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CVE-2026-74694— net/ncsi: fix heap OOB read in NCSI_CMD_SEND_CMD payload length

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.

在 Linux 内核中，已修复以下漏洞： 网络 NCSI：修复 NCSI_CMD_SEND_CMD 载荷长度中的堆越界读取（Heap OOB Read） 函数从攻击者可控的带内数据包头 字段中获取要复制的字节数，而源缓冲区是 netlink 属性，其可读大小为 。这两个长度来源从未进行交叉校验：仅强制执行 的检查。 当 被设置为大于属性载荷的值时（最大可达 65535，而最多只有 2032 个可读字节）， 会通过 超出 netlink 属性缓冲区的末尾进行读取，从而将最多约 64KB 的内核堆内存泄漏到传输的 NC

AI Predicted 7.8 Difficulty: Moderate EPSS 0.18% · P7

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392< e60afa01d35f8b2671b27ca93309921427144cce affected
9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392< 67c72b8ef63d9d9a610546fda30b116638f39745 affected
9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392< 4489b4a17892750131e4bef4bc1d3d703c8fb5ba affected
9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392< 43c7d0a6917751ea898ae584d00f24f5deac46d4 affected
9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392< b5231ad0b376b801ab8cf2962b182cc29deaedb3 affected
9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392< 02226af69362758046822840fc6a497f5de33f00 affected
9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392< 3a60b5af75abe8e3494ccd074fb4ae6e601a3e55 affected
9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392< afa58b7384913c8773d837acdb07b035690ec5d2 affected
… +10 more rows
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I. Basic Information for CVE-2026-74694

Vulnerability Information
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Vulnerability Title
net/ncsi: fix heap OOB read in NCSI_CMD_SEND_CMD payload length
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net/ncsi: fix heap OOB read in NCSI_CMD_SEND_CMD payload length ncsi_send_cmd_nl() takes the number of bytes to copy from the attacker-controlled ncsi_pkt_hdr.length field of the in-band packet header, while the source buffer is the NCSI_ATTR_DATA netlink attribute whose readable size is nla_len() - sizeof(ncsi_pkt_hdr). The two length sources are never cross-checked: only nla_len() >= sizeof(struct ncsi_pkt_hdr) is enforced. With hdr->length set larger than the attribute payload (up to 65535 against at most 2032 readable bytes), ncsi_cmd_handler_oem() copies past the end of the netlink attribute buffer with unsafe_memcpy(), leaking up to ~64KB of kernel heap memory into the transmitted NCSI command packet. The destination skb is sized by the declared payload, so the write side does not overflow - this is a pure OOB read / information leak, reachable with CAP_NET_ADMIN on systems with a registered NCSI device (e.g. OpenBMC on Aspeed BMC SoCs, where NET_NCSI=y is standard). Reject commands whose declared payload extends past the end of the data attribute. The issue was found by the autokbug dynamic kernel fuzzer at Tencent Yunding Lab.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392 ~ e60afa01d35f8b2671b27ca93309921427144cce -
Linux Linux 4.20 -

II. Public POCs for CVE-2026-74694

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III. Intelligence Information for CVE-2026-74694

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Patches & Fixes for CVE-2026-74694 (8)

Same Patch Batch · Linux · 2026-08-22 · 150 CVEs total

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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