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CVE-2026-72036— net/sched: sch_multiq: Replace direct dequeue call with peek and qdisc_dequeue_peeked

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 2.6.29版本存在安全漏洞，该漏洞源于net/sched的sch_multiq多队列调度器直接调用dequeue函数，而非使用qdisc_dequeue_peeked，导致非工作守恒子队列的skb被孤立，qlen/backlog不同步，进而解引用空指针，可能导致内核崩溃。

CVSS 7.8 · High EPSS 0.16% · P6

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 77be155cba4e163e8bba9fd27222a8b6189ec4f7< 3e5fd9d14f2d228e7260251f2e4a1d41ba8f705a affected
77be155cba4e163e8bba9fd27222a8b6189ec4f7< eb1a9637f0bd84b5db8803af65dfb1f44785406f affected
77be155cba4e163e8bba9fd27222a8b6189ec4f7< 7a5a1582710981ef6637de9f074a60a5b1d63222 affected
77be155cba4e163e8bba9fd27222a8b6189ec4f7< 86a61e46a1919e8abf4d227c204773dabb24068a affected
77be155cba4e163e8bba9fd27222a8b6189ec4f7< 1b9cc255e8089606b92b2adf504e334573682821 affected
77be155cba4e163e8bba9fd27222a8b6189ec4f7< 5889064919a1e5c0a9469c54895000414fc46944 affected
77be155cba4e163e8bba9fd27222a8b6189ec4f7< fffeb2ab5eeb823d4c2330571a098f63237c9049 affected
77be155cba4e163e8bba9fd27222a8b6189ec4f7< 54f6b0c843e228d499eb4b6bbb89df68cad9ad5d affected
… +10 more rows
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I. Basic Information for CVE-2026-72036

Vulnerability Information
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Vulnerability Title
net/sched: sch_multiq: Replace direct dequeue call with peek and qdisc_dequeue_peeked
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_multiq: Replace direct dequeue call with peek and qdisc_dequeue_peeked multiq_dequeue() takes a packet from a band's child with a direct ->dequeue() call after multiq_peek() peeked it. When the child is non-work-conserving the peek stashes the skb in the child's gso_skb, so the direct dequeue returns a different skb and orphans the stash, desyncing the child's qlen/backlog. With a qfq child reached through a peeking parent (e.g. tbf) this re-enters the child on an emptied list and dereferences NULL, panicking the kernel from softirq on ordinary egress. Take the packet through qdisc_dequeue_peeked(), as sch_prio already does and as sch_red and sch_sfb were just fixed to do. The helper is a no-op when the child has no stash, so a work-conserving child is unaffected.
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
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 2.6.29版本存在安全漏洞，该漏洞源于net/sched的sch_multiq多队列调度器直接调用dequeue函数，而非使用qdisc_dequeue_peeked，导致非工作守恒子队列的skb被孤立，qlen/backlog不同步，进而解引用空指针，可能导致内核崩溃。
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 77be155cba4e163e8bba9fd27222a8b6189ec4f7 ~ 3e5fd9d14f2d228e7260251f2e4a1d41ba8f705a -
Linux Linux 2.6.29 -

II. Public POCs for CVE-2026-72036

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III. Intelligence Information for CVE-2026-72036

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Patches & Fixes for CVE-2026-72036 (8)

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

CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
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-2026-72421 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-2026-72451 9.8 CRITICAL xfrm: Fix xfrm state cache insertion race
CVE-2026-72323 9.8 CRITICAL ipv4: igmp: Fix potential UAF in igmp_gq_start_timer()
CVE-2026-72322 9.8 CRITICAL ipv6: mcast: Fix potential UAF in MLD delayed work
CVE-2026-72436 9.8 CRITICAL netfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types
CVE-2026-72129 9.8 CRITICAL nvmet-rdma: handle inline data with a nonzero offset
CVE-2026-72130 9.8 CRITICAL nvmet-auth: reject short AUTH_RECEIVE buffers
CVE-2026-72206 9.8 CRITICAL ntfs: validate index block header more strictly
CVE-2026-74384 9.8 CRITICAL nvme-multipath: fix flex array size in struct nvme_ns_head
CVE-2026-72319 9.8 CRITICAL ipvs: ensure inner headers in ICMP errors are in headroom
CVE-2026-72317 9.8 CRITICAL SUNRPC: pin upper rpc_clnt across the TLS connect_worker
CVE-2026-72137 9.8 CRITICAL xfrm: nat_keepalive: avoid double free on send error
CVE-2026-74433 9.8 CRITICAL rxrpc: Fix UAF in rxgk_issue_challenge()

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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