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CVE-2026-74736— net/sched: cls_bpf: reject dev-bound programs bound to a different device

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，以下漏洞已修复： net/sched: cls_bpf：拒绝将绑定到不同设备的 dev-bound 程序进行附加 通过 获取了 SCHED_CLS 类型的程序，但从未验证设备绑定（offloaded）程序的绑定网络设备是否与正在附加该分类器的 TC 网络设备相匹配。这导致了一个使用 针对设备 A 加载的程序，可以通过 + 被附加到设备 B。当随后删除设备 A 时，该程序的 offload 状态在仍附加于设备 B 的情况下被销毁，从而触发了 netdevsim 的 WARN（若设置 则会引发

CVSS 7.8 · High EPSS 0.14% · P3

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 2b3486bc2d237ec345b3942b7be5deabf8c8fed1< ec5a552f4b2d841c6c021752450716e1a9676661 affected
2b3486bc2d237ec345b3942b7be5deabf8c8fed1< daf546ab5763ce6a18280cb4db060e836c515301 affected
2b3486bc2d237ec345b3942b7be5deabf8c8fed1< adb3e7c26a51a10d94a241c6de7a81a2863dcacf affected
2b3486bc2d237ec345b3942b7be5deabf8c8fed1< 5685bbbd3cbfbeb0de96a1d275a5ca073dfebb5e affected
2b3486bc2d237ec345b3942b7be5deabf8c8fed1< 120977e2c096deea4e866e4273be9220b957c29e affected
6.3 affected
< 6.3 unaffected
6.6.153≤ 6.6.* unaffected
… +4 more rows
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I. Basic Information for CVE-2026-74736

Vulnerability Information
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Vulnerability Title
net/sched: cls_bpf: reject dev-bound programs bound to a different device
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net/sched: cls_bpf: reject dev-bound programs bound to a different device cls_bpf_prog_from_efd() obtained a SCHED_CLS program via bpf_prog_get_type_dev() but never verified that a device-bound (offloaded) program's bound netdev matches the TC netdev the classifier is being attached to. This let a program loaded with prog_ifindex for device A be attached via cls_bpf + skip_sw to device B; deleting device A then destroyed the program's offload state while it was still attached to device B, triggering a netdevsim WARN (panic with panic_on_warn=1). Mirror the XDP attach path (net/core/dev.c) and reject the attach with -EINVAL when a dev-bound program's bound device does not match the target device.
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 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 ~ ec5a552f4b2d841c6c021752450716e1a9676661 -
Linux Linux 6.3 -

II. Public POCs for CVE-2026-74736

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III. Intelligence Information for CVE-2026-74736

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Patches & Fixes for CVE-2026-74736 (5)

Same Patch Batch · Linux · 2026-08-26 · 92 CVEs total

CVE-2026-80557 9.8 CRITICAL libceph: fix OOB read in decode_watchers() via missing bounds check
CVE-2026-80589 9.8 CRITICAL block: stop the timeout timer when releasing a never added disk
CVE-2026-74737 9.8 CRITICAL net: ethernet: ti: am65-cpsw-nuss: Fix port_id extraction from SRC TAG
CVE-2026-74752 9.8 CRITICAL sctp: validate cookie AUTH state before use
CVE-2026-80587 9.8 CRITICAL mptcp: avoid combining some incoming suboptions
CVE-2026-80558 9.8 CRITICAL libceph: Avoid using invalid osd indices from primary_temp
CVE-2026-80528 9.8 CRITICAL ceph: avoid fs reclaim while using current->journal_info
CVE-2026-74743 9.8 CRITICAL macvlan: inherit needed_headroom and needed_tailroom from lowerdev
CVE-2026-74744 9.8 CRITICAL ipvlan: inherit needed_headroom and needed_tailroom from phy_dev
CVE-2026-80586 9.8 CRITICAL mptcp: options: reset DSS fields in case of unexpected size
CVE-2026-74746 9.8 CRITICAL netfilter: flowtable: publish GC-visible tuple last
CVE-2026-80561 9.8 CRITICAL libceph: fix multiple unsafe decodes in decode_locker()
CVE-2026-80519 9.8 CRITICAL ovpn: finish crypto callback cleanup before peer release
CVE-2026-74751 9.4 CRITICAL riscv: lib: Fix ZBB strnlen reading past count boundary
CVE-2026-80585 9.4 CRITICAL mptcp: fastopen: only mark MPTFO subflows with SYN data
CVE-2026-80554 9.3 CRITICAL s390/vfio_ccw: Limit the number of channel program segments
CVE-2026-80551 9.3 CRITICAL s390/vfio_ccw: Ensure first IDAW remains constant
CVE-2026-80576 8.8 HIGH drm/amdgpu: reject oversized IBs with per-ring packet limits
CVE-2026-80553 8.8 HIGH s390/vfio_ccw: Cancel existing workqueues
CVE-2026-80547 8.8 HIGH s390/vfio_ccw: Implement a crw lock

Showing top 20 of 92 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74736

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