CVE-2024-57898: wifi: cfg80211: clear link ID from bitmap during link delete after clean up
Description
In the Linux kernel, the following vulnerability has been resolved:
wifi: cfg80211: clear link ID from bitmap during link delete after clean up
Currently, during link deletion, the link ID is first removed from the
valid_links bitmap before performing any clean-up operations. However, some
functions require the link ID to remain in the valid_links bitmap. One
such example is cfg80211_cac_event(). The flow is -
nl80211_remove_link()
cfg80211_remove_link()
ieee80211_del_intf_link()
ieee80211_vif_set_links()
ieee80211_vif_update_links()
ieee80211_link_stop()
cfg80211_cac_event()
cfg80211_cac_event() requires link ID to be present but it is cleared
already in cfg80211_remove_link(). Ultimately, WARN_ON() is hit.
Therefore, clear the link ID from the bitmap only after completing the link
clean-up.
Classification
CVE ID: CVE-2024-57898
Affected Products
Vendor: Linux
Product: Linux
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.04% (probability of being exploited)
EPSS Percentile: 11.5% (scored less or equal to compared to others)
EPSS Date: 2025-02-13 (when was this score calculated)
References
https://git.kernel.org/stable/c/ae07daf440d3220d0986e676317a5da66e4f9dfdhttps://git.kernel.org/stable/c/b5c32ff6a3a38c74facdd1fe34c0d709a55527fd