Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 74ed7ab9264c54471c7f057409d352052820d750 before bd8ca84d48cd9a4f6fc63df26512c55e1d339927; affected 74ed7ab9264c54471c7f057409d352052820d750 before 00f987f066e802793a37dd2167459e67cf2cf2ec; affected 74ed7ab9264c54471c7f057409d352052820d750 before 696a0b9435fce9cf4f1e9ba7f6afa6bee96c97fc; affected 74ed7ab9264c54471c7f057409d352052820d750 before 87d0c0040b5d4b61de51ae39132c4c46709f2f77; affected 74ed7ab9264c54471c7f057409d352052820d750 before 69f40ccf85074981340847d650a9cbf9adabfbbe; affected 74ed7ab9264c54471c7f057409d352052820d750 before 23716dd9d8d46a5908536b73dc085e62f2b5c237; affected 74ed7ab9264c54471c7f057409d352052820d750 before 20751193d83be2e9735d4faee71375691c09cd13; affected 74ed7ab9264c54471c7f057409d352052820d750 before 5d1c224dd914579524a183a514c12b95095d12ce |
| Linux / Linux | affected 4.0; unaffected 0 before 4.0; unaffected 5.10.265 through 5.10.*; unaffected 5.15.216 through 5.15.*; unaffected 6.1.183 through 6.1.*; unaffected 6.6.152 through 6.6.*; unaffected 6.12.104 through 6.12.*; unaffected 6.18.45 through 6.18.*; unaffected 7.1.9 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
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