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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.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于在将分片队列插入到fqdir哈希表之前就启动了分片队列定时器，如果命名空间分片超时为零或负数，定时器可能在队列发布前运行，导致定时器回调尝试移除尚未发布的节点并丢弃哈希引用，留下过时哈希节点，造成哈希引用不平衡。

CVSS 9.8 · Critical EPSS 0.51% · P42

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux 648700f76b03b7e8149d13cc2bdb3355035258a9< f4e4dab62181b7fe7c011bed6fbef9fc3d48c769 affected
648700f76b03b7e8149d13cc2bdb3355035258a9< 4ed0681dc2c1e0538b79d2fc56190ffcb369dacd affected
648700f76b03b7e8149d13cc2bdb3355035258a9< 08a04d7bfb9c103432561aff8a62b6872e694a6a affected
648700f76b03b7e8149d13cc2bdb3355035258a9< d3ffb89b2944672cf7bdd8e9ee577d2043b4a956 affected
648700f76b03b7e8149d13cc2bdb3355035258a9< 39c6c4b267b65f00e0b0335a2ae00cbe9e3174f0 affected
648700f76b03b7e8149d13cc2bdb3355035258a9< 9f904dd3e455750e5d4ec9b2f134835811b85a2f affected
648700f76b03b7e8149d13cc2bdb3355035258a9< 928128865e43b197e30688dc1bc991592c97edcf affected
648700f76b03b7e8149d13cc2bdb3355035258a9< 653d7ddf6cba867777a3d14c4f83ace008c5ad13 affected
… +12 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
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存在安全漏洞，该漏洞源于在将分片队列插入到fqdir哈希表之前就启动了分片队列定时器，如果命名空间分片超时为零或负数，定时器可能在队列发布前运行，导致定时器回调尝试移除尚未发布的节点并丢弃哈希引用，留下过时哈希节点，造成哈希引用不平衡。
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 648700f76b03b7e8149d13cc2bdb3355035258a9 ~ f4e4dab62181b7fe7c011bed6fbef9fc3d48c769 -
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)

Other References for CVE-2026-74662 (4)

Same Patch Batch · Linux · 2026-08-22 · 149 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-2026-74628 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-2026-74617 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-2026-74608 9.8 CRITICAL smb: client: Fix use-after-free in cifs_try_adding_channels()
CVE-2026-74723 9.8 CRITICAL btrfs: lzo: reject inline extents without valid headers
CVE-2026-74727 9.8 CRITICAL ovpn: skip rehash for peers already removed from by_id
CVE-2026-74597 9.8 CRITICAL ip6_tunnel: clear skb2->cb[] in ip6ip6_err()
CVE-2026-74669 9.8 CRITICAL ipvs: clear IPv4 options after rebasing tunnel ICMP errors
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-2026-74730 9.8 CRITICAL NFS: Pin the 'struct nfs_server' during a FREE_STATEID call
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-2026-74712 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-2026-74607 8.8 HIGH KVM: SVM: Serialize accesses to the owner and mirror list with separate lock

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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