-of-bounds Write
CAPEC
References (10)
| URL | Tag | Source |
|---|---|---|
| https://git.kernel.org/stable/c/c3ab435466d5109b2c7525a3b90107d4d9e918fc | Vuln. Introduced | |
| https://lists.debian.org/debian-lts-announce/2024/06/msg00016.html |
|
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2024-26586 | 2024-08-08 | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2265645 | 2024-08-08 |
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" | >= 4.19 < 5.10.209 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.19 < 5.10.209" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.19 < 5.15.148 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.19 < 5.15.148" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.19 < 6.1.79 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.19 < 6.1.79" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.19 < 6.6.14 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.19 < 6.6.14" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.19 < 6.7.2 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.19 < 6.7.2" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.19 < 6.8 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.19 < 6.8" | en |
Affected
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