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CVE-2026-74704— net/sched: sch_cake: drop WARN_ON(1) for malformed packets in ACK filter

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: sch_cake: 在 ACK 过滤器中移除对畸形数据包触发的 WARN_ON(1) sch_cake 的 ACK 过滤器会解析数据包以查找 TCP 头，并在流存在积压时过滤重复的 ACK。解析代码中包含一个 ，在特定情况下可能被畸形 IP 头触发。根据系统配置的不同，这会导致 dmesg 中大量输出警告，或者在设置了 时触发系统恐慌（panic）。 代码实际上已经在触发警告的分支中正确跳过了问题数据包，因此 本身并无实际作用。因此，直接移除该 以避免

CVSS 8.2 · High EPSS 0.44% · P37

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 8b7138814f29933898ecd31dfc83e35a30ee69f5< c1693b7844a6c06d31a565e5a494948034dfd235 affected
8b7138814f29933898ecd31dfc83e35a30ee69f5< a4b52612004a5639c4bfc30ba93ba414b8326e2a affected
8b7138814f29933898ecd31dfc83e35a30ee69f5< ae1b2f8e21a41e7c7e75511bea0c4ccc59ec1bd3 affected
8b7138814f29933898ecd31dfc83e35a30ee69f5< 0c4882bff34558d8d53fb04c3e96da5c327c7dc8 affected
8b7138814f29933898ecd31dfc83e35a30ee69f5< 2504a76e5c0694e14e15562730e1339f2d9f9458 affected
8b7138814f29933898ecd31dfc83e35a30ee69f5< cd2f1d9fe8a507c2dc86ad326fe221f121c47734 affected
8b7138814f29933898ecd31dfc83e35a30ee69f5< a1ae353d8355407c1bea971d1c1af5e7f242bb7d affected
8b7138814f29933898ecd31dfc83e35a30ee69f5< 2a33516f9ef59ad11844d4fc152f889449b5daf3 affected
… +10 more rows
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I. Basic Information for CVE-2026-74704

Vulnerability Information
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Vulnerability Title
net/sched: sch_cake: drop WARN_ON(1) for malformed packets in ACK filter
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_cake: drop WARN_ON(1) for malformed packets in ACK filter The sch_cake ACK filter parses packets to find the TCP header and filter duplicated ACKs if the flow is backlogged. The parsing code contains a WARN_ON(1) which can be triggered by a malformed IP header in certain cases. Depending on the system configuration, this leads either to either spamming dmesg with warnings, or a panic if panic_on_warn is set. The code already correctly skips the offending packet in the branch that triggers the warning, so the WARN_ON itself doesn't really serve any purpose. So just drop it altogether to avoid the inconvenient side effects.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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 8b7138814f29933898ecd31dfc83e35a30ee69f5 ~ c1693b7844a6c06d31a565e5a494948034dfd235 -
Linux Linux 4.19 -

II. Public POCs for CVE-2026-74704

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III. Intelligence Information for CVE-2026-74704

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Patches & Fixes for CVE-2026-74704 (7)

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-2026-74611 9.8 CRITICAL tls: rx: restore msg_iter before TLS 1.3 optimistic retry
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-2026-74628 9.8 CRITICAL net/x25: fix use-after-free of the socket by its timers
CVE-2026-74616 9.8 CRITICAL xdp: reject clones that overrun skb_shared_info tailroom
CVE-2026-74587 9.8 CRITICAL sctp: fix use-after-free of cached ASCONF chunk
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-2026-74730 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-2026-74662 9.8 CRITICAL inet: frags: publish queues before arming timer
CVE-2026-74588 9.8 CRITICAL sctp: keep chunk->transport in step with the list it is queued on
CVE-2026-74669 9.8 CRITICAL ipvs: clear IPv4 options after rebasing tunnel ICMP errors
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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