CVE-2022-49416

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux5bcae31d9cb1ebfad3ad5a3eea04c8cdc329a04f < 88cc8f963febe192d6ded9df7217f92f380b449aaffected
LinuxLinux5bcae31d9cb1ebfad3ad5a3eea04c8cdc329a04f < 4ba81e794f0fad6234f644c2da1ae14d5b95e1c4affected
LinuxLinux5bcae31d9cb1ebfad3ad5a3eea04c8cdc329a04f < 9f1e5cc85ad77e52f54049a94db0407445ae2a34affected
LinuxLinux5bcae31d9cb1ebfad3ad5a3eea04c8cdc329a04f < 265bec4779a38b65e86a25120370f200822dfa76affected
LinuxLinux5bcae31d9cb1ebfad3ad5a3eea04c8cdc329a04f < 6118bbdf69f4718b02d26bbcf2e497eb66004331affected
LinuxLinux5bcae31d9cb1ebfad3ad5a3eea04c8cdc329a04f < b79110f2bf6022e60e590d2e094728a8eec3e79eaffected
LinuxLinux5bcae31d9cb1ebfad3ad5a3eea04c8cdc329a04f < 82c8e7bbdd06c7ed58e22450cc5b37f33a25bb2caffected
LinuxLinux5bcae31d9cb1ebfad3ad5a3eea04c8cdc329a04f < 4f05a9e15edcdf5b97e0d86ab6ecd5f187289f6caffected
LinuxLinux5bcae31d9cb1ebfad3ad5a3eea04c8cdc329a04f < 2965c4cdf7ad9ce0796fac5e57debb9519ea721eaffected
LinuxLinux3.17affected
LinuxLinux0 < 3.17unaffected
LinuxLinux4.9.318 <= 4.9.*unaffected
LinuxLinux4.14.283 <= 4.14.*unaffected
LinuxLinux4.19.247 <= 4.19.*unaffected
LinuxLinux5.4.198 <= 5.4.*unaffected
LinuxLinux5.10.121 <= 5.10.*unaffected
LinuxLinux5.15.46 <= 5.15.*unaffected
LinuxLinux5.17.14 <= 5.17.*unaffected
LinuxLinux5.18.3 <= 5.18.*unaffected
LinuxLinux5.19 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

References