CVE-2022-49479

Summary

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

mt76: fix tx status related use-after-free race on station removal

There is a small race window where ongoing tx activity can lead to a skb getting added to the status tracking idr after that idr has already been cleaned up, which will keep the wcid linked in the status poll list. Fix this by only adding status skbs if the wcid pointer is still assigned in dev->wcid, which gets cleared early by mt76_sta_pre_rcu_remove

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxbd1e3e7b693c17a04e7d2bd9119daa482b7c7720 < ef7f9f894cfd0b2e471206409a529af4a26ddd55affected
LinuxLinuxbd1e3e7b693c17a04e7d2bd9119daa482b7c7720 < ddd426d72aca4054045a9bd3b80a4ce1d398f11faffected
LinuxLinuxbd1e3e7b693c17a04e7d2bd9119daa482b7c7720 < fcfe1b5e162bf473c1d47760962cec8523c00466affected
LinuxLinux5.16affected
LinuxLinux0 < 5.16unaffected
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