Answer in brief
CVE-2026-74664 records a Unknown severity vulnerability in net: openvswitch: reallocate update replies for mismatched IDs. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=74ed7ab9264c54471c7f057409d352052820d750 <bd8ca84d48cd9a4f6fc63df26512c55e1d339927 || >=74ed7ab9264c54471c7f057409d352052820d750 <00f987f066e802793a37dd2167459e67cf2cf2ec || >=74ed7ab9264c54471c7f057409d352052820d750 <696a0b9435fce9cf4f1e9ba7f6afa6bee96c97fc || >=74ed7ab9264c54471c7f057409d352052820d750 <87d0c0040b5d4b61de51ae39132c4c46709f2f77 || >=74ed7ab9264c54471c7f057409d352052820d750 <69f40ccf85074981340847d650a9cbf9adabfbbe || >=74ed7ab9264c54471c7f057409d352052820d750 <23716dd9d8d46a5908536b73dc085e62f2b5c237 || >=74ed7ab9264c54471c7f057409d352052820d750 <20751193d83be2e9735d4faee71375691c09cd13 || >=74ed7ab9264c54471c7f057409d352052820d750 <5d1c224dd914579524a183a514c12b95095d12ce | bd8ca84d48cd9a4f6fc63df26512c55e1d339927, 00f987f066e802793a37dd2167459e67cf2cf2ec, 696a0b9435fce9cf4f1e9ba7f6afa6bee96c97fc, 87d0c0040b5d4b61de51ae39132c4c46709f2f77, 69f40ccf85074981340847d650a9cbf9adabfbbe, 23716dd9d8d46a5908536b73dc085e62f2b5c237, 20751193d83be2e9735d4faee71375691c09cd13, 5d1c224dd914579524a183a514c12b95095d12ce |
| Linux/Linuxgeneric | 4.0 | Not reported |
Published upstream
Aug 22, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 22, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 22, 2026
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.
Quoted source text, attributed separately from HOL analysis.