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CVE-2026-90393— bpf: Fix potential UAF in bpf_netns_link_update_prog

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，以下漏洞已得到修复： bpf：修复 bpf_netns_link_update_prog 中潜在的 UAF（Use-After-Free，释放后使用） 在 函数中，对 和程序类型的检查目前是在获取 互斥锁之前，以无锁（locklessly）方式执行的。这会产生一个竞态条件，可能导致 UAF 问题。 如果有两个线程同时对同一个 netns link 执行 ，以下执行路径可能触发 UAF： 修复方法： 通过将 和 的检查移动到 临界区内部来修复此问题。同时，使用 来简化锁管理，并避免所有 跳转。

AI Predicted 5.5 Difficulty: Hard EPSS 0.24% · P13

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 7f045a49fee04b5662cbdeaf0838f9322ae8c63a< d462b5481d77ce7df8a5ff89a699386f00c9214d affected
7f045a49fee04b5662cbdeaf0838f9322ae8c63a< bdddf3e1493ee973619c154a57071ce67f78598b affected
7f045a49fee04b5662cbdeaf0838f9322ae8c63a< 79a66fd997d4eecf17302d613194879eb32e0986 affected
7f045a49fee04b5662cbdeaf0838f9322ae8c63a< f4ce6803df4095777191d800bebc50219b615ca0 affected
7f045a49fee04b5662cbdeaf0838f9322ae8c63a< 277168cb9d153ce8e9c3f9275670e32ae61b41d6 affected
7f045a49fee04b5662cbdeaf0838f9322ae8c63a< bda86e9f31b9a296b6e64a51c91dc776fc9f613e affected
7f045a49fee04b5662cbdeaf0838f9322ae8c63a< 923f559e95b89b33c7e1793b3d8f7f4ec9b2e4b7 affected
7f045a49fee04b5662cbdeaf0838f9322ae8c63a< 5c5997836381010fc5907b36bc17d3b19407e933 affected
… +10 more rows
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I. Basic Information for CVE-2026-90393

Vulnerability Information
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Vulnerability Title
bpf: Fix potential UAF in bpf_netns_link_update_prog
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix potential UAF in bpf_netns_link_update_prog In bpf_netns_link_update_prog, the checks for old_prog and prog type are currently performed locklessly before acquiring netns_bpf_mutex. This creates a race condition that can lead to a UAF issue. If two threads concurrently execute BPF_LINK_UPDATE on the same netns link, the following execution path can trigger a UAF: CPU0 CPU1 bpf_netns_link_update_prog if (old_prog && old_prog != link->prog) return -EPERM; bpf_netns_link_update_prog if (old_prog && old_prog != link->prog) ... old_prog = xchg(&link->prog, new_prog); bpf_prog_put(old_prog); if (new_prog->type != link->prog->type) <-- trigger UAF Fix this by moving the old_prog and prog->type checks inside the netns_bpf_mutex critical section. Meanwhile, use guard() to simplify lock management and avoid all the goto jumping.
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 7f045a49fee04b5662cbdeaf0838f9322ae8c63a ~ d462b5481d77ce7df8a5ff89a699386f00c9214d -
Linux Linux 5.8 -

II. Public POCs for CVE-2026-90393

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III. Intelligence Information for CVE-2026-90393

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Patches & Fixes for CVE-2026-90393 (8)

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-2026-90151 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-2026-90110 9.4 CRITICAL inetpeer: randomize RB-tree node comparison using SipHash
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-2026-90414 9.1 CRITICAL IB/isert: reject PDUs declaring more data than was received
CVE-2026-90255 8.8 HIGH Bluetooth: hci_conn: fix the SCO setup context lifetime
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-2026-90367 8.8 HIGH wifi: mt76: mt7996: hold dev->mt76.mutex while disabling tx worker in SER
CVE-2026-90256 8.8 HIGH Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
CVE-2026-90371 8.8 HIGH wifi: mt76: fix RXDMAD_C buffer recycling race
CVE-2026-93189 8.8 HIGH HID: core: quiesce input in hid_hw_stop() to prevent use-after-free
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-2026-90162 8.8 HIGH ksmbd: defer publishing granted locks to prevent UAF/double-free race
CVE-2026-90286 8.8 HIGH drm/amdgpu/gfx6: Use PFP on the compute queues too

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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