CVE-2022-49416
Last modified
CVE-2022-49416 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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.. EPSS estimates a 0.27% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 3.17, < 4.9.318 |
| Linux | Linux Kernel | >= 4.10, < 4.14.283 |
| Linux | Linux Kernel | >= 4.15, < 4.19.247 |
| Linux | Linux Kernel | >= 4.20, < 5.4.198 |
| Linux | Linux Kernel | >= 5.5, < 5.10.121 |
| Linux | Linux Kernel | >= 5.11, < 5.15.46 |
| Linux | Linux Kernel | >= 5.16, < 5.17.14 |
| Linux | Linux Kernel | >= 5.18, < 5.18.3 |
References
Timeline
- Published
- Last Modified
- Status
- Modified
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