CVE-2024-27005

Summary

In the Linux kernel, the following vulnerability has been resolved:

interconnect: Don't access req_list while it's being manipulated

The icc_lock mutex was split into separate icc_lock and icc_bw_lock mutexes in [1] to avoid lockdep splats. However, this didn't adequately protect access to icc_node::req_list.

The icc_set_bw() function will eventually iterate over req_list while only holding icc_bw_lock, but req_list can be modified while only holding icc_lock. This causes races between icc_set_bw(), of_icc_get(), and icc_put().

Example A:

CPU0 CPU1

icc_set_bw(path_a) mutex_lock(&icc_bw_lock); icc_put(path_b) mutex_lock(&icc_lock); aggregate_requests() hlist_for_each_entry(r, … hlist_del(… <r = invalid pointer>

Example B:

CPU0 CPU1

icc_set_bw(path_a) mutex_lock(&icc_bw_lock); path_b = of_icc_get() of_icc_get_by_index() mutex_lock(&icc_lock); path_find() path_init() aggregate_requests() hlist_for_each_entry(r, … hlist_add_head(… <r = invalid pointer>

Fix this by ensuring icc_bw_lock is always held before manipulating icc_node::req_list. The additional places icc_bw_lock is held don't perform any memory allocations, so we should still be safe from the original lockdep splats that motivated the separate locks.

[1] commit af42269c3523 ("interconnect: Fix locking for runpm vs reclaim")

Affected Software

VendorProductVersion RangeStatus
LinuxLinux9be2957f014d91088db1eb5dd09d9a03d7184dce < fe549d8e976300d0dd75bd904eb216bed8b145e0affected
LinuxLinuxee42bfc791aa3cd78e29046f26a09d189beb3efb < 19ec82b3cad1abef2a929262b8c1528f4e0c192daffected
LinuxLinuxaf42269c3523492d71ebbe11fefae2653e9cdc78 < d0d04efa2e367921654b5106cc5c05e3757c2b42affected
LinuxLinuxaf42269c3523492d71ebbe11fefae2653e9cdc78 < 4c65507121ea8e0b47fae6d2049c8688390d46b6affected
LinuxLinuxaf42269c3523492d71ebbe11fefae2653e9cdc78 < de1bf25b6d771abdb52d43546cf57ad775fb68a1affected
LinuxLinux2f3a124696d43de3c837f87a9f767c56ee86cf2aaffected
LinuxLinux5.15.133 < 5.15.151affected
LinuxLinux6.1.55 < 6.1.81affected
LinuxLinux6.5.5 < 6.6affected
LinuxLinux6.6affected
LinuxLinux0 < 6.6unaffected
LinuxLinux5.15.151 <= 5.15.*unaffected
LinuxLinux6.1.81 <= 6.1.*unaffected
LinuxLinux6.6.29 <= 6.6.*unaffected
LinuxLinux6.8.8 <= 6.8.*unaffected
LinuxLinux6.9 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

References