High · published February 26, 2025
In the Linux kernel, the following vulnerability has been resolved:
wifi: mac80211: fix use-after-free in chanctx code
In ieee80211_vif_use_reserved_context(), when we have an
old context and the new context's replace_state is set to
IEEE80211_CHANCTX_REPLACE_NONE, we free the old context
in ieee80211_vif_use_reserved_reassign(). Therefore, we
cannot check the old_ctx anymore, so we should set it to
NULL after this point.
However, since the new_ctx replace state is clearly not
IEEE80211_CHANCTX_REPLACES_OTHER, we're not going to do
anything else in this function and can just return to
avoid accessing the freed old_ctx.
| Product | Versions | Fixed in |
|---|---|---|
| linux/linux_kernel | ≥ 3.17, < 4.9.318 | 4.9.318 |
| linux/linux_kernel | ≥ 4.10, < 4.14.283 | 4.14.283 |
| linux/linux_kernel | ≥ 4.15, < 4.19.247 | 4.19.247 |
| linux/linux_kernel | ≥ 4.20, < 5.4.198 | 5.4.198 |
| linux/linux_kernel | ≥ 5.5, < 5.10.121 | 5.10.121 |
| linux/linux_kernel | ≥ 5.11, < 5.15.46 | 5.15.46 |
| linux/linux_kernel | ≥ 5.16, < 5.17.14 | 5.17.14 |
| linux/linux_kernel | ≥ 5.18, < 5.18.3 | 5.18.3 |