Description
In the Linux kernel, the following vulnerability has been resolved: net: openvswitch: reallocate update replies for mismatched IDs ovs_flow_cmd_new() preallocates the optional reply skb before it takes ovs_mutex and before it knows which existing flow will be updated. That is normally fine because the skb is sized from the request flow identifier. That identifier also becomes the inserted flow's identifier. For updates, however, a request with a UFID may miss the UFID lookup and then fall back to the flow key lookup. That lookup can legitimately find an existing key-identified flow. UFIDs are optional and the flow key is the primary identifier. For echoed replies, ovs_flow_cmd_fill_info() writes the matched flow's identifier, not the request identifier used for the preallocation. A short request UFID can therefore leave too little room for the key identifier. The fill can then fail with -EMSGSIZE and hit the BUG_ON(error < 0) in the update path. Once the update target has been resolved, reallocate the reply skb if the matched flow needs a larger reply than the request identifier allowed. Do this before replacing the actions so the request can still fail cleanly if the rare extra allocation fails.
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
74ed7ab9264c54471c7f057409d352052820d750 to < bd8ca84d48cd9a4f6fc63df26512c55e1d339927affected74ed7ab9264c54471c7f057409d352052820d750 to < 00f987f066e802793a37dd2167459e67cf2cf2ecaffected74ed7ab9264c54471c7f057409d352052820d750 to < 696a0b9435fce9cf4f1e9ba7f6afa6bee96c97fcaffected74ed7ab9264c54471c7f057409d352052820d750 to < 87d0c0040b5d4b61de51ae39132c4c46709f2f77affected74ed7ab9264c54471c7f057409d352052820d750 to < 69f40ccf85074981340847d650a9cbf9adabfbbeaffected74ed7ab9264c54471c7f057409d352052820d750 to < 23716dd9d8d46a5908536b73dc085e62f2b5c237affected74ed7ab9264c54471c7f057409d352052820d750 to < 20751193d83be2e9735d4faee71375691c09cd13affected74ed7ab9264c54471c7f057409d352052820d750 to < 5d1c224dd914579524a183a514c12b95095d12ceaffected
Linux Linux
Default version status: affected
4.0affected0 to < 4.0unaffected5.10.265 to ≤ 5.10.*unaffected5.15.216 to ≤ 5.15.*unaffected6.1.183 to ≤ 6.1.*unaffected6.6.152 to ≤ 6.6.*unaffected6.12.104 to ≤ 6.12.*unaffected6.18.45 to ≤ 6.18.*unaffected7.1.9 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/bd8ca84d48cd9a4f6fc63df26512c55e1d339927 ↗
- https://git.kernel.org/stable/c/00f987f066e802793a37dd2167459e67cf2cf2ec ↗
- https://git.kernel.org/stable/c/696a0b9435fce9cf4f1e9ba7f6afa6bee96c97fc ↗
- https://git.kernel.org/stable/c/87d0c0040b5d4b61de51ae39132c4c46709f2f77 ↗
- https://git.kernel.org/stable/c/69f40ccf85074981340847d650a9cbf9adabfbbe ↗
- https://git.kernel.org/stable/c/23716dd9d8d46a5908536b73dc085e62f2b5c237 ↗
- https://git.kernel.org/stable/c/20751193d83be2e9735d4faee71375691c09cd13 ↗
- https://git.kernel.org/stable/c/5d1c224dd914579524a183a514c12b95095d12ce ↗