CVE-2022-49968

Summary

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

ieee802154/adf7242: defer destroy_workqueue call

There is a possible race condition (use-after-free) like below

(FREE) | (USE) adf7242_remove | adf7242_channel cancel_delayed_work_sync | destroy_workqueue (1) | adf7242_cmd_rx | mod_delayed_work (2) |

The root cause for this race is that the upper layer (ieee802154) is unaware of this detaching event and the function adf7242_channel can be called without any checks.

To fix this, we can add a flag write at the beginning of adf7242_remove and add flag check in adf7242_channel. Or we can just defer the destructive operation like other commit 3e0588c291d6 ("hamradio: defer ax25 kfree after unregister_netdev") which let the ieee802154_unregister_hw() to handle the synchronization. This patch takes the second option.

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Affected Software

VendorProductVersion RangeStatus
LinuxLinux58e9683d14752debc6f22daf6b23e031787df31f < dede80aaf01f4b6e8657d23726cb4a3da226ec4caffected
LinuxLinux58e9683d14752debc6f22daf6b23e031787df31f < bed12d7531df1417fc92c691999ff95e03835008affected
LinuxLinux58e9683d14752debc6f22daf6b23e031787df31f < 23a29932715ca43bceb2eae1bdb770995afe7271affected
LinuxLinux58e9683d14752debc6f22daf6b23e031787df31f < 9f8558c5c642c62c450c98c99b7d18a709fff485affected
LinuxLinux58e9683d14752debc6f22daf6b23e031787df31f < 15f3b89bd521d5770d36a61fc04a77c293138ba6affected
LinuxLinux58e9683d14752debc6f22daf6b23e031787df31f < afe7116f6d3b888778ed6d95e3cf724767b9aedfaffected
LinuxLinuxa2363e2d88bf50022ee643c49ee5d4f7e8c915eaaffected
LinuxLinux4.17.19 < 4.18affected
LinuxLinux4.18affected
LinuxLinux0 < 4.18unaffected
LinuxLinux4.19.258 <= 4.19.*unaffected
LinuxLinux5.4.213 <= 5.4.*unaffected
LinuxLinux5.10.142 <= 5.10.*unaffected
LinuxLinux5.15.66 <= 5.15.*unaffected
LinuxLinux5.19.8 <= 5.19.*unaffected
LinuxLinux6.0 <= *unaffected

Weaknesses

References