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CVE-2026-93149— wifi: mac80211_hwsim: avoid NULL skb in stop queue drain

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： wifi: mac80211_hwsim: 在停止队列排空时避免出现 NULL skb 会丢弃 中残留的帧。当前循环先检查 ，然后单独执行出队操作。 这种分离的操作与 TX 状态处理存在竞态条件，因为 TX 状态处理可能在队列锁保护下移除待处理帧。如果在检查队列是否为空之后，最后一个条目被移除， 将返回 NULL，而停止路径会将该 NULL 的 skb 传递给 。 修复方法是改用 作为循环条件。出队的结果是由 stop 路径拥有并释放的对象；如果并发的状态完成事件恰好清空了

AI Predicted 5.5 Difficulty: Hard EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux bd18de517923903a177508fc8813f44e717b1c00< d131027054a8dd922dda01fe8d381abe5af4970b affected
bd18de517923903a177508fc8813f44e717b1c00< c40ba47f2ba1951cb32ea048667ed014d36a5749 affected
bd18de517923903a177508fc8813f44e717b1c00< 2817431a61557f46dc63077b7cc126bc906c242e affected
bd18de517923903a177508fc8813f44e717b1c00< e7fccad2c8e6ef6bbafe509c95869d161d0f466b affected
bd18de517923903a177508fc8813f44e717b1c00< 1c2a4ab6efa26415dd131b8c222e7893fda03435 affected
bd18de517923903a177508fc8813f44e717b1c00< 158438cd6ad69d6dd7d871582c38baf22169fede affected
78bf3c6131488b00386acd9aff1ea4e6c44fa38e affected
a9028333001f793b2724e8be42fce3336de2cf1c affected
… +12 more rows
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I. Basic Information for CVE-2026-93149

Vulnerability Information
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Vulnerability Title
wifi: mac80211_hwsim: avoid NULL skb in stop queue drain
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211_hwsim: avoid NULL skb in stop queue drain mac80211_hwsim_stop() drops any frames left in data->pending. The loop currently checks skb_queue_empty() and then dequeues separately. That split is racy with TX status handling, which can remove a pending frame under the queue lock. If the last entry is removed after the empty check, skb_dequeue() returns NULL and the stop path passes that NULL skb to ieee80211_free_txskb(). Use skb_dequeue() as the loop condition instead. The dequeue result is the object that stop owns and frees, and a concurrent status completion that empties the queue simply makes the loop terminate.
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux bd18de517923903a177508fc8813f44e717b1c00 ~ d131027054a8dd922dda01fe8d381abe5af4970b -
Linux Linux 5.13 -

II. Public POCs for CVE-2026-93149

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III. Intelligence Information for CVE-2026-93149

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Patches & Fixes for CVE-2026-93149 (6)

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-2026-90151 9.8 CRITICAL NFSv4: remove callback IDR entry on client allocation failure
CVE-2026-90235 9.8 CRITICAL sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE
CVE-2026-90104 9.8 CRITICAL NFSv4.1: zero referring call lists before decoding
CVE-2026-90173 9.8 CRITICAL smb: smbdirect: free completion queues with ib_free_cq()
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-2026-90413 9.1 CRITICAL IB/isert: reject login PDUs declaring more data than was received
CVE-2026-90414 9.1 CRITICAL IB/isert: reject PDUs declaring more data than was received
CVE-2026-90425 8.8 HIGH iommu/tegra241-cmdqv: Require exactly one Stream ID for a vSID
CVE-2026-93042 8.8 HIGH dmaengine: dw-edma: Terminate all descriptors without callbacks
CVE-2026-93189 8.8 HIGH HID: core: quiesce input in hid_hw_stop() to prevent use-after-free
CVE-2026-90329 8.8 HIGH HID: synchronize input before cleaning up a failed probe
CVE-2026-90357 8.8 HIGH wifi: mt76: mt7915: unlink TWT flow if the MCU rejects the agreement
CVE-2026-90256 8.8 HIGH Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
CVE-2026-90367 8.8 HIGH wifi: mt76: mt7996: hold dev->mt76.mutex while disabling tx worker in SER
CVE-2026-90381 8.8 HIGH wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx()
CVE-2026-90379 8.8 HIGH wifi: mt76: mt7921: Add PCIe AER handler support to prevent system crash
CVE-2026-90380 8.8 HIGH wifi: mt76: mt792x: fix use-after-free in mt76_rx_poll_complete
CVE-2026-90371 8.8 HIGH wifi: mt76: fix RXDMAD_C buffer recycling race

Showing top 20 of 600 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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