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CVE-2026-93138— bpf: Fix vmlinux BTF prep race in bpf_get_btf_vmlinux

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.

以下是该漏洞描述的中文翻译： 在 Linux 内核中，已修复以下漏洞： bpf：修复 bpf_get_btf_vmlinux 中 vmlinux BTF 初始化的竞态条件 函数在持有 互斥锁的情况下，对 vmlinux BTF 进行惰性解析。然而，该函数通过普通的存储操作发布结果，并在快速路径上通过普通的无锁加载操作重新检查。并没有任何机制能够保证 内部初始化 的存储操作与发布指针的存储操作之间具有顺序关系：在弱内存序架构上，一个并发调用者首次走无锁快速路径时，理论上可能在解析出的内容对读者可见之前观察到该指针。而

CVSS 7.8 · High EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1574 · Hijack Execution Flow

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 8580ac9404f6240668a026785d7d8856f0530409< f32a4a40bc635be25d6816da4bd91e9e58c31bf3 affected
8580ac9404f6240668a026785d7d8856f0530409< a7fe72d780122eb934536f1719abad445f6afdf7 affected
8580ac9404f6240668a026785d7d8856f0530409< e18a10b39c994f04e1ebd7f8fc042bb1ca8ad053 affected
8580ac9404f6240668a026785d7d8856f0530409< 978524ecfc1c539282df5858de1eec20748c6f74 affected
8580ac9404f6240668a026785d7d8856f0530409< eaf302628a78806f66d8224d6ba03fb4d5025de4 affected
8580ac9404f6240668a026785d7d8856f0530409< 2892f3f44bf865c8fb6b6c0960edec4cc91806ee affected
8580ac9404f6240668a026785d7d8856f0530409< 86d11c594d60b255b526fa5260f669463fb1a063 affected
8580ac9404f6240668a026785d7d8856f0530409< 92863e678070f57c17c868e4bfa2441a5c61ad2b affected
… +10 more rows
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I. Basic Information for CVE-2026-93138

Vulnerability Information
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Vulnerability Title
bpf: Fix vmlinux BTF prep race in bpf_get_btf_vmlinux
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix vmlinux BTF prep race in bpf_get_btf_vmlinux bpf_get_btf_vmlinux() lazily parses the vmlinux BTF under the bpf_verifier_lock, but publishes the result through a plain store and re-checks it through a plain lockless load. Nothing orders the stores initializing the struct btf inside btf_parse_vmlinux() against the store publishing the pointer: On a weakly ordered arch, a concurrent first-time caller taking the lockless fast path could in principle observe the pointer before the parsed contents are visible. The mutex_unlock() does not help such a reader given it only synchronizes with a later acquisition of the same lock. Thus, publish the pointer with smp_store_release() and read it on the fast path with smp_load_acquire(). Acquire semantics are needed rather than a dependency-ordered READ_ONCE(): btf_parse_vmlinux() also populates globals outside the returned object (e.g. bpf_ctx_convert.t). An address dependency would only order accesses performed through the pointer and not cover other globals.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 8580ac9404f6240668a026785d7d8856f0530409 ~ f32a4a40bc635be25d6816da4bd91e9e58c31bf3 -
Linux Linux 5.5 -

II. Public POCs for CVE-2026-93138

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III. Intelligence Information for CVE-2026-93138

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Patches & Fixes for CVE-2026-93138 (8)

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

V. Comments for CVE-2026-93138

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