CVE-2026-92520— bpf: Zero queue and stack outputs on lock failure
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： bpf: 在锁获取失败时清零队列和栈的输出 队列（queue）和栈（stack）的 pop/peek 辅助函数之所以接受未初始化的输出缓冲区，是因为验证器（verifier）期望该辅助函数负责初始化该缓冲区。当 map 为空时，错误路径会清除缓冲区；但当锁获取失败时，函数直接返回 -EBUSY，而未对缓冲区进行写入操作。 修复方式是：在返回 -EBUSY 之前先清零输出缓冲区，从而确保 BPF 程序在辅助函数调用失败后无法观察到未初始化的栈内容。
Possible ATT&CK Techniques 1 AI
T1055 · Process InjectionAffected Version Matrix 18
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | a34a9f1a19afe9c60ca0ea61dfeee63a1c2baac8< 1534c4bff3aaca19c4c9a82f93e9b81f7c983de3 |
affected |
a34a9f1a19afe9c60ca0ea61dfeee63a1c2baac8< e2396b8a562073787e627a5f483f1bc5c452fa6a |
affected | ||
a34a9f1a19afe9c60ca0ea61dfeee63a1c2baac8< 7ac6e1ae41a09f1dd4baeeff1d028ae49ee01232 |
affected | ||
40e34ea01748e5b8afdd40a172868be1e1ab0ede |
affected | ||
388c9d3eefaea99828ee5000c693128a5b41ee7c |
affected | ||
acabf5df49aa3a4f9c96200102d893351b511a88 |
affected | ||
e388671635acf470f0986d874389148fd234620b |
affected | ||
232f0ba4d69263af5912e279fcc32fef2882b1dc |
affected | ||
| … +10 more rows | |||
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2026-92520
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
bpf: Zero queue and stack outputs on lock failure
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
bpf: Zero queue and stack outputs on lock failure
Queue and stack pop/peek helpers accept an uninitialized output buffer
because the verifier expects the helper to initialize it. The empty-map
error path clears the buffer, but a failed lock acquisition returns
-EBUSY without writing it.
Clear the output before returning -EBUSY so BPF programs cannot observe
uninitialized stack contents after a failed helper call.
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
Affected Products
II. Public POCs for CVE-2026-92520
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-92520
请登录查看更多情报信息。
Patches & Fixes for CVE-2026-92520 (3)
Same Patch Batch · Linux · 2026-09-17 · 600 CVEs total
| CVE-2026-92489 | 9.8 CRITICAL | xfrm: Fix skb double-free in xfrm_dev_direct_output() |
| CVE-2026-90235 | 9.8 CRITICAL | sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE |
| CVE-2026-90173 | 9.8 CRITICAL | smb: smbdirect: free completion queues with ib_free_cq() |
| CVE-2026-90104 | 9.8 CRITICAL | NFSv4.1: zero referring call lists before decoding |
| CVE-2026-90151 | 9.8 CRITICAL | NFSv4: remove callback IDR entry on client allocation failure |
| CVE-2026-90110 | 9.4 CRITICAL | inetpeer: randomize RB-tree node comparison using SipHash |
| CVE-2026-90230 | 9.1 CRITICAL | nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate() |
| CVE-2026-90414 | 9.1 CRITICAL | IB/isert: reject PDUs declaring more data than was received |
| CVE-2026-90413 | 9.1 CRITICAL | IB/isert: reject login PDUs declaring more data than was received |
| CVE-2026-90367 | 8.8 HIGH | wifi: mt76: mt7996: hold dev->mt76.mutex while disabling tx worker in SER |
| CVE-2026-90329 | 8.8 HIGH | HID: synchronize input before cleaning up a failed probe |
| CVE-2026-93189 | 8.8 HIGH | HID: core: quiesce input in hid_hw_stop() to prevent use-after-free |
| CVE-2026-90240 | 8.8 HIGH | iommu/vt-d: Flush context cache with correct SID when tearing down aliases |
| CVE-2026-90357 | 8.8 HIGH | wifi: mt76: mt7915: unlink TWT flow if the MCU rejects the agreement |
| CVE-2026-90286 | 8.8 HIGH | drm/amdgpu/gfx6: Use PFP on the compute queues too |
| CVE-2026-93042 | 8.8 HIGH | dmaengine: dw-edma: Terminate all descriptors without callbacks |
| CVE-2026-90256 | 8.8 HIGH | Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind |
| CVE-2026-90380 | 8.8 HIGH | wifi: mt76: mt792x: fix use-after-free in mt76_rx_poll_complete |
| CVE-2026-90381 | 8.8 HIGH | wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx() |
| CVE-2026-90425 | 8.8 HIGH | iommu/tegra241-cmdqv: Require exactly one Stream ID for a vSID |
Showing top 20 of 600 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
-
CVE-2026-98385
sched/cache: Decouple sched_cache_group from mm to fix UAF -
CVE-2026-98384
bpf: Fix out-of-bounds read of sk_protocol in bpf_sock_destr -
CVE-2026-98383
bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL -
CVE-2026-98382
bpf: Reject dev-bound-only programs on other devices -
CVE-2026-98381
veth: manage XDP program pointers during channel resize
Same vendor: Linux
-
CVE-2026-98385
sched/cache: Decouple sched_cache_group from mm to fix UAF -
CVE-2026-98384
bpf: Fix out-of-bounds read of sk_protocol in bpf_sock_destr -
CVE-2026-98383
bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL -
CVE-2026-98382
bpf: Reject dev-bound-only programs on other devices -
CVE-2026-98381
veth: manage XDP program pointers during channel resize
V. Comments for CVE-2026-92520
No comments yet