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CVE-2026-74631— net: smc: fix splice entry lifetime imbalance in smc_rx_splice

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，以下漏洞已得到修复： net: smc: 修复 smc_rx_splice 中 splice 条目的生命周期不平衡问题 在获取覆盖每个 splice 条目生命周期的引用之前，就将页（pages）传递给了 。在基于虚拟内存（VM-backed）的 RMB（远程内存缓冲）路径中， 可能会通过 丢弃未入队的条目，而已入队的条目则稍后通过管道缓冲区回调进行释放。 旧的 splice 后计数逻辑基于在构建描述符过程中被修改的偏移量来计算已入队的 VM 页数量，并且对于多页 splice 操作，它仅进行

CVSS 8.4 · High EPSS 0.14% · P3

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f< 7ddc7af2ae7fc5a0c0635b245c0824c8b76de5cb affected
9014db202cb764b8e14c53e7bacc81f9a1a2ba7f< 07ad246529d136d5ef441d5ab4c305d132ff3090 affected
9014db202cb764b8e14c53e7bacc81f9a1a2ba7f< c841789e456ec6751342fa800639ce8e82ff0e6b affected
9014db202cb764b8e14c53e7bacc81f9a1a2ba7f< af02c67ce654356c58db20a0bb2db33ace3b07a8 affected
9014db202cb764b8e14c53e7bacc81f9a1a2ba7f< ca8342b5fc24c249fdb998468f6a168b457c67e5 affected
9014db202cb764b8e14c53e7bacc81f9a1a2ba7f< 0b7d54cedea5cb158e21925ae0c6c2f5c87ed2a0 affected
9014db202cb764b8e14c53e7bacc81f9a1a2ba7f< 4515c78f4d9fd577270f012efeb062ea58b3682d affected
9014db202cb764b8e14c53e7bacc81f9a1a2ba7f< 5d9686af2976741bbd79b150d1c9e60b81e7f12e affected
… +10 more rows
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I. Basic Information for CVE-2026-74631

Vulnerability Information
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Vulnerability Title
net: smc: fix splice entry lifetime imbalance in smc_rx_splice
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: smc: fix splice entry lifetime imbalance in smc_rx_splice smc_rx_splice() passes pages to splice_to_pipe() before taking the references that cover the lifetime of each splice entry. In the VM-backed RMB path, splice_to_pipe() may drop unqueued entries through smc_rx_spd_release(), while queued entries are released later via the pipe buffer callback. The old post-splice accounting also derives the number of queued VM pages from an offset mutated while building the descriptor, and a multi-page splice pairs one sock_hold() with multiple sock_put() calls. Take the page and socket references for every candidate entry before splice_to_pipe(), and drop the matching private state, page reference, and socket reference from smc_rx_spd_release() for entries that never get queued. This fixes a refcount imbalance that can underflow page refcounts and trigger a use-after-free.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f ~ 7ddc7af2ae7fc5a0c0635b245c0824c8b76de5cb -
Linux Linux 4.18 -

II. Public POCs for CVE-2026-74631

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III. Intelligence Information for CVE-2026-74631

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Patches & Fixes for CVE-2026-74631 (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-2026-74587 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-2026-74688 9.8 CRITICAL sctp: clear control chunk transport if it is being removed
CVE-2026-74597 9.8 CRITICAL ip6_tunnel: clear skb2->cb[] in ip6ip6_err()
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-2026-74628 9.8 CRITICAL net/x25: fix use-after-free of the socket by its timers
CVE-2026-74608 9.8 CRITICAL smb: client: Fix use-after-free in cifs_try_adding_channels()
CVE-2026-74669 9.8 CRITICAL ipvs: clear IPv4 options after rebasing tunnel ICMP errors
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-2026-74727 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-2026-74723 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-2026-74611 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

V. Comments for CVE-2026-74631

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