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CVE-2026-74664— net: openvswitch: reallocate update replies for mismatched IDs

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 4.0版本存在安全漏洞，该漏洞源于net/openvswitch中的ovs_flow_cmd_new()函数在更新流程中预分配回复skb时未考虑匹配流的标识符长度可能超过请求标识符，导致填充失败并触发BUG_ON，可能导致拒绝服务。

AI Predicted 4.9 Difficulty: Moderate EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 74ed7ab9264c54471c7f057409d352052820d750< bd8ca84d48cd9a4f6fc63df26512c55e1d339927 affected
74ed7ab9264c54471c7f057409d352052820d750< 00f987f066e802793a37dd2167459e67cf2cf2ec affected
74ed7ab9264c54471c7f057409d352052820d750< 696a0b9435fce9cf4f1e9ba7f6afa6bee96c97fc affected
74ed7ab9264c54471c7f057409d352052820d750< 87d0c0040b5d4b61de51ae39132c4c46709f2f77 affected
74ed7ab9264c54471c7f057409d352052820d750< 69f40ccf85074981340847d650a9cbf9adabfbbe affected
74ed7ab9264c54471c7f057409d352052820d750< 23716dd9d8d46a5908536b73dc085e62f2b5c237 affected
74ed7ab9264c54471c7f057409d352052820d750< 20751193d83be2e9735d4faee71375691c09cd13 affected
74ed7ab9264c54471c7f057409d352052820d750< 5d1c224dd914579524a183a514c12b95095d12ce affected
… +10 more rows
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I. Basic Information for CVE-2026-74664

Vulnerability Information
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Vulnerability Title
net: openvswitch: reallocate update replies for mismatched IDs
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 4.0版本存在安全漏洞，该漏洞源于net/openvswitch中的ovs_flow_cmd_new()函数在更新流程中预分配回复skb时未考虑匹配流的标识符长度可能超过请求标识符，导致填充失败并触发BUG_ON，可能导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 74ed7ab9264c54471c7f057409d352052820d750 ~ bd8ca84d48cd9a4f6fc63df26512c55e1d339927 -
Linux Linux 4.0 -

II. Public POCs for CVE-2026-74664

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III. Intelligence Information for CVE-2026-74664

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Patches & Fixes for CVE-2026-74664 (6)

Same Patch Batch · Linux · 2026-08-22 · 149 CVEs total

CVE-2026-74612 10.0 CRITICAL veth: fix skb length accounting after XDP frag adjustment
CVE-2026-74705 10.0 CRITICAL udp: fix potential use-after-free in tunnel segmentation
CVE-2026-74608 9.8 CRITICAL smb: client: Fix use-after-free in cifs_try_adding_channels()
CVE-2026-74628 9.8 CRITICAL net/x25: fix use-after-free of the socket by its timers
CVE-2026-74723 9.8 CRITICAL btrfs: lzo: reject inline extents without valid headers
CVE-2026-74688 9.8 CRITICAL sctp: clear control chunk transport if it is being removed
CVE-2026-74617 9.8 CRITICAL dibs: initialise dibs->lock in dibs_dev_alloc()
CVE-2026-74616 9.8 CRITICAL xdp: reject clones that overrun skb_shared_info tailroom
CVE-2026-74611 9.8 CRITICAL tls: rx: restore msg_iter before TLS 1.3 optimistic retry
CVE-2026-74727 9.8 CRITICAL ovpn: skip rehash for peers already removed from by_id
CVE-2026-74662 9.8 CRITICAL inet: frags: publish queues before arming timer
CVE-2026-74597 9.8 CRITICAL ip6_tunnel: clear skb2->cb[] in ip6ip6_err()
CVE-2026-74587 9.8 CRITICAL sctp: fix use-after-free of cached ASCONF chunk
CVE-2026-74586 9.8 CRITICAL sctp: clear new_transport when removing a peer
CVE-2026-74591 9.8 CRITICAL mm/filemap: __filemap_add_folio() restore index before retrying
CVE-2026-74588 9.8 CRITICAL sctp: keep chunk->transport in step with the list it is queued on
CVE-2026-74730 9.8 CRITICAL NFS: Pin the 'struct nfs_server' during a FREE_STATEID call
CVE-2026-74669 9.8 CRITICAL ipvs: clear IPv4 options after rebasing tunnel ICMP errors
CVE-2026-74712 9.3 CRITICAL vdpa/mlx5: Fix buffer length in create_direct_keys()
CVE-2026-74665 9.1 CRITICAL net: fix skb length accounting after generic XDP frag adjustment

Showing top 20 of 149 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74664

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