Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: flowtable: publish HW_DEAD after worker is done flow_offload_work_del() sets NF_FLOW_HW_DEAD before the work handler clears NF_FLOW_HW_PENDING. Once a flow is both HW_DYING and HW_DEAD, a concurrent garbage collection pass can remove it and schedule it for RCU freeing. The offload worker holds neither an RCU read lock nor a reference to the flow. If it is preempted after publishing HW_DEAD, the RCU callback can free the flow before the worker resumes and clears HW_PENDING, resulting in a use-after-free. Move HW_DEAD publication to the common worker epilogue after the pending bit is cleared, making it the final flow access by destroy work. Order all preceding flow accesses before publishing the bit that allows garbage collection to free the object.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
2c8897953f3b2ff5498f3f275708a742bfcdbc24 to < f92e8f39726ba68a7c42c6b7566be687c8161579affected2c8897953f3b2ff5498f3f275708a742bfcdbc24 to < 00e452a7ca9fda135ea3d04a11128d5088e354a8affected2c8897953f3b2ff5498f3f275708a742bfcdbc24 to < 56f39c7d139bb76072efe2fb3dcafc13ba915ad8affected2c8897953f3b2ff5498f3f275708a742bfcdbc24 to < e20701843032c438f879066a77ea85e361c6b999affected2c8897953f3b2ff5498f3f275708a742bfcdbc24 to < b4f0f05dfbe836a171bff261f17d098a4d5461eaaffected2c8897953f3b2ff5498f3f275708a742bfcdbc24 to < b0ef9450e93f2adeb77593db14c2ac7c6c8f5060affected2c8897953f3b2ff5498f3f275708a742bfcdbc24 to < f26652e99f519e6bd34f8a9b48fbb33c603585f2affected2c8897953f3b2ff5498f3f275708a742bfcdbc24 to < d644b23afe1ef509c9961a6d84a093c2587edf02affected
Linux Linux
Default version status: affected
5.7affected0 to < 5.7unaffected5.10.271 to ≤ 5.10.*unaffected5.15.222 to ≤ 5.15.*unaffected6.1.189 to ≤ 6.1.*unaffected6.6.158 to ≤ 6.6.*unaffected6.12.112 to ≤ 6.12.*unaffected6.18.55 to ≤ 6.18.*unaffected7.2.9 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/f92e8f39726ba68a7c42c6b7566be687c8161579 ↗
- https://git.kernel.org/stable/c/00e452a7ca9fda135ea3d04a11128d5088e354a8 ↗
- https://git.kernel.org/stable/c/56f39c7d139bb76072efe2fb3dcafc13ba915ad8 ↗
- https://git.kernel.org/stable/c/e20701843032c438f879066a77ea85e361c6b999 ↗
- https://git.kernel.org/stable/c/b4f0f05dfbe836a171bff261f17d098a4d5461ea ↗
- https://git.kernel.org/stable/c/b0ef9450e93f2adeb77593db14c2ac7c6c8f5060 ↗
- https://git.kernel.org/stable/c/f26652e99f519e6bd34f8a9b48fbb33c603585f2 ↗
- https://git.kernel.org/stable/c/d644b23afe1ef509c9961a6d84a093c2587edf02 ↗