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CVE-2026-74663— net/sched: reject overly deep qdisc hierarchies

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： net/sched：拒绝过于深层的 qdisc 层次结构 过深的 qdisc 层次结构可能导致 qdisc 树遍历器出现过度递归，从而耗尽内核栈空间。现有的循环检查机制并未涵盖“创建并嫁接（create-and-graft）”路径，因此，即使父级 qdisc 已经处于深层结构中，仍可通过在其下方创建新的子 qdisc 来进一步扩展层次深度。 解决方案是将层次深度信息存储在 struct Qdisc 结构中，并在 qdisc 被嫁接时更新该深度值。一旦父级 qdisc 已达到

CVSS 7.8 · High EPSS 0.13% · P3

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 9f69bb9fdaa2fe64b68bb62fb84d405784bee540 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 8ca8cdb74939581339e1ae370193c0adb5a85336 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 2759acf08a3454866660edcd3ef4e64139f254a6 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< a4b14a4df29d36458a943f9b521ddd0f940363cc affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< e2d658c6427844cee5bc654b436ca68d680b6148 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< dedd34b0f2310e28c5f6d4875cfbf4b7ed821c01 affected
2.6.12 affected
< 2.6.12 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-74663

Vulnerability Information
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Vulnerability Title
net/sched: reject overly deep qdisc hierarchies
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net/sched: reject overly deep qdisc hierarchies Deep qdisc hierarchies can lead to excessive recursion in qdisc tree walkers and exhaust the kernel stack. The existing loop check does not cover the create-and-graft path, so a hierarchy can still be extended by creating a new child qdisc below an already deep parent. Store the hierarchy depth in struct Qdisc and update it when qdiscs are grafted. Reject new child qdiscs once the parent is already at the maximum allowed depth.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/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 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ 9f69bb9fdaa2fe64b68bb62fb84d405784bee540 -
Linux Linux 2.6.12 -

II. Public POCs for CVE-2026-74663

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III. Intelligence Information for CVE-2026-74663

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Patches & Fixes for CVE-2026-74663 (6)

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-2026-74616 9.8 CRITICAL xdp: reject clones that overrun skb_shared_info tailroom
CVE-2026-74591 9.8 CRITICAL mm/filemap: __filemap_add_folio() restore index before retrying
CVE-2026-74662 9.8 CRITICAL inet: frags: publish queues before arming timer
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-2026-74587 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-2026-74611 9.8 CRITICAL tls: rx: restore msg_iter before TLS 1.3 optimistic retry
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-2026-74597 9.8 CRITICAL ip6_tunnel: clear skb2->cb[] in ip6ip6_err()
CVE-2026-74688 9.8 CRITICAL sctp: clear control chunk transport if it is being removed
CVE-2026-74723 9.8 CRITICAL btrfs: lzo: reject inline extents without valid headers
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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