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CVE-2026-74382— net/sched: cls_bpf: prevent unbounded recursion in offload rollback

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 4.15版本存在安全漏洞，该漏洞源于net/sched cls_bpf在offload回滚时存在无界递归，可能导致堆栈溢出。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.19% · P9

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 102740bd9436a3a6ba129af3a48271d794009fa5< a018f208ab7512380bd4cf670064d48cba00a1b1 affected
102740bd9436a3a6ba129af3a48271d794009fa5< 33373e1f378a501bc51aa73312f74295c84e3101 affected
102740bd9436a3a6ba129af3a48271d794009fa5< e2d3b7bab3748c811dc5750ce9a8d62bc7f90ed7 affected
102740bd9436a3a6ba129af3a48271d794009fa5< 4a76953c3ed043797e81529b9395e9ca6f4c7609 affected
102740bd9436a3a6ba129af3a48271d794009fa5< 1387f252a242a51bfbb6eace29c8f8db21b457da affected
102740bd9436a3a6ba129af3a48271d794009fa5< 10753da2d659dd425a6e620f47f86852d604f67f affected
102740bd9436a3a6ba129af3a48271d794009fa5< 3fa6fb5d771c992ebedbfa7331c6bcc6f33f89b7 affected
102740bd9436a3a6ba129af3a48271d794009fa5< 27db54b90bcc7c37867fe664107fa25ea6a116e4 affected
… +10 more rows
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I. Basic Information for CVE-2026-74382

Vulnerability Information
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Vulnerability Title
net/sched: cls_bpf: prevent unbounded recursion in offload rollback
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net/sched: cls_bpf: prevent unbounded recursion in offload rollback Quan Sun reported [1] a stack overflow in cls_bpf_offload_cmd(). Reproducer on netdevsim: add a skip_sw cls_bpf filter, set the bpf_tc_accept debugfs knob to 0, then `tc filter replace`. The replace calls tc_setup_cb_replace() which fails. cls_bpf_offload_cmd() then swaps prog/oldprog and recursively calls itself to roll back. But bpf_tc_accept=0 makes the rollback fail too, which triggers yet another rollback frame with the same arguments, and so on until the stack is exhausted. bpf_tc_accept is just a convenient knob for the reproducer. Any driver whose tc_setup_cb_replace() fails twice in a row can hit the same loop, so this is not a netdevsim-only issue. Two ways to fix it: 1) Have the rollback call tc_setup_cb_add() on oldprog instead of re-entering cls_bpf_offload_cmd(). 2) Mark the rollback frame with a flag and skip a second-level rollback from inside it. Go with (2). It is the smaller change and keeps the original behaviour: the rollback still goes through tc_setup_cb_replace(), so the driver gets one real chance to restore its state. If that attempt also fails, we just return the original error instead of recursing. [1]: https://lore.kernel.org/bpf/ce5a6005-3c5e-4696-9e05-eba9461dc860@std.uestc.edu.cn/T/#u
Source: CVE Program / CVE List V5
CVSS Information
N/A
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 4.15版本存在安全漏洞，该漏洞源于net/sched cls_bpf在offload回滚时存在无界递归，可能导致堆栈溢出。
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 102740bd9436a3a6ba129af3a48271d794009fa5 ~ a018f208ab7512380bd4cf670064d48cba00a1b1 -
Linux Linux 4.15 -

II. Public POCs for CVE-2026-74382

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III. Intelligence Information for CVE-2026-74382

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Patches & Fixes for CVE-2026-74382 (7)

Same Patch Batch · Linux · 2026-08-15 · 845 CVEs total

CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-74376 9.8 CRITICAL md/raid10: reset read_slot when reusing r10bio for discard
CVE-2026-72234 9.8 CRITICAL batman-adv: access unicast_ttvn skb->data only after skb realloc
CVE-2026-72339 9.8 CRITICAL qede: fix off-by-one in BD ring consumption on build_skb failure
CVE-2026-74255 9.8 CRITICAL tipc: fix UAF in tipc_l2_send_msg()
CVE-2026-72064 9.8 CRITICAL net: mana: Sync page pool RX frags for CPU
CVE-2026-72065 9.8 CRITICAL net: mana: Validate the packet length reported by the NIC
CVE-2026-72217 9.8 CRITICAL SUNRPC: Bound-check xdr_buf_to_bvec() stores before writing
CVE-2026-74473 9.8 CRITICAL vxlan: use pskb_network_may_pull() in route_shortcircuit()
CVE-2026-72323 9.8 CRITICAL ipv4: igmp: Fix potential UAF in igmp_gq_start_timer()
CVE-2026-74495 9.8 CRITICAL igbvf: Fix leak in TX DMA error cleanup
CVE-2026-72463 9.8 CRITICAL xfrm: Fix dev use-after-free in xfrm async resumption
CVE-2026-72069 9.8 CRITICAL locking/rt: Fix the incorrect RCU protection in rt_spin_unlock()

Showing top 20 of 845 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74382

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