CVE-2026-90081— net/rds: use wq_has_sleeper() in rds_cong_map_updated()
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/rds：在 rds_cong_map_updated() 中使用 wq_has_sleeper() rds_cong_map_updated() 在对端拥塞映射被重写后执行（由 rds_tcp_cong_recv() 和 rds_ib_cong_recv()，或回环及 IB 发送完成路径中的全量清除触发）。该函数先递增 rds_cong_generation，然后检查 map->m_waitq 和 rds_poll_waitq 上的 waitqueue_active
Possible ATT&CK Techniques 2 AI
T1027 · Obfuscated Files or Information T1059 · Command and Scripting InterpreterAffected Version Matrix 18
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 922cb17a5c812fcc9ebee249f4109db099896941< 2a809d7896dbf18e1ecfbdd930f71c9fc298b16d |
affected |
922cb17a5c812fcc9ebee249f4109db099896941< fa4b98e891fda28cc0638d809c6125ec63d8319d |
affected | ||
922cb17a5c812fcc9ebee249f4109db099896941< 0e169f6a2adeb17b5577ed7e8abd642465bb50ec |
affected | ||
922cb17a5c812fcc9ebee249f4109db099896941< 42884bd8b8fd023d6a610a695bd5ddd1d5dece17 |
affected | ||
922cb17a5c812fcc9ebee249f4109db099896941< a526214b9f0548ca0e53a6e0d1727d8ea9befc23 |
affected | ||
922cb17a5c812fcc9ebee249f4109db099896941< bf2b8130723efcb5b86c3ddb6317c3a9b2a9cfc5 |
affected | ||
922cb17a5c812fcc9ebee249f4109db099896941< 281f9fda2e06d6c211bb365a5379ed2e05cc2e21 |
affected | ||
922cb17a5c812fcc9ebee249f4109db099896941< d4f484661961636eb90d287050959e613795f73a |
affected | ||
| … +10 more rows | |||
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I. Basic Information for CVE-2026-90081
Vulnerability Information
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Vulnerability Title
net/rds: use wq_has_sleeper() in rds_cong_map_updated()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
net/rds: use wq_has_sleeper() in rds_cong_map_updated()
rds_cong_map_updated() runs after a peer's congestion map has been
rewritten (by rds_tcp_cong_recv() and rds_ib_cong_recv(), or the
clear-all in the loopback and IB send-completion paths). It bumps
rds_cong_generation and then checks waitqueue_active() on
map->m_waitq and on rds_poll_waitq to decide whether anyone needs
waking. atomic_inc() carries no ordering and waitqueue_active() is a
plain load, so nothing orders the map and generation stores before
the wait queue reads. The waiters do the mirror image: rds_cong_wait()
adds itself to m_waitq and then tests the port bit, and rds_poll()
registers on rds_poll_waitq and then reads the generation. That is
the store-buffering pattern described above waitqueue_active() in
include/linux/wait.h - the updater can observe an empty wait queue
while the waiter still observes the port as congested, and no wake-up
is issued.
rds_cong_wait() is an interruptible sleep with no timeout, so a
sender blocked on a congested port stays blocked until the next
congestion update from that peer arrives or a signal is delivered.
A poll() waiter misses the map-updated notification the same way.
Use wq_has_sleeper(), which is waitqueue_active() preceded by the
required full barrier, as rds_tcp_state_change() already does for
the same pattern.
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-2026-90081
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Patches & Fixes for CVE-2026-90081 (7)
Other References for CVE-2026-90081 (1)
Same Patch Batch · Linux · 2026-09-17 · 600 CVEs total
| CVE-2026-90173 | 9.8 CRITICAL | smb: smbdirect: free completion queues with ib_free_cq() |
| CVE-2026-92489 | 9.8 CRITICAL | xfrm: Fix skb double-free in xfrm_dev_direct_output() |
| CVE-2026-90104 | 9.8 CRITICAL | NFSv4.1: zero referring call lists before decoding |
| CVE-2026-90235 | 9.8 CRITICAL | sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE |
| 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-2026-90414 | 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-2026-90230 | 9.1 CRITICAL | nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate() |
| CVE-2026-90381 | 8.8 HIGH | wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx() |
| CVE-2026-90329 | 8.8 HIGH | HID: synchronize input before cleaning up a failed probe |
| CVE-2026-90162 | 8.8 HIGH | ksmbd: defer publishing granted locks to prevent UAF/double-free race |
| CVE-2026-90357 | 8.8 HIGH | wifi: mt76: mt7915: unlink TWT flow if the MCU rejects the agreement |
| CVE-2026-90367 | 8.8 HIGH | wifi: mt76: mt7996: hold dev->mt76.mutex while disabling tx worker in SER |
| CVE-2026-90371 | 8.8 HIGH | wifi: mt76: fix RXDMAD_C buffer recycling race |
| CVE-2026-93042 | 8.8 HIGH | dmaengine: dw-edma: Terminate all descriptors without callbacks |
| CVE-2026-90425 | 8.8 HIGH | iommu/tegra241-cmdqv: Require exactly one Stream ID for a vSID |
| CVE-2026-90240 | 8.8 HIGH | iommu/vt-d: Flush context cache with correct SID when tearing down aliases |
| CVE-2026-90379 | 8.8 HIGH | wifi: mt76: mt7921: Add PCIe AER handler support to prevent system crash |
| CVE-2026-90256 | 8.8 HIGH | Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind |
Showing top 20 of 600 CVEs. View all on vendor page → →
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V. Comments for CVE-2026-90081
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