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CVE-2026-74662— inet: frags: publish queues before arming timer

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： inet: frags: 在启动定时器之前发布队列 在将分片队列插入 的 哈希表之前，就启动了分片队列定时器。如果命名空间的分片超时时间为零或负数，定时器可能在队列尚未发布之前就触发执行。 定时器回调函数随后会将队列标记为已完成，尝试移除一个尚未存在于哈希表中的节点，并丢弃预期的哈希引用。此后，创建函数可能在没有恢复该引用的情况下发布已完成的队列，导致在调用者释放剩余引用后，哈希表中遗留一个无效的（stale）哈希节点。 解决方案是：先在持有队列锁的情况下发布队列，然后再启

CVSS 9.8 · Critical EPSS 0.44% · P37

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 648700f76b03b7e8149d13cc2bdb3355035258a9< 9f904dd3e455750e5d4ec9b2f134835811b85a2f affected
648700f76b03b7e8149d13cc2bdb3355035258a9< 928128865e43b197e30688dc1bc991592c97edcf affected
648700f76b03b7e8149d13cc2bdb3355035258a9< 653d7ddf6cba867777a3d14c4f83ace008c5ad13 affected
493107105843f299662b3b664a83804645564f12 affected
4.4.174< 4.5 affected
4.17 affected
< 4.17 unaffected
6.18.45≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-74662

Vulnerability Information
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Vulnerability Title
inet: frags: publish queues before arming timer
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: inet: frags: publish queues before arming timer inet_frag_create() arms the fragment queue timer before inserting the queue into the fqdir rhashtable. If the namespace fragment timeout is zero or negative, the timer can run before the queue is published. The timer callback then marks the queue complete, tries to remove a node that is not in the hash table yet, and drops the anticipated hash reference. Creation can subsequently publish the completed queue without restoring that reference, leaving a stale hash node after the caller drops the remaining reference. Publish the queue first and arm the timer while holding the queue lock. This makes timer expiry wait until the queue is visible in the hash table, so inet_frag_kill() can remove the node and balance the hash reference.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/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 648700f76b03b7e8149d13cc2bdb3355035258a9 ~ 9f904dd3e455750e5d4ec9b2f134835811b85a2f -
Linux Linux 4.17 -

II. Public POCs for CVE-2026-74662

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III. Intelligence Information for CVE-2026-74662

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Patches & Fixes for CVE-2026-74662 (3)

Same Patch Batch · Linux · 2026-08-22 · 150 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-2026-74730 9.8 CRITICAL NFS: Pin the 'struct nfs_server' during a FREE_STATEID call
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-2026-74608 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-2026-74688 9.8 CRITICAL sctp: clear control chunk transport if it is being removed
CVE-2026-74587 9.8 CRITICAL sctp: fix use-after-free of cached ASCONF chunk
CVE-2026-74588 9.8 CRITICAL sctp: keep chunk->transport in step with the list it is queued on
CVE-2026-74586 9.8 CRITICAL sctp: clear new_transport when removing a peer
CVE-2026-74727 9.8 CRITICAL ovpn: skip rehash for peers already removed from by_id
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-2026-74723 9.8 CRITICAL btrfs: lzo: reject inline extents without valid headers
CVE-2026-74611 9.8 CRITICAL tls: rx: restore msg_iter before TLS 1.3 optimistic retry
CVE-2026-74597 9.8 CRITICAL ip6_tunnel: clear skb2->cb[] in ip6ip6_err()
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
CVE-2026-74615 8.8 HIGH vxlan: do not arm the ageing timer on a device that is down

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-2026-74662

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